JP7565477B2 - Simulation system for heat and power facilities - Google Patents

Description

The present invention relates to a simulation system for a heat and power supply facility and a method for operating the heat and power supply facility. More specifically, the present invention relates to a simulation system for a heat and power supply facility and a method for operating the heat and power supply facility, in which a plurality of heat and power supply devices are connected, at least electric power and fuel (hereinafter referred to as "supplied energy") are supplied, and at least two of electric power, low-temperature chilled water, chilled water, hot water, hot water, high-pressure steam, and low-pressure steam (hereinafter referred to as "composite total energy") are produced and supplied to a utilization facility, and the simulation system and method for the heat and power supply facility determine the relationship between the operating conditions of the heat and power supply devices and the amount of supplied energy used or the amount of produced composite total energy.

The following Patent Document 1 is known regarding a simulation system and operation method for a heat and power facility as described above. According to this document, the load factor of the heat and power equipment is changed so that the production amount of any of the composite total energy converges to the target value set by the energy load setting unit, and the balance of at least the composite total energy related to the heat and power equipment is adjusted based on the changed load factor, and an accurate simulation is performed by repeating the change in the load factor of the heat and power equipment and the adjustment until the production amount converges to the target value. This heat and power equipment also includes photovoltaic power generation equipment and solar heat collectors, and it is possible to rationally integrate and use solar-related equipment and other heat and power equipment.

On the other hand, in recent years, the performance of photovoltaic power generation equipment and power storage equipment has improved dramatically, and the combined use of these devices is also increasing. In response to this, there is a growing demand for a system that can accurately simulate thermoelectric facilities including photovoltaic power generation equipment and power storage equipment.

Patent No. 6118973

In view of the current situation, the present invention aims to provide a simulation system for a thermoelectric facility that can rationally integrate and use photovoltaic power generation equipment and power storage equipment with other thermoelectric equipment.

In order to achieve the above-mentioned objective, the simulation system for a heat and power facility according to the present invention is characterized in that, in a heat and power facility in which a plurality of heat and power devices are connected, at least electricity and fuel (hereinafter referred to as "supplied energy") are supplied, and at least two of electricity, low-temperature chilled water, chilled water, hot water, hot water, high-pressure steam, and low-pressure steam (hereinafter referred to as "composite total energy") are produced and supplied to a utilization facility, the system determines the relationship between the operating conditions of the heat and power devices and the amount of supplied energy used or the amount of composite total energy produced, and the heat and power devices include at least a solar power generation device, a power storage device, and a pump using a motor. The system includes an energy load setting unit that includes a heat and power supply device and sets an amount of composite total energy required by a utilization facility for each time period on a daily basis; a process condition setting unit that sets process conditions including at least one of an outside air temperature or a wet bulb temperature of the heat and power supply device and the utilization facility and a horizontal plane solar radiation amount of the photovoltaic power generation device; an operating condition setting unit that sets whether or not to operate and an operating priority order for each of the heat and power supply devices for each time period; and a calculation unit that calculates at least an amount of production of the composite total energy as a result of operating the heat and power supply facility in accordance with the operating conditions of the operating condition setting unit. The operating condition setting unit includes an electricity storage condition setting unit that sets a configuration and charging and discharging conditions of the electricity storage device, and a photovoltaic power generation output condition setting unit that sets an output efficiency of the photovoltaic power generation device and sets an output control of the photovoltaic power generation device to continuous control, wherein any of the thermoelectric devices except the photovoltaic power generation device and the power storage device includes a partial load characteristic that varies depending on the process conditions, and the photovoltaic power generation device has an output characteristic that varies depending on an inclined surface solar radiation based on the horizontal surface solar radiation and an outside air temperature, among the process conditions, and the calculation unit causes a production amount of any of the composite total energies to converge to a target value set by the energy load setting unit in accordance with the output fluctuation of the photovoltaic power generation device in the continuous control and the charge/discharge condition of the power storage device. The load factor of the thermoelectric device is changed as described above, and the balance of the composite total energy related to at least the thermoelectric device is adjusted based on the changed load factor. A convergence calculation is performed to repeat the change in the load factor of the thermoelectric device and the adjustment until the production amount converges to the target value, and the charge amount and discharge amount of the power storage device that make the total charge amount of the power storage device in one day equal to the total discharge amount of the power storage device in one day and maintain the balance of electric energy are obtained for each time period, the charge amount obtained is added to the electric energy usage amount for each time period, and the utility consumption amount is calculated based on the added electric energy usage amount.

According to the above configuration, the thermoelectric device includes at least a photovoltaic power generation device, a power storage device, and a thermoelectric device having at least a pump using a motor. Among the thermoelectric devices, any one except the photovoltaic power generation device and the power storage device includes a partial load characteristic that varies depending on the process conditions, and the photovoltaic power generation device has an output characteristic that varies depending on the amount of inclined solar radiation based on the amount of solar radiation on a horizontal surface and the outside air temperature, which are among the process conditions. In addition, the amount of charge and discharge of the power storage device changes depending on its configuration and charging and discharging conditions. Furthermore, conventional photovoltaic power generation devices could only control the output in units of the number of photovoltaic power generation modules (arrays), which resulted in stepwise output control and required purchasing electricity to make adjustments. However, technological advances have made it possible to control the rated output in units of 1% in photovoltaic power generation devices including power conditioners, etc., making it possible to continuously control the output of photovoltaic power generation, and charging the power storage device has become more efficient. In the present invention, the operating condition setting unit further includes a power storage condition setting unit that sets the configuration of the power storage device and the charge/discharge conditions, and a photovoltaic power generation output condition setting unit that sets the output efficiency of the photovoltaic power generation device and sets the output control of the photovoltaic power generation device to continuous control. This makes it possible to set operating conditions and charge/discharge conditions that are in line with reality in a heat and power generation facility that includes the above-mentioned devices.

Based on the above settings, the calculation unit changes the load factor of the thermoelectric device so that the production amount of any of the composite total energy converges to the target value set by the energy load setting unit in accordance with the output fluctuation of the photovoltaic power generation device and the charge/discharge conditions of the power storage device in continuous control, and adjusts the balance of at least the composite total energy related to the thermoelectric device based on the changed load factor. A convergence calculation is performed in which the load factor of the thermoelectric device is repeatedly changed and adjusted until the production amount converges to the target value, and the charge and discharge amounts of the power storage device are calculated by time period so that the total daily charge amount of the power storage device is equal to the total daily discharge amount of the power storage device and the balance of the power energy can be maintained. Then, the charge and discharge amounts of the power storage device are calculated by time period so that the total daily charge amount of the power storage device is equal to the total daily discharge amount of the power storage device and the balance of the power energy can be maintained. As a result, the output of various thermoelectric devices is adjusted according to the output fluctuation of the photovoltaic power generation device and the charge/discharge conditions of the power storage device in continuous control, and the power balance and the power storage balance are ensured. Since the discharge from the power storage device can be regarded as power generation by the power generation device, the calculated charge amount is added to the amount of power energy used for each time period, and the utility consumption is calculated based on the added amount of power energy used. In this way, it is possible to rationally integrate and use the solar power generation device and power storage device with other thermoelectric devices for simulation.

The charging and discharging conditions include at least an operating method of the power storage device, a charging schedule of the power storage device, and an upper limit value of the received power, and the operating method includes selecting peak cut operation that limits the amount of purchased power so that the received power does not exceed the upper limit value, and the calculation unit may set the amount of power that exceeds the upper limit value as the discharge amount of the power storage device and calculate the charge amount for each time period excluding the time period during which the power storage device discharges based on the discharge amount. Peak cut operation is an operating method in which the purchased power of the heat and power equipment is suppressed to a certain value or less by discharging when the purchased power of the heat and power equipment exceeds a preset purchased power amount. In addition, the power storage device cannot charge and discharge at the same time. Therefore, the calculation unit may set the amount of power that exceeds the upper limit value as the discharge amount of the power storage device and calculate the charge amount for each time period excluding the time period during which the power storage device discharges based on the discharge amount, thereby making it possible to simulate the heat and power equipment even in peak cut operation.

In such a case, the charging schedule may include the charging start time of the power storage device and the maximum possible charging amount per time slot, and the calculation unit may determine the charging end time of the power storage device based on the total discharge amount in one day and the maximum possible charging amount, and may calculate the final charging amount in the time slot including the charging end time. In the above-mentioned peak-cut operation, by setting the charging start time of the power storage device and the maximum possible charging amount per time slot as the charging schedule, and determining the charging end time and the final charging amount based on the total discharge amount in one day and the maximum possible charging amount, it is possible to simulate the heat and power equipment even when setting such a charging schedule.

The charging schedule may include the charging start time and charging end time of the power storage device, and the charge amount for each time slot between these times, and the calculation unit may calculate the charge amount for the charging end time of the power storage device or at least one of the time slots based on the total discharge amount for the day and the charge amount for each time slot. In the above-mentioned peak-cut operation, the charging start time, charging end time, and charge amount for each time slot between these times are set as the charging schedule for the power storage device, and the charge amount for the charging end time of the power storage device or at least one of the time slots is calculated based on the total discharge amount for the day and the charge amount for each time slot, so that it is possible to simulate the heat and power equipment even when setting such a charging schedule.

The charging and discharging conditions include at least an operation method of the storage device, a discharging time period of the storage device, a maximum possible discharge amount for each discharging time period, and a charging schedule for the storage device, and the operation condition setting unit sets an operation priority order for the power generation device including the storage device in a time period including at least the discharging time period, and the operation method selects a scheduled discharge for discharging from the storage device based on the discharging time period and the discharge amount, and the calculation unit calculates the charge amount of the storage device for each time period except the discharging time period based on the charging schedule. Scheduled discharge is an operation method for discharging according to a preset discharge schedule (discharging time period and the discharge amount for that time period). The storage device cannot charge and discharge at the same time. Therefore, by setting an operation priority order for the power generation device including the storage device in a time period including at least the discharging time period and calculating the charge amount of the storage device for each time period except the discharging time period based on the charging schedule, it is possible to simulate, for example, peak shift operation and wholesale electricity market price linked operation. Peak shift operation is an operation that aims to level out purchased power, and basically involves discharging during times when the amount of purchased power is high, and charging during times when the amount of purchased power is low. Wholesale market price linked operation involves discharging during times when the power rate is high, and charging during times when the power rate is low. With the above configuration, it is possible to simulate heat and power equipment even with this type of operation method.

The charging and discharging conditions include at least an operation method of the power storage device, a discharging time period of the power storage device, a maximum possible discharge amount for each discharging time period, and a charging schedule for the power storage device, and the operating condition setting unit further includes a power selling condition setting unit that sets the amount of power sold to be supplied from the heat and power generation facility to the outside and the power selling time period for selling the power, and the operating condition setting unit sets the operating priority of the power generation system equipment including the power storage device in a time period that includes at least the discharging time period, and the operating method includes selecting a scheduled discharge for discharging from the power storage device based on the set discharging time period and the discharge amount, and the calculation unit calculates the discharge amount of the power storage device based on the operating priority period so that the power selling amount is satisfied, and calculates the charge amount of the power storage device for each time period excluding the discharging time period based on the charging schedule. Scheduled discharge is an operating method in which discharge is performed according to a preset discharge schedule (discharging time period and the discharge amount in that time period). In addition, the power storage device cannot be charged and discharged simultaneously. Therefore, by setting the amount of power sold from the heat and power generation facility to the outside and the operation priority of the power generation equipment including the power storage equipment for the time period including at least the discharge time period, and calculating the discharge amount of the power storage equipment based on the operation priority order so that the amount of power sold is satisfied, and calculating the charge amount of the power storage equipment for each time period excluding the discharge time period based on the charge schedule, it becomes possible to simulate VPP (Virtual Power Plant) power generation, for example. This makes it possible to set the VPP supply power to external power (reverse current) for each time period, and consider the amount of power that can be supplied by the VPP for each monthly pattern.

In the above configuration, the combined total energy may be calculated in the order of steam energy before electric energy, and other energies before the steam energy. The thermoelectric device further includes cogeneration, and when the charge amount and discharge amount of the power storage device are calculated by time period and the cogeneration is in partial load operation, the calculation unit performs the convergence calculation again. As described above, the power load may change as a result of calculating the charge amount and discharge amount of the power storage device by time period, which makes the total charge amount of the power storage device equal to the total discharge amount of the power storage device by day and maintains the balance of power energy. In such a case, for example, the cogeneration is in partial load operation due to a change in the power load. Therefore, a more accurate simulation can be performed by performing the convergence calculation again based on the added amount of power energy used.

In any of the above characteristic configurations, the photovoltaic power generation output condition setting unit may further include a connection state selection unit that selects either AC connection or DC connection for the connection between the photovoltaic power generation device and the power storage device, and when DC connection is selected, the output efficiency of the photovoltaic power generation device may be set to 1. As shown in Figures 1c and 1d, the photovoltaic power generation device and the power storage device may be connected in an AC connection in which the photovoltaic power generation power is converted to alternating current (AC) and connected to the power storage device via the AC bus of the heat and power generation facility, or in a DC connection in which the photovoltaic power generation power is directly connected to the power storage device as it is as a direct current (DC). In the AC connection, conversion loss occurs, but in the DC connection, no conversion loss occurs. Therefore, according to the above configuration, simulation is possible regardless of which connection method is selected, and it is also possible to compare them.

In any of the above characteristic configurations, the power storage condition setting unit can set the configuration of the power storage device to be divided into two series, and the calculation unit can regard the two series of power storage devices, in which the charge/discharge amount is distributed so that the state of charge (SOC) of the power storage devices of each series is equal, as one power storage device. In a heat and power supply facility, the power storage device may not only be in one series (one type), but may also be increased by one system, for example, by expansion. With the above configuration, it is possible to simulate even a heat and power supply facility with two series of power storage devices.

Furthermore, in the above configuration, if the conversion efficiency of the DC/AC converters connected to the storage devices of each series is different, the calculation unit may calculate the overall efficiency of the two series of storage devices as a whole during charging and discharging, and use the calculated overall efficiency during charging and discharging to treat the two series of storage devices as a whole as a single storage device. When two series of storage devices are provided, the conversion efficiencies of the DC/AC converters of the storage devices do not necessarily match. According to the above configuration, even if the conversion efficiencies of the DC/AC converters of the storage devices do not match, it is possible to simulate a thermoelectric facility with two series of storage devices.

The features of the heat and power equipment simulation system according to the present invention make it possible to rationally integrate and use photovoltaic power generation equipment and power storage equipment with other heat and power equipment. In addition, simulations of photovoltaic power generation equipment and power storage equipment have become more accurate, making it possible to evaluate the introduction of these equipment, to evaluate their installation in advance, and to simulate efficient installation.

Other objects, configurations and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention.

1 is a general system diagram of a heat and power supply facility that is a target of a simulation system according to the present invention. FIG. 2 is a block diagram of an example of a heat and power supply facility. 1 is a schematic diagram showing a configuration of an electric storage device and a flow of power in a heat and power supply facility in which a photovoltaic power generation device is AC-connected to the electric storage device; 1 is a schematic diagram showing a configuration of an electric storage device and a flow of power in a heat and power supply facility in which a photovoltaic power generation device is DC-connected to the electric storage device; FIG. 2 is a business data flow diagram of the simulation system according to the present invention. FIG. 1 is a diagram showing the hardware configuration of a simulation system according to the present invention. FIG. 2 is a diagram showing the software configuration of the simulation system according to the present invention. FIG. 4 is a flowchart showing a setting procedure of each setting unit. FIG. 4 is a flow chart showing a setting procedure in an operating condition setting unit. FIG. 4 is a diagram illustrating an example of heat and power load data. 1 is a partial load characteristic graph of power generation efficiency, steam yield, and waste hot water yield of equipment performance data of gas engine cogeneration. 1 is a graph showing partial load characteristics of Genelink. FIG. 2 is a schematic diagram illustrating switching selection of power loads. 10A-10C are diagrams showing settings of operating conditions of power generation equipment including power storage equipment, in which (a) shows an example of settings from 8:00 to 18:00, (b) shows an example of settings from 18:00 to 22:00, and (c) shows an example of settings from 22:00 to 8:00. FIG. 1 shows an overall general logic flow. FIG. 1 is a general logic flow diagram for cold and hot water energy balance. FIG. 2 is a general logic flow diagram for low pressure steam energy balance. FIG. 1 is a general logic flow diagram of gas engine exhaust hot water energy balance. FIG. 1 is a general logic flow diagram for hot water energy balance and power energy balance. 1 is a graph showing an example of a time-zone-based power balance during peak-cut operation. 11 is a report showing an example of a time-zone-based power balance during peak-cut operation. 11 is a report showing an example of a time-zone-based charge-discharge balance of an electricity storage device during peak-cut operation. 1 is a graph showing an example of a time-of-day power balance in VPP power generation. 11 is a report showing an example of a time-of-day power balance in VPP power generation. 11 is a report showing an example of a time-zone-based charge-discharge balance of an electricity storage device in VPP power generation. 1 is a graph showing an example of a power balance by time period in peak shift operation in which the power storage device has the first priority. 13 is a report showing an example of a time-zone-based power balance in peak-shift operation in which the power storage device has the first priority. 13 is a report showing an example of a time-zone-based charge-discharge balance of an energy storage device in peak shift operation in which the energy storage device has first priority. 1 is a graph showing an example of a power balance by time period in peak shift operation in which a gas engine has first priority. 13 is a report showing an example of a power balance by time period during peak-shift operation in which a gas engine has first priority. 13 is a report showing an example of a time-zone-based charge-discharge balance of an energy storage device during peak-shift operation in which the gas engine has first priority. 1 is a graph showing an example of a time-of-day power balance in an operation linked to the wholesale power market price with the power storage device given first priority. 13 is a report showing an example of a time-of-day power balance in an operation linked to the wholesale electricity market price with the first priority being given to power storage equipment. 13 is a report showing an example of the time-zone-based charge and discharge balance of an energy storage device in an operation linked to the wholesale electricity market price with the energy storage device being given first priority. 1 is a graph showing an example of a power balance by time period in the case of utilizing surplus solar power generation. 13 is a report showing an example of a time-of-day power balance when utilizing surplus solar power generation. 13 is a report showing an example of the time-zone-based charge-discharge balance of an energy storage device when utilizing surplus solar power generation. FIG. 13 is a diagram illustrating an example of AC connection of two series of power storage devices. FIG. 13 is a diagram showing an example of DC connection of two series of power storage devices.

Next, an embodiment of the present invention will be described with reference to FIGS.
Fig. 1a shows an example of a general system diagram of a heat and power supply facility that is the subject of the present invention. The heat and power supply facility M is composed of multiple heat and power supply devices. As shown in Table 1a below, the heat and power supply facility M shown in Fig. 1 is supplied with steam R (high pressure steam R1 and low pressure steam R2), fossil fuel and other fuels (hereinafter simply referred to as "fuel") R3, electricity R4, cold water R5, and hot water R6, and produces steam S (high pressure steam S1 and low pressure steam S2), cold water S3, 4, hot water S5, 6, hot water S7, and electricity S8, which are supplied to utilization facilities (buildings, factories, district heating and cooling, etc.).

Thermoelectric equipment is roughly classified by system into power generation equipment M100, boiler equipment M200, chilled water equipment M300, hot water equipment M400, low chilled water equipment M500, hot water equipment M600, cooling tower equipment M700 (group cooling tower), heat storage equipment M800, pump equipment M900, and solar power equipment M1000, and the above-mentioned thermoelectric facility is constructed by appropriately combining these. In the present invention, the power storage equipment (SB) M190 is included in the power generation equipment M100. Thermoelectric equipment included in each system M100 to 1000 is listed in Table 1b, for example. Note that Table 1b is merely an example, and it is also possible to provide a low chilled water system electric turbo chiller or a low chilled water system electric heat pump as a low chilled water system equipment so that low chilled water is supplied. Genelink (registered trademark) is a waste hot water input type absorption chiller that effectively uses waste hot water of 100°C or less generated from gas cogeneration (gas engine, fuel cell) to perform cooling. The solar-related equipment M1000 includes a solar power generation equipment M1100 that supplies electricity R4 to other thermoelectric equipment, and a solar heat collector M1200 that supplies solar hot water R7 to solar hot water utilization equipment as other thermoelectric equipment. The solar hot water utilization equipment that receives the supply of solar hot water R7 includes Solar Genelink (solar hot water input type absorption chiller) and/or a solar hot water heat exchanger. In this specification, the heat source equipment refers to thermoelectric equipment excluding power generation equipment including power storage equipment and solar power generation equipment. Each equipment is specified by the energy it receives and the energy it produces and supplies, and is classified by system as described above.

The simulation system 1 is configured as shown in Figure 2a, with multiple user terminals 2 and an administrator terminal 3 connected to a DB server 4 via a network 5. The hardware configuration of the user terminals 2 and administrator terminal 3 is configured as shown in Figure 2b and Table 1c. The hardware of each terminal generally comprises a user interface 6, a CPU 7, etc., and performs processing by running data and programs 7x to 7z.

The user interface 6 includes a monitor 6a, a keyboard 6b, and a mouse 6c, and allows the user to operate buttons and input fields on the display screen described below. The user interface 6 is connected to the CPU 7, temporary storage memory 7b, HDD 7c, network adapter 7d, etc. via a bus 7a, such as a data bus and an address bus. The CPU 7, temporary storage memory 7b, HDD 7c, etc. work together to form a calculation unit 7p, which runs the above data, application programs, etc.

As shown in FIG. 2a, the database group 100 of the DB server 4 (hereinafter, "database" will be abbreviated as "DB") includes an electricity rate DB 101, an environmental load DB 102, and an equipment performance DB 103. The electricity rate DB 101 stores and preserves information related to the price of energy supply, such as electricity rates. The environmental load DB 102 stores environmental load data (unit environmental load) created from various published data. The equipment performance DB 103 stores partial load characteristics of equipment, changes in equipment efficiency due to outside air temperature and wet bulb temperature, internal power consumption, and constraints of equipment incorporated into the system, sorted by model, fuel, and capacity of major manufacturers.

A user of this system accesses the DB server 4 via a network 5 such as TCP/IP, reads the electricity rate data file 101a, the environmental load data file 102a, and the manufacturer/equipment data template file 103a from each of the DBs 101-103, and saves them as read data 100a. By reading these files, it is possible to use data that is not listed in the catalog, data on updated equipment, data on new models, etc.

The electricity rate data and environmental load data can be manually changed to each user's own evaluation data to perform a simulation, and are saved in the case file 106. In this way, the conditions and parameters set in each setting section, which will be described later, can be recorded as a case file in the HDD 7c, which is an electronic recording medium. Note that the electronic recording medium is not limited to the HDD 7c, and various removable disks such as magnetic disks, optical disks, and RAM can also be used as electronic recording media.

In the calculation unit 7p, a processing application 7y and a load creation application 7z run. The load creation application 7z creates a thermoelectric load according to the situation and saves it in the thermoelectric load file 104. Then, by running these, the user can save the simulation data modified to match the energy system to be evaluated as the case file 106 and the thermoelectric load file 104. For evaluation, output can be performed as an output graph, report display 155, simple print 156, and file (table format) 157. The user can read the case file 106 at any time to evaluate the energy saving effect, etc. In addition, any of the thermoelectric devices other than the photovoltaic power generation device and the storage device of the energy system includes a partial load characteristic, and the photovoltaic power generation device has an output characteristic that varies depending on the amount of inclined solar radiation and the outside air temperature described later, and the calculation unit 7p changes the load rate of the thermoelectric device so that the production amount of any of the composite total energy becomes the target value set in the energy load setting unit according to the output characteristic of the photovoltaic power generation device in continuous control and the charge and discharge condition of the storage device, and performs a convergence calculation. The calculation unit 7p also includes a calculation determination unit 7q that determines the number of heat and power devices and changes the number so that the convergence calculation is completed.

For example, if an excessive number of units or an inappropriate type of heat and power equipment is selected in the operating condition setting unit 40, it is possible that the convergence calculation will not converge to the target value. In such a case, the heat source equipment starts up only the number of units that corresponds to the heat load according to the set priority order, and the calculation unit 7p performs the convergence calculation again based on that number of units. The power generation equipment can be processed by purchasing electricity, and is configured not to perform automatic start-up in order to reduce the load of the convergence calculation.

On the other hand, if the capacity of the set heat and power equipment is low or the number of units is small, and it is determined that the calculation result does not reach the target value (for example, the target chilled water load) and the convergence calculation is not completed, the calculation determination unit 7q increases the number of heat source devices with the lowest priority by one and performs the convergence calculation again. This is repeated until the convergence calculation can be completed, and the number is increased to match the load. Here, the heat source device with the lowest priority is usually of low importance in the system configuration of the heat and power equipment, and is considered to have a small impact on the entire heat and power equipment. In addition, since it is only the number of heat source devices with the lowest priority that is increased, recalculation can be easily performed. This allows the simulation to be performed quickly without significantly affecting the entire heat and power equipment.

Figure 1b shows an example of a block flow of the heat and power facility M. This heat and power facility M is composed of a gas engine cogeneration system M150 (hereinafter sometimes referred to as "GE cogeneration", "gas engine cogeneration", or "gas engine"), a low-pressure boiler M220, an absorption chiller M310, a turbo chiller M350, Genelink M380, a solar power generation device M1100, and a power storage device M190. The gas engine cogeneration system M150 is equipped with a waste heat boiler M150a.

The photovoltaic power generation device M1100 (photovoltaic power generation unit) includes a photovoltaic power generation module (array) and a power conditioner M1101 or a DC-DC converter M1102. The photovoltaic power generation device M1100 may be converted to alternating current (AC) as shown in FIG. 1c and connected to the AC bus Ab (AC connection), or may be connected to the storage device M190 as direct current (DC) as shown in FIG. 1d (DC connection). In the case of AC connection, the solar power generation power is supplied (charged) to the storage device M190 via the power conditioner M1101 and the AC bus Ab. Therefore, conversion loss occurs because the power is converted from DC to AC to DC. On the other hand, in the case of DC connection, the solar power generation power is supplied (charged) directly to the storage device M190 via the DC-DC converter M1102, and a part (surplus) is supplied to the AC bus Ab. Therefore, conversion loss is small. In the present invention, the settings of the connection state selection unit 42a described below allow you to switch between AC connection and DC connection for simulation and comparison.

As shown in FIG. 2c, the software configuration of the simulation system 1 according to the present invention is roughly composed of an energy load setting unit 10, a basic condition setting unit 20, a system configuration setting unit 30, an operating condition setting unit 40, an operating result output unit 50, a case file creation unit 60, and a display control unit 70. The DB group 100 is the same as that shown in FIG. 2a.

The basic condition setting unit 20 includes a utility cost setting unit 21, a process condition setting unit 22, an environmental load setting unit 23, and a temperature data setting unit 24. The utility cost setting unit 21 includes an electric power cost setting unit 21a and a fuel cost setting unit 21b. The operating condition setting unit 40 includes an electric power storage condition setting unit 41 that sets the configuration and charge/discharge conditions of the power storage device M190, a photovoltaic power output condition setting unit 42 that sets the output efficiency of the photovoltaic power generation device M1100 and sets the output control of the photovoltaic power generation device M1100 to continuous control, and a power selling condition setting unit 43 that sets the amount of power sold to be supplied from the heat and power generation facility to the outside and the power selling time period for selling the power. Furthermore, the photovoltaic power output condition setting unit 42 further includes a connection state selection unit 42a that selects either AC connection or DC connection for the connection between the photovoltaic power generation device M1100 and the power storage device M190.

FIG. 3a shows the setting procedure for each setting unit of the simulation system.
As shown in Fig. 2c and Fig. 3a, the setting procedure is as follows: first, the energy load is set by the energy load setting unit 10 (S201). Next, the process conditions of the heat medium are set by the process condition setting unit 22 (S202). Then, the environmental load setting unit 23 and the utility cost setting unit 21 set the environmental load data and the utility cost by reading them from the environmental load DB 102 and the power rate DB 101 (S203, 204). After these are set, the system construction setting unit 30 selects the heat and power equipment and reads the equipment performance data to construct the heat and power equipment (S206, 207), and the operation conditions of the constructed heat and power equipment are set by the operation condition setting unit 40 (S208). The construction status of the heat and power equipment is displayed in the flow chart via the display control unit 70 as appropriate. The conditions set in each of the above steps can be appropriately saved by the case file creation unit 60 as individual data 100b such as the user equipment template file 103b, the heat and power load file 104, and the case file 106. Furthermore, in the above steps, various data in the DB group 100 is used for setting, but it is also possible to perform various settings using the stored individual data 100b.

Here, when the heat and power supply facility M includes the power storage device M190 as shown in FIG. 1b, the setting by the operating condition setting unit 40 (S208) is as shown in FIG. 3b, in which the operating conditions of the power storage device M190 are set by the power storage condition setting unit 41 (S2081), and the operating conditions of the other heat and power supply devices are set (S2082), and the calculation unit 7p executes an initial simulation calculation (S2083). Then, the calculation unit 7p calculates the charge and discharge amounts of the power storage device M190 by time period to calculate the charge and discharge balance (S2084), and adds the calculated charge amount to the power energy usage (power load) for each time period (S2085). Then, the utility consumption is calculated and output based on the added power energy usage (power load) (S210). The utility consumption refers to the consumption of the supplied energy required to produce the composite total energy. The supplied energy includes electricity, fuel, and received heat (steam, cold water, hot water, and exhaust hot water).

On the other hand, if it becomes necessary to achieve an energy balance (S2086), the calculation unit 7p executes a time-of-day and/or annual simulation based on these new set conditions and the added amount of power energy usage (S209). The results are output by the operation result output unit 50 in the form of a graph or report as shown in FIG. 9, etc. (S210). It is also possible to change the conditions and perform the simulation repeatedly. In such cases, changes to the operation priority order, whether operation is possible or not, the minimum power purchase amount, the power main, the heat main, etc., and changes to the operating conditions of the storage equipment (S211) are performed in the operating conditions, and addition, modification, and deletion of equipment for comparison (S212) are performed in the system construction settings. Then, the simulation is executed again and output (S209, 210).

Here, a general balance calculation process procedure in the above simulation will be described with reference to Fig. 8. The energy balance step will be abbreviated as "EB" hereinafter.
As shown in the figure, the general processing procedure consists of cold water EB (S01), hot water EB (S02), low pressure steam EB (S03), high pressure steam EB (S04), gas engine exhaust hot water EB (S05), hot water supply EB (S06), and electric power EB (S07). In this way, the composite total energy is calculated in the order of steam energy before electric power energy, and other energies before the steam energy, based on the set conditions at each step above.

In energy load setting (S201), the energy load setting unit 10 sets the amount of combined energy required by the utilization equipment for each time period by month, day, and pattern. For example, as shown in FIG. 4, the outside air temperature, wet bulb temperature, and the chilled water load, steam load, power load, chilled water supply temperature, and chilled water return temperature are set as thermoelectric load data. The outside air temperature is related to the intake air temperature of the gas turbine, and the intake air temperature is a parameter for the gas turbine power generation amount.

The wet bulb temperature affects the cooling water temperature and is a variable in the performance (COP) of absorption chillers and turbo chillers, and is related to power consumption and fossil fuel consumption. In the equipment performance data described below, the cooling water temperature is specified as the wet bulb temperature + an arbitrary temperature, for example +5°C. This outside air temperature and wet bulb temperature are set using data downloaded from the Japan Meteorological Agency website, for example. In addition to the outside air temperature and wet bulb temperature, the temperatures of river water, sea water, sewage and well water, etc. can also be set by month and by time period.

In addition, when the thermoelectric equipment is already in operation, thermoelectric load data such as cold water load, low cold water load, hot water load, low pressure steam, high pressure steam, hot water load, and power load can be set using the thermoelectric load data collected during operation. In addition, this energy load setting can be set with 24-hour data for up to 31 load patterns per month for 12 months, and further, the load for the summer design day and winter design day can be set. Here, the summer design day is the predicted maximum load for cold heat, for example, a load of 15% increase in August. Similarly, the winter design day is the predicted maximum load for warm heat, for example, a load of 15% increase in February. In addition, the supply temperature and return temperature of cold water, low cold water, and hot water can be set in the same way.

Next, in the process condition setting (S202), the process condition setting unit 22 sets the process conditions of the heat medium, such as the basic conditions, fuel data, electric system, steam system, and type of recovered steam from gas engines, gas turbines, fuel cells, etc. This process condition setting unit 22 selects whether to use the temperature difference of the heat medium, the outside air temperature, and the wet bulb temperature of the energy load setting unit 10, and sets the target temperature difference between the supply temperature and the return temperature of the cold water, hot water, and low cold water, and the minimum bypass flow rate. In addition, high pressure/low pressure

Next, in process condition setting (S202), the process condition setting unit 22 sets the process conditions of the heat medium, such as the basic conditions, fuel data, electric system, steam system, and type of recovered steam from gas engines, gas turbines, fuel cells, etc. This process condition setting unit 22 selects whether to use the temperature difference of the heat medium, the outside air temperature, and the wet-bulb temperature of the energy load setting unit 10, and sets the target temperature difference between the supply temperature and return temperature of cold water, hot water, and low cold water, and the minimum bypass flow rate. In addition, it sets the conditions of high-pressure and low-pressure steam (pressure MPaG, steam enthalpy kJ/kg, return water enthalpy kJ/kg, steam recovery rate %).

Here, in the calculation process procedure for steam enthalpy, first the steam pressure is set, and when either saturated steam or superheated steam is selected as the steam type, it is determined whether the steam pressure is superheated steam or saturated steam. If it is saturated steam, the saturated steam enthalpy is calculated from the set pressure, and the calculation result is input as the steam enthalpy. On the other hand, if it is superheated steam, the superheated steam enthalpy is calculated when the superheated steam temperature is input, and the calculation result is input as the steam enthalpy. Note that the high pressure and low pressure steam pressures can be set separately, and the calculation procedure is the same for both.

The fuel process conditions include the heating value and specific gravity of gas, heavy oil, kerosene, other oils, and hydrogen. For the electrical and steam systems, the power load from the thermoelectric load data, the breakdown of the low-pressure steam load, the supply destination of the generated electricity, the type of recovered steam (gas engine, gas turbine, fuel cell, etc.), and the power recovery by steam pressure reduction are set.

The breakdown of the power load in the heat and power load data is determined by selecting whether the power load set by the energy load setting unit 10 is a power load supplied to a facility other than the heat and power equipment, or a power load including the power of the heat and power equipment. By setting a load other than the heat and power equipment, the power load set by the energy load setting unit 10 is set as power supplied to the utilization facility.

Similarly, for the breakdown of the low-pressure steam load in the heat and power load data, select whether the low-pressure steam load is a steam load supplied to equipment other than the heat and power equipment, or a steam load generated by the heat and power equipment. In the case of only supply to equipment other than the heat and power equipment, the set steam load is the steam supplied to the equipment that uses it. In addition, when selecting the total steam load (steam load from the steam generator), this is the case when steam is supplied to the equipment that uses it and is used in the heat and power equipment, and is set as the total flow rate generated from the steam generating equipment. The above-mentioned power load and steam load are used in a simulation, and the results are output to reports, etc.

In addition, power recovery through steam pressure reduction is set for power recovery equipment that can recover power when excess high-pressure steam occurs and is reduced to low-pressure steam. In such cases, the amount of high-pressure steam and the enthalpy of exhaust steam required for maximum power generation and partial load power generation are set.

For each recovered steam type, select whether the steam generated from the power generation equipment (gas engine, gas turbine, and fuel cell) will be low-pressure steam or high-pressure steam. For example, if "low-pressure steam" is selected, it is specified that the steam supply destination from the exhaust heat boiler M150a of the gas engine M150 will be supplied to the low-pressure steam side.

Furthermore, the process condition setting unit 22 sets the horizontal plane solar radiation as a process condition of the solar-related equipment. The horizontal plane solar radiation data includes common data including the latitude, longitude, altitude, and number of consecutive days from New Year's Day of the location where the equipment is installed, as well as hourly data on the data time, temperature, horizontal plane global solar radiation, horizontal plane global solar radiation direct component, horizontal plane global solar radiation sky scattered component, and wind speed. Furthermore, in cold regions, snowfall data may be included. For the hourly data, for example, solar radiation data downloaded from a solar radiation database published by a public institution or the like is used. In addition, the inclination angle (for example, horizontal is 0 degrees) and direction (for example, due south is 0 degrees, westward is positive, and -90 to 90 degrees) of the photovoltaic power generation module (or solar heat collector body) are also set. Since the direction and inclination angle can be set arbitrarily, it is also possible to easily simulate using the direction and inclination angle as parameters. For example, the optimal direction and inclination angle can be considered at the same location.

Then, based on the above horizontal solar radiation data, inclination angle, and direction, the direct solar radiation component, the sky scattered component of the solar radiation on the slope, and the ground reflected component of the solar radiation on the slope are calculated, and the solar radiation on the slope is calculated by adding these together. Details of the calculation are as described in Patent No. 6118973 by the applicant of the present application.

The destination of generated electricity is set to determine where the electricity generated by the power generation equipment will be supplied and used, and can be selected from either sharing the power of both the heat and power usage equipment, sharing the power of only the heat and power usage equipment, or sharing the power of only the usage equipment. For example, if "share of power of the heat and power usage equipment and the consumer (usage equipment)" is selected, electricity will be supplied to both the usage equipment and the heat and power usage equipment. The setting is that electricity will be generated based on the total power, and any shortfall will be purchased.

If you select "Supply to heat and power equipment" as the power supply destination, the power is balanced so that the power generation equipment generates power according to the amount of power consumed by the heat and power equipment. Similarly, if you select "Consumers only," the power is balanced so that the power generation equipment generates power according to the amount of power other than that of the heat source. In other words, the amount of power generated by the power generation equipment changes depending on the supply destination of the generated power.

As shown in FIG. 6, the amount of power consumed by the heat and power equipment M is CE1, the amount of power consumed by the utilization equipment F is CE2, and the amount of power generated by the power generation equipment M100 and the solar power generation equipment M1100 is GEa (GEa1-3). When power is used only by the heat and power equipment M (for example, supply to the turbo chiller M350), if GEa1>CE1, a convergence calculation is performed to prevent reverse power supply. When power is used by both the heat and power equipment M and the utilization equipment F, if GEa2>CE1+CE2, a convergence calculation is performed to prevent reverse power supply. When power is used only by the utilization equipment F, if GEa3>CE2, a convergence calculation is performed to prevent reverse power supply. In other words, the amount of power to be converged will differ. The same is true for steam.

In this way, for power loads, energy can be evaluated by selecting either only the power load used by the utilization equipment or the power load used by both the utilization equipment and the heat and power generation equipment, and for steam loads, energy can be evaluated by selecting either only the steam load used by the utilization equipment or the steam load used by both the utilization equipment and the heat and power generation equipment.

Furthermore, as shown in FIG. 1b, when the thermoelectric power facility M includes a power storage device M190, the power storage device M190 receives power from the AC bus Ab (AC connection) of the thermoelectric power facility M or the solar power generation device M1100 (DC connection) and stores the power. In other words, the amount of power CE1 consumed by the thermoelectric power facility M also includes the charge amount stored by the power storage device M190. Therefore, the amount of power CE1 consumed by the thermoelectric power facility M changes depending on the configuration and charging/discharging conditions of the power storage device M190, and the amount of power to be converged also differs depending on the power storage device M190.

In addition, in the heat and power equipment M of Figure 1b, the basic conditions are set to the target temperature difference of the cold water, the low pressure steam pressure, and its enthalpy. The fuel data is set to the gas lower heating value and specific gravity. The conditions of the electrical system and steam system are set so that the breakdown of the power load is set to only loads other than the heat and power equipment (utilization equipment), and the breakdown of the steam load is set to use other than the heat and power equipment (utilization equipment). The type of recovered steam from the gas engine, etc. is set to low pressure steam.

In the environmental load data setting (S203), the environmental load data setting unit 23 sets the environmental load data. Specifically, the data is set to output the environmental load (primary energy, CO 2 , NOx, SOx) by multiplying the electricity consumption (amount of use) and the fossil fuel and other fuel consumption amounts obtained under the conditions set by the energy load setting unit 10, the basic condition setting unit ₂₀ , the system construction setting unit 30, and the operating condition setting unit 40 by the environmental load data (unit environmental load). The data to be set are the emission intensity and crude oil equivalent value of CO ₂ , NOx, and SOx for electricity, gas, kerosene, heavy oil, other oils, and hydrogen. For electricity, a primary energy equivalent value is further set. Furthermore, electricity can be set by time period, for example, daytime and nighttime.

Next, in utility cost setting (S204), the power cost setting unit 21a and the fuel cost setting unit 21b set the power and fuel costs.

In the system construction setting (S206), the system construction setting unit 30 constructs the system configuration of the heat and power equipment M. This system construction setting unit 30 can arbitrarily set multiple heat and power equipment units of the same model, models with different capacities, models with different energy requirements for operation, or models from different manufacturers, and operate each unit according to the operating conditions of the operating condition setting unit 40.

The performance data of each thermoelectric device is stored in the device performance DB 103 of the DB group 100, and is set by reading this performance data in the device data reading (S207). The device performance DB 103 stores data for each of the above-mentioned device systems, sorted and organized by device, manufacturer, model number, fuel, capacity, and performance. The performance data is read by selecting one of these categories via the system configuration setting unit 30 and the display control unit 70.

The display control unit 70 displays a flow diagram as shown in FIG. 1a, and also constructs a system for the heat and power equipment on the flow diagram. This flow diagram is a diagram in which multiple types of heat and power equipment that can constitute the heat and power equipment M, the supply energy supplied to the heat and power equipment M and received by each heat and power equipment, and the composite total energy produced by the heat and power equipment M and supplied to the utilization equipment are connected and associated with each other by connection lines.

The energy that these thermoelectric devices receive and the energy that they produce and supply are specified according to the type of thermoelectric device. Therefore, it is possible to create a flow diagram of a thermoelectric facility in advance in which each thermoelectric device and the energy received and/or produced by that thermoelectric device are associated and connected with connection lines. The connection lines are assigned to each type of energy received and/or produced.

By selecting a thermoelectric device on the flow diagram as described above, the set thermoelectric device and energy are displayed in a distinguishable manner, so that the relationship between the thermoelectric device and the energy can be visually understood. Therefore, even if you are not a highly skilled expert, you can build a system of thermoelectric equipment M. The solid lines in Figure 1b indicate the internal power of each device M150, M220, M310, M380, etc. In addition, the output characteristics of the solar-related device vary depending on the inclined solar radiation based on the horizontal solar radiation data and the outside air temperature, and the produced power and solar hot water heat amount vary. In addition, the charge and discharge amount change depending on the charge and discharge conditions of the storage device, and the power usage (power load) also changes. This internal power and the output characteristics of the solar-related device and the charge and discharge amount of the storage device are factors that cause changes in the energy balance, and the energy balance is maintained by convergence calculation. The flow diagrams shown in Figures 1a and 1b are merely examples, and can be set as appropriate, and multiple types of flow diagrams may be created and stored in advance.

The heat and power equipment that constitutes the heat and power facility is classified by system and organized by equipment type, so by selecting equipment classified by system as at least the power generation system, boiler system, chilled water system, hot water system, low chilled water system, hot water supply system, and solar power related system, and reading the equipment data, it is considered as equipment selected for that system, and it is possible to set the association between each heat and power equipment and between each heat and power equipment and the combined total energy system and the supplied energy according to the function of each system. As a result, when each equipment is read, it is appropriately connected and can play a role in sharing the load of the balance result of the system. However, the selection of equipment only constitutes the heat and power facility, and the equipment is operated according to the priority order set by the operating condition setting unit 40.

Here, the device performance data of the heat and power supply devices read from the device performance DB 103 as described above will be described.
The equipment performance data of the gas engine cogeneration M150 is determined by a polynomial regression equation, including the power generation efficiency, steam recovery rate, and waste hot water recovery rate at four load factors illustrated in FIG. 5a.

You can also set the minimum load rate, the power consumption of auxiliary equipment, and the loss at startup. For the power consumption of auxiliary equipment, you can set the output percentage at rated load and partial load (operating at 50% load). You can also set the minimum load rate at which the gas engine must be stopped. You can also set how many minutes the energy loss at startup (corresponding to rated operation (load rate 100%)) will be.

In addition, you can set the capacity, number, and fuel of the main engine, the NOx value, the capacity per gas engine, and the blowdown amount from the waste heat boiler, which is used to calculate water consumption. You can also set whether to use the steam and waste heat from the gas engine for external use.

The equipment performance data of the gas engine cogeneration M150 is read by the system construction setting unit 30 by selecting the power generation system, capacity, manufacturer, etc. from the equipment performance DB 103. The data is set by reading this data. The steam generated from the cogeneration waste heat boiler is supplied to the low pressure steam set by the type of gas engine recovery steam in the process condition setting unit 22. The pressure and enthalpy of the generated low pressure steam are set at a low pressure steam pressure of 0.785 MPaG and a low pressure steam enthalpy of 2770.9 kJ/kg set in the process condition setting unit 22. The waste hot water HHW generated from the gas engine M150 is supplied to the waste hot water header H3.

The equipment performance data for the low-pressure boiler M220 sets the thermal efficiency % at multiple arbitrary load factor % of the low-pressure boiler. As above, the blowdown amount, the capacity, number and fuel of the main engine, NOx value, power consumption of the auxiliary equipment and energy loss at startup are also set. As above, the performance data for the low-pressure boiler M220 equipment is also set by reading data. As above, the connection destination of the steam generated from the low-pressure boiler and the pressure and enthalpy of the low-pressure steam are set according to the conditions set in the process condition setting unit 22.

The equipment performance data for the absorption chiller M310 sets the COP during chilled water mode operation at any of a number of partial load rates. By setting these, the relationship between the COP in each mode and the chilled water temperature as parameters is set, as with the regression equation above, and the changing COP%. In addition, the design temperature difference between the chilled water and the chilled water is set. The chilled water temperature can be set to, for example, wet bulb temperature + 5°C by adding any temperature to the outside air wet bulb temperature, river water, and seawater temperature data, and the lower limit at which the equipment can be operated is also set. The CPO and outlet temperature in each mode may also be added as parameters. The same applies to each of the following equipment.

The relationship between the chilled water mode COP and the COP% which changes with cooling water temperature as a parameter, and the relationship between the COP% and the cooling tower capacity with wet-bulb temperature as a parameter are similarly determined using the above regression equation. In addition, the number of main units, design capacity and actual capacity (capacity in the event of deterioration over time, etc.), capacity and power consumption per fan of the auxiliary cooling tower, cooling tower capacity and makeup water concentration ratio of the auxiliary cooling tower are set. The relationship between the outside air wet-bulb temperature and cooling capacity of the auxiliary cooling tower is set using the above regression equation.

Furthermore, the pump power consumption etc. are set. For the pump power consumption, the head of each of the chilled water pump and cooling water pump is set. As the head differs depending on the equipment, it is input manually. Also, the pump flow control method is set to, for example, constant flow rate. Furthermore, the power consumption of the auxiliary equipment of the absorption chiller and the energy loss at start-up are set in the same way as above.

In the pump efficiency calculation process, once the heads are set, the pump efficiency etc. are automatically calculated and set. Note that pump efficiency is used as an example, but motor efficiency is calculated in the same way. In this example, the specific gravity of both the cold water and cooling water is set to 1, since they are both water.

First, the pump capacity is calculated. It is calculated internally from the amount of heat processed by the thermoelectric machine and the temperature difference. The pump efficiency is calculated using the calculated pump capacity. The A efficiency of JIS B8313 is approximated by a cubic logarithm of the pump capacity. Next, the motor shaft power is calculated, and the motor margin is calculated based on the pump shaft power. The pump head is referenced to the value entered above. The motor required power is calculated from the calculated motor margin and motor shaft power. The motor efficiency is calculated based on the calculated motor required power. The motor and pump overall efficiency is then calculated from the calculated motor efficiency and pump efficiency, and the calculation result is set as the pump efficiency. The pump capacity, pump shaft power, and motor required power calculated in the above steps are stored as internal data.

Furthermore, the location where the heat generated by the absorption chiller is to be discharged is set. It is possible to select either the heat discharged from the auxiliary cooling tower or the heat discharged from the group cooling tower. It is also possible to select direct heat discharged from river water/seawater, which is the externally usable water W shown in FIG. 1a, and indirect heat discharged from river water/seawater (through a heat exchanger) instead of the heat discharged from the cooling tower. In addition to river water/seawater, the externally usable water W also includes sewage, well water, and treated sewage water. When river water/seawater is selected, the heat is discharged using the temperature data set by the temperature data setting unit 24 of the basic condition setting unit 20. In the case of direct heat discharge to seawater, seawater is selected and the heat is discharged to seawater under the temperature conditions described and released to the sea. In the case of indirect heat discharge, the water pump M960 in FIG. 1a is added to the heat and power equipment to exchange the heat discharged, and the heat is similarly released to the sea.

When the thermoelectric facility is equipped with a heat pump such as an air-cooled heat pump or an electric heat pump, the heat extraction setting can be performed in the same way. An air-cooled heat pump is a device that extracts heat from the outside air temperature (air) to produce hot water (hot heat). An electric heat pump is a device that can also extract heat from a cooling tower or externally used water W to produce hot water (hot heat). Hot water is used for heating and the load is large in winter, so the COP of an air-cooled heat pump that extracts heat from air with a low outside air temperature is small and the efficiency is low. On the other hand, the externally used water W is higher than the outside air temperature even in winter, so by extracting heat from the externally used water W with an electric heat pump, hot heat can be efficiently produced with a high COP. For example, the heat extraction source of the electric heat pump is set by selecting river water/seawater. The performance data of the absorption chiller M310 is also set by reading the data in the same way as above. The supply of steam, the pressure and enthalpy of the low-pressure steam are the same as above.

The equipment performance data for the turbo chiller M350 is set by setting the capacity and number of the main unit. In addition, the partial load rate and COP during chilled water operation are set, and the relationship between the chilled water COP and the COP% that changes using the chilled water temperature as a parameter is set. The design chilled water temperature difference, chilled water temperature difference, and chilled water temperature are set. These settings are the same as for absorption chillers. The relationship between the chilled water COP and the load rate as a parameter, and the relationship between the chilled water COP and the COP% that changes using the chilled water COP and the chilled water temperature as parameters are also determined by regression equations in the same way. The pump efficiency and heat exhaust destination are also set in the same way as for absorption chillers, and are set by reading in the equipment data.

The equipment performance data for the Genelink M380 includes the relationship between the amount of exhaust heat recovered and the load factor as shown in Figure 5b, and the relationship between the fuel consumption rate and the load factor as shown in the same figure. When the load factor is in the range below point P1, cold water can be produced using only the waste hot water, but when it exceeds that point, the waste hot water is also recovered while consuming fuel.

The equipment performance data of the photovoltaic power generation equipment M1100 includes the type of solar cell panel (e.g., crystalline or amorphous), the total rated output per unit, the solar radiation intensity under standard test conditions, the minimum solar radiation amount that can extract power, the module conversion efficiency, the output efficiency (effective efficiency) of the power conditioner M1101, and the power consumption and rated output. These data are stored in the equipment DB103 and are set by reading them. The number of units and the array installation method (mounting, roof installation, roof integrated type, etc.) are also set. Then, the effective power generation is calculated based on these settings and the slope solar radiation (set slope) based on the horizontal surface solar radiation data of the process condition setting unit 22, the outside air temperature, and the wind speed. In this way, the photovoltaic power generation equipment has output characteristics that vary depending on the slope solar radiation amount, the outside air temperature, and the wind speed. The details of the calculation are as described in Patent No. 6118973 by the applicant of the present application.

The device performance data of the power storage device M190 includes the power storage capacity and the charge/discharge efficiency, and is set, for example, via an input form. The charge/discharge conditions of the power storage device M190 are set by the power storage condition setting unit 41, which will be described later.

The operation condition setting unit 40 sets whether or not to operate each of the heat and power supply devices and/or the operation priority order for each time period for each month, day, and pattern in setting the operation conditions (S208). An operation plan for the heat and power supply devices is created by setting the operation conditions.
As shown in Fig. 7(a) and (b), the daytime operation plan of the power generation equipment and the boiler equipment is set. In this setting screen, the daytime hours (for example, from 8:00 to 22:00) are divided into two arbitrary time slots, and up to the 8th priority is arbitrarily set for each time slot according to the load situation of each time slot. Note that the figure is only one example of the setting, and the number of time slots and the priority that can be set can be increased or decreased as appropriate. For example, it is possible to divide 8:00 to 22:00 into six arbitrary time slots, and set up to the 8th priority for each time slot. In addition, the operation method of the power generation equipment is selected and set to power purchase control operation, maximum power generation operation, or heat main operation (heat load priority). In the figure, the operation of the low pressure boiler and the gas engine cogeneration is set from 8:00 to 18:00, and the operation of the power generation equipment is set to power purchase control operation. In addition, as shown in Fig. 7(c), the operation of the low pressure boiler is also set for the nighttime (for example, from 22:00 to 8:00), and the operation method of the power generation equipment is selected to be power purchase control operation. The item for setting the minimum amount of purchased power specifies the minimum amount of purchased power to be purchased from the power company, and is set to 0 kW in the figure.

The load sharing method of the power generation equipment is selected and set, which specifies the operation control method of multiple power generation equipment. The figure shows an example where "Partial load only for the last equipment" is set. "Partial load only for the last equipment" is set when the power generation amount is adjusted by partial load operation of the equipment specified last in the operation priority order. "All GT/all GE same load operation" and "Last model only uniform load" can also be set. "All GT/all GE same load operation" is set when the power generation amount is adjusted by operating all the set generator gas turbines and gas engines at the same load. "Last model only uniform load" is set when there are multiple equipments specified last in the priority order among multiple generators, and the power generation amount is adjusted by these multiple equipments with the last priority order. In this way, when multiple power generation equipment is set, various generator control methods can be considered. Note that the night time (for example, from 10 p.m. to 8 a.m.) can also be set in the same way as above. The daytime and nighttime time periods can be freely changed, and daylight saving time can also be supported.

Operating conditions are also set for chilled water and hot water equipment. For example, daytime hours (8:00 to 22:00) are arbitrarily divided into four time slots, and up to the 20th priority is set for each time slot depending on the load situation. Note that the number of time slots and priorities set can be increased or decreased as appropriate, as above. In addition to the priorities, the outlet temperature of each device is also set. Low-temperature chilled water equipment can be set in the same way.

As shown in FIG. 1b, when the heat and power supply facility M includes an energy storage device M190, the operating condition setting unit 40 determines the priority of the energy storage device M190 as a type of power generation device with respect to other power generation devices. The time period for setting the operating priority of the energy storage device is a time period that includes at least the time period during which the energy storage device discharges. This is because discharging from the energy storage device can be regarded as equivalent to power generation by the power generation device.

The storage condition setting unit 41 also sets the storage capacity and charge/discharge efficiency as the configuration of the storage device, and the setting method of the operation parameters as the charge/discharge conditions. Furthermore, the storage condition setting unit 41 sets the operation method, minimum storage amount, upper limit of received power during peak cut operation, charge schedule, and discharge schedule as the charge/discharge conditions. Peak cut operation, scheduled discharge, etc. can be selected as the operation method. The charge schedule may set the charging start time and the maximum possible charge amount per time zone, or may set the charge amount for each arbitrary time zone. The discharge schedule sets the maximum possible discharge amount that can be discharged for each arbitrary time zone.

As shown in FIG. 1b, when the heat and power supply facility M includes a photovoltaic power generation device M1100, the operating condition setting unit 40 forcibly prioritizes the photovoltaic power generation device over the power generation device, regardless of the operating conditions (operating order) set by the user as shown in FIG. 7. This applies regardless of the time of day. Since the amount of solar energy supplied cannot be adjusted, the power generated by the solar-related devices is prioritized over other priorities in order to make effective use of the power and absorb its fluctuations.

The photovoltaic power generation output condition setting unit 42 also sets the output control of the photovoltaic power generation device M1100. Here, the output restriction is, for example, a case where a power company requests a photovoltaic power generation operator to suppress (limit) the output of photovoltaic power generation. In particular, when the heat and power generation facility M includes the power storage device M190, the output control of the photovoltaic power generation device is set to continuous control. Conventional output control of photovoltaic power generation devices can only be controlled in units of the number of photovoltaic power generation modules (arrays), resulting in stepwise output control, which required a considerable amount of purchased power for adjustment. However, with the advancement of technology, it has become possible to control the rated output in units of 1% in the power conditioner, and it has become possible to continuously control the output of photovoltaic power generation. In the present invention, the rated output control in units of 1% in the power conditioner is set as the continuous control of photovoltaic power generation. As a result, in the heat and power generation facility M including the power storage device M190, even if the power company imposes a limit on the output of photovoltaic power generation, it is possible to simulate the heat and power generation facility.

Furthermore, the connection state selection unit 42a selects whether the connection between the photovoltaic power generation device and the power storage device is AC connection or DC connection. When DC connection is selected, the output efficiency (effective efficiency) of the power conditioner is set to 1. The DC-DC converter in DC connection is equivalent to the power conditioner in AC connection, and there is almost no conversion loss in the DC-DC converter. This selection makes it easy to perform a comparative simulation between AC connection and DC connection.

The amount of high-pressure steam, low-pressure steam, cold water, hot water, and electricity that can be used from the outside is set. For each amount of intake, multiple arbitrary time periods are set, and the amount of intake for each time period is set. For example, if a maximum of 1 t/h of low-pressure steam is set to be received from the waste incineration facility during the day and night, if the amount of low-pressure steam used by the heat and power equipment is less than 1 t/h, only the amount of steam required for the heat and power equipment is accepted. On the other hand, if the amount of low-pressure steam used by the heat and power equipment is greater than 1 t/h, the maximum of 1 t/h of low-pressure steam is accepted, and the shortage is balanced by the heat and power equipment. The total combined energy amount that can be produced by the heat and power equipment and supplied to other equipment is also set in the same way. These set values are taken into consideration and the supply energy and total combined energy are balanced. High-pressure steam, cold water, hot water, and electricity are all processed in the same way. This allows the operating condition setting unit 40 to set an operating plan for the heat and power equipment while referring to the energy load set by the energy load setting unit 10.

In the heat and power equipment M shown in FIG. 1b, in the example shown in FIG. 7(a) and (b), a gas engine and a low-pressure boiler are set. Furthermore, since the photovoltaic power generation equipment generates electricity by the amount of solar radiation regardless of the time of day or night, when the photovoltaic power generation equipment is incorporated into the heat and power equipment, the photovoltaic power generation equipment is treated as a device with the first priority during the daytime hours, and is treated as a device with priority over power generation equipment. Therefore, the gas engine is given priority after the photovoltaic power generation equipment. In addition, the minimum power purchase amount is set to 0 kW. On the other hand, in the example shown in FIG. 7(c), only the low-pressure boiler is displayed at night, and the photovoltaic power generation equipment is treated as the first priority even during the nighttime hours. The minimum power purchase amount is not set, and the shortage of power is set to be purchased. In addition, the equipment used for cold water and hot water during the day is set to Genelink, absorption chiller, and electric turbo chiller. On the other hand, only the absorption chiller is set at night. These are set for 12 months. Since the heat and power equipment includes a power storage device, the priority can be set between the gas engine and the power storage device at least during the discharge time of the power storage device.

After the operating conditions are set in each of the above steps, a simulation is performed and the results are output. In the output step (S210), the operating result output unit 50 outputs the simulation results by time period and/or as annual calculations. Output formats include graphs and reports.

The results of the power balance, low pressure steam balance, fuel consumption, chilled water balance, number of operating units, metered charges (utility costs), detailed power consumption, and power consumption (utility consumption) can be output as calculation outputs by time period and for the year. It is also possible to output the charge/discharge balance of power storage devices, the amount of power generated by solar power generation, etc.

Here, the operation condition setting by the operation condition setting unit 40 (S208) and the simulation calculation procedure by the calculation unit 7p will be described below with reference to Figs. 2c, 3, 8a-e, and 9. These are composed of steps S01-07 in Fig. 8a, and each step corresponds to Figs. 8b-e. In the following explanations, the power purchase control operation is an operation in which no reverse flow of power occurs, and the maximum power generation operation is an operation in which the power generation equipment is operated at 100% load and allows reverse flow of power. In addition, in explaining each step, only the steps related to the example using the heat and power equipment in Fig. 1b are shown first, and the case of the power purchase control operation in August is illustrated. In this heat and power equipment M, as shown in Fig. 1c, the photovoltaic power generation equipment is AC-connected to the AC bus via a conditioner. When both the photovoltaic power generation equipment and the power storage equipment are included as in this heat and power equipment M, power priority operation is performed, so YES is selected in steps S34 and S72 in Figs. 8c and 8e. Therefore, we will omit the explanation of heat-dominant operation. Details of heat-dominant operation are as described in Patent No. 6118973 by the present applicant.

"Cold water EB (S01, FIG. 8b)"
First, the chilled water heat load and the return temperature difference are read (S11), and the required chilled water flow rate is calculated (S12). Next, the number of chillers that can satisfy both the chilled water heat load and the chilled water flow rate is determined based on the chiller operation priority order (S13), and the operating load factor and COP of each chiller that is operating are calculated (S14). In this calculation, if the chilled water outlet temperature setting is the same, a uniform load factor is used. Then, the cold heat production amount of each chiller that is operating, the consumption of electricity, fuel, and steam, the exhaust heat from the cooling tower, the hot water recovery heat amount of the heat recovery HP, etc. are calculated (S15), and the process proceeds to the hot water energy balance step (S2). The exhaust heat from the cooling tower can also be exhausted to the water for external use as described above.

"Low pressure steam EB (S03, Fig. 8c)"
As shown in the figure, first, the low-pressure process steam heat load is read (S31a), and the amount of low-pressure process steam is calculated (S31b). The amount of low-pressure steam consumption is calculated from the sum of the amount of low-pressure process steam and the amount of low-pressure steam for driving the thermoelectric device (S31c), and it is determined whether the power generation device is in low-pressure steam recovery (S32a). If it is not in low-pressure steam recovery, the number of low-pressure boilers in operation that satisfies the low-pressure boiler load is determined based on the operation priority order of the low-pressure boilers (S33a), the operation load factor of each low-pressure boiler in operation is calculated (partial load factor for only one boiler) (S33b), and the amount of steam production, power and fuel consumption, etc. of each low-pressure boiler in operation are calculated (S33c).

On the other hand, if the power generation equipment is low-pressure steam recovery, the low-pressure boiler load S2 is calculated by subtracting the amount of low-pressure steam received from the amount of low-pressure steam consumed, and the amount of steam generated by the low-pressure boiler, the amount of electricity consumed, the fuel, etc. are calculated (S32b). Here, the amount of low-pressure steam received can also include waste steam received from outside. Then, it is determined whether the operation is power-dominant or heat-dominant (S34).

In the case of power purchase control operation (power priority), the power EB steps S35a to S35f and S71 to S73 surrounded by a dashed line are executed. Note that power EB07 is shown in FIG. 8e, but will be explained here for ease of understanding. The operating devices and the number of operating devices are set from the target power generation amount (S35a), and the power generation equipment other than the power storage equipment is set to the maximum load rate (100%) (S35b). Then, steps S35c to S35f, 71, and 73 are executed, and if the surplus power is within a certain error range (for example, 1 kW) (S73), the process ends and moves to the subsequent steps. Here, the power generation amount in steps S35c and S71 is added to the power generation amount. On the other hand, the charge amount of the power storage equipment is added to the power consumption amount. If the surplus power is not within the error range (S73), the load factor P1 of the power generation equipment is changed as described below, and a convergence calculation is performed in which steps S35c to S35f and 71 to 74 are repeated until the surplus power is within the error range.

Here, we will explain in more detail the convergence calculation of the power purchase control operation using the heat and power equipment M in Figure 1b related to steps S35a to S74. The number of chillers required and the load factor are calculated from the chilled water load and the chilled water temperature difference, and it is decided that there will be one generic M380 and one absorption chiller M310. Then, the required amount of low-pressure steam S2 (t/h) is calculated from the load factor at this time (S32b).

The difference (Ea-W1) kW between the power consumption Ea within the system and the minimum power purchase amount W1 is set as the target power generation amount, and the amount of power generated by the photovoltaic power generation and the amount of discharge of the power storage device are subtracted from this to determine the number of gas engine cogeneration M150 and other operating units (S35a). The power consumption Ea within the system includes the internal power consumption of devices such as M150, M220, M310, M350, M380, and the power load S8. Furthermore, this power load S8 includes the amount of charge of the power storage device. The load rate of the power generation system devices excluding the power storage device such as the gas engine M150 is set to 100% (S35b). Then, the power generation amount G1 (kW/h), the amount of recovered steam S1 (t/h), the internal power consumption, the amount of fuel consumption, etc. of the set gas engine are obtained from the performance curve (S35c).

The amount of recoverable low-pressure steam S1(t) is calculated from the results of this calculation, and S1 and S2 are compared to determine whether excess steam is being generated (S35d). If there is excess steam, it is discarded outside the facility (S35e). If there is a shortage of steam, the low-pressure boiler M220 equivalent to S3(t/h) = S2 - S1 is operated, and the amount of steam generated, internal power consumption, fuel consumption, etc. are calculated (S35f). Then, from the above results, the power consumption Ea within the system, including the amount of charge in the power storage device, is integrated (S71a).

Although not shown, only in the first loop of S35c to S71 and S73, the gas engine cogeneration system determines whether the amount of power generated is insufficient, taking into account the amount of solar power generated Es and the amount of charge and discharge of the power storage device. If G1≦Ea-W1-Es, the system purchases the insufficient power and ends the calculation. On the other hand, if G1>Ea-W1-Es, the system determines whether ABS (G1-(Ea-W1-Es)) is within the allowable error range α. In this embodiment, the allowable error range α is set to within ±1 kW, and if it is within the error range, the calculation ends.

If the allowable error is not within ±1kW, the load factor P1 of the gas engine cogeneration system is changed and the load factor P1 is calculated so that G1 = Ea - W1 - Es. However, if the load factor P1 is changed and the recovered steam volume S1 fluctuates, the internal power consumption will fluctuate with the changes in the operating conditions of the gas engine cogeneration system and other equipment, and the internal system power consumption Ea will also fluctuate, resulting in the original objective of preventing reverse power flow through power purchase control operation not being achieved. Furthermore, the amount of power generated by solar power generation equipment fluctuates depending on the amount of solar radiation on the slope, the outside air temperature, and the wind speed. Therefore, until convergence is achieved in S73, it is necessary to change the load factor P1 in S74 as follows and repeat the convergence calculations from S35c to S71.

The load factor % can be calculated from the target power generation amount, which is created as a quadratic equation using each explanatory variable, and can be obtained as a solution to the quadratic equation. If the power generation amount is smaller than the target power generation amount, the target load factor % is calculated by a convergence calculation using a binary search with Pmin = Pmid. At the same time, the allowable error for the difference between the power generation amount kW at Pmid% and the target power generation amount kW is 1 kW or less. Note that the maximum number of convergence calculations is set to 20 in consideration of cases where convergence is not possible, but the number of convergences can be set appropriately. If convergence is achieved, proceed to the next step (S36a).

The binary search method is merely one example of a convergence calculation method using algebraic equation numerical calculation methods. A convergence calculation method using algebraic equation numerical calculation methods is a numerical calculation of equations that do not include differentials or integrals, such as higher-order algebraic equations, fractional equations, irrational equations, or transcendental equations. Other representative methods that may be used include the Newton-Raphson method, binary search method, Regula-Falcy method, Bairstow-Hitchcock method, Lin method, Bernoulli method, and Greffe method. All convergence calculations in this invention can use each of these methods.

Here, we will explain an example in which "peak cut operation" is selected as the operating method for the charge and discharge conditions of the power storage device. Peak cut operation is an operating method that suppresses the purchased power of the heat and power equipment to a certain value or less by discharging when the purchased power exceeds a preset amount of power. For example, Figures 9a to 9c show graphs and reports for a power storage device configured with a storage capacity of 6,500 kWh and a charge and discharge efficiency of 95%, with the charge and discharge conditions set to an upper limit of received power during peak cut operation of 2,000 kW, a charging schedule with a charging start time of 10 p.m. and a maximum possible charging amount per time slot of 800 kW.

In the example shown in the figure, power consumption is not covered by the amount of power generated by the gas engine alone during the period from 16:00 to 17:00, so power is purchased, but the power storage device is discharged so that the upper limit of the power received (amount of power purchased) does not exceed 2000 kW, and power balance is achieved. During the period from 18:00 to 20:00, all power consumption is covered by purchased power, but power is discharged from the power storage device so that the amount of power purchased does not exceed 2000 kW, and power balance is achieved. In other words, the calculation unit determines the amount of power that exceeds the upper limit of the power received as the amount of discharge from the power storage device. Here, in the charging schedule, the charging start time is set at 22:00 and the charging amount is set to 800 kW, but since the power storage device cannot charge and discharge at the same time, discharging is prioritized. In addition, in the time period from 0:00 to 1:00, the charging amount is less than the set value. This is because it is sufficient to secure a charging amount that corresponds to the total amount of discharge for the day, so the charging amount is adjusted and charging is completed at 1:00. In this way, the calculation unit calculates the charging amount for each time period excluding the time period during which the power storage device discharges based on the above-mentioned discharge amount. Then, the charging end time of the storage device is determined based on the total discharge amount and the maximum possible charging amount for the day, and the final charging amount for the time period including the charging end time is also determined. Note that the values in the graphs and reports are DC-based values, and since the solar power generation device and the storage device in this example are AC-connected, the effective efficiency of the conditioner is taken into consideration during charging and discharging. For example, charging from 10-11pm is 800kW, so 800kW/0.95 (effective efficiency) = 842.1kW from the AC bus. Also, 855.4kW is discharged from the storage device from 6-7pm, so multiplying it by an effective efficiency of 0.95 gives 812.6kW in AC conversion.

In addition, between 7 and 8 am and 11 and 12 noon, solar power generation is relatively high compared to the amount of electricity consumed. Here, solar power generation takes priority (conditions) over the gas engine, which is a power generation device, so partial load operation is performed to suppress the amount of power generated by the gas engine so that no reverse current occurs. This causes the amount of steam generated to change during these times, and a convergence calculation is performed to achieve a steam energy balance.

In this way, the charge and discharge amounts of the storage device are calculated by time period so that the daily charge and discharge amounts of the storage device are equal and the power balance is maintained. Then, by incorporating the charge amount of the storage device into the power load and calculating it, it becomes possible to simulate a heat and power facility equipped with a photovoltaic power generation device and a storage device, and it becomes possible to calculate utility consumption based on the added amount of power energy used.

The relationship between the first solar power generation amount Es + the power generation amount G1 of the gas turbine generator, the required power Ea in the system including the charge amount of the power storage device as described above, and the minimum power purchase amount W1 of the operating condition setting unit 40 is compared. For example, if reverse power is generated between 7:00 and 8:00, this corresponds to G1 + Es > Ea - W1. The load factor of the gas engine generator is sequentially changed to the aforementioned Pmid and a convergence calculation is performed so that the amount of power from the generator and solar power generation is not reversed to the power company as surplus electricity. If G1 + Es < Ea - W, the convergence calculation is completed. In this way, by adjusting the load factor of the cogeneration equipment (gas engine cogeneration M150), it is possible to absorb fluctuations in the power generated by the solar power generation equipment and prevent reverse power flow of the generated power.

Depending on the configuration of the heat and power equipment, other balance calculation steps shown in Figure 8a are performed. The steps other than those mentioned above are described below.

"Hot water EB (S02)"
As shown in Fig. 8b, the hot water heat load and the return temperature difference are read (S21), and the required hot water flow rate is calculated (S22). Next, the hot water heat load and the required hot water flow rate are calculated based on the operation priority order of the hot water system equipment. The number of hot water system devices that are in operation and that satisfy both the hot water flow rate and the hot water temperature is determined (S23), and the operating load factor of each hot water system device that is in operation is calculated (S24). The load factor is a uniform load factor, and the load factor of the heat recovery HP may differ from the others. Then, the amount of heat produced by each hot water system device in operation, the amount of electricity, fuel, and steam consumed, and the amount of heat collected are calculated (S25). The heat is transferred to the low pressure steam EB (S03) described above. It is also possible to extract heat from external water (sea water, river water, etc.).

"High pressure steam EB"
This is omitted from the illustration because it is almost the same except that the "low pressure steam" in the low pressure steam EB in S03 is replaced with "high pressure steam". However, it differs in that the amount of steam that is decompressed in the header and accepted as low pressure steam does not become surplus steam in the previous step S35e. From reference B of the low pressure steam EB (S03), the gas engine exhaust hot water EB (S05) is executed after reference C via high pressure steam EB (S04), the details of which are not shown.

"Gas engine exhaust hot water EB (S05, FIG. 8d)"
First, in the chilled water EB (S01), the number of operating units and the load factor of each chilled water system device are calculated, and the chilled water heat quantity (production amount Ma) A of the waste hot water injection type absorption chiller and the chilled water heat quantity of other chilled water system devices are determined (S13 to S15). In addition, in the hot water EB (S02), the number of operating units and the load factor of each hot water system device are calculated, and the hot water heat quantity B of the hot water recovery heat exchanger is determined (S23 to S25).

Next, it is determined whether the waste hot water injection type absorption chiller is operating (S51a). If it is operating, the amount of waste hot water from the gas engine is calculated, and the amount of cold water heat A' generated by the waste hot water injection type absorption chiller that can be generated with that amount of waste hot water is calculated (S52a). Then, it is determined whether the generated cold water heat A' is insufficient for the previous cold water heat A (S53a), and if it is not insufficient, the process proceeds to S55a. On the other hand, if it is insufficient, the number of operating units and the load rate of other cold water equipment are determined based on the operating priority order of the cold water equipment so that the insufficient cold water heat is produced by other cold water equipment (S54a), and the process proceeds to S55a. The required steam amount S2 of the other cold water equipment and the generated steam amount S1 of the steam generating equipment are calculated (S55a, S56), and it is determined whether the difference between the generated steam amount S1 and the required steam amount S2 is within a predetermined error range α (S57). Note that the unit and value of the error range α differ depending on the energy.

If the difference is not within the error range α, the load rate of the steam generating equipment is changed (S58), and the process returns to step S52a via the path marked SR58a. Steps S52a to S58 are repeated until the cold water heat shortage is resolved and falls within the error range α. That is, the load rate of the steam generating equipment is changed so that the generated steam volume S1 converges to the required steam volume S2, and a convergence calculation is performed to determine the number of operating units of chilled water system equipment and/or the load rate that will achieve a balance between chilled water and steam. If the difference falls within the error range α, the process moves to hot water supply EB (S06).

On the other hand, if the waste hot water injection type absorption chiller is not operating, it is determined whether the hot water recovery heat exchanger is operating (S51b). If the hot water recovery heat exchanger is operating, the procedure is as follows: steps S52b to S58, route SR58b, which are enclosed by a dashed line in the figure. This procedure is the same as for the chilled water equipment described above, and the load rate of the steam generating equipment is changed and a convergence calculation is performed to determine the number of operating hot water equipment and/or the load rate that can balance both hot water and steam. If the hot water recovery heat exchanger is not operating, the procedure moves to hot water supply EB (S06).

"Hot water supply EB (S06, FIG. 8e)"
First, the hot water heat load, hot water supply temperature, and water temperature are read (S61), and the water supply flow rate and the temperature inside the hot water tank are calculated (S62). Next, the operation/stop of the water heaters and the number of units to be operated/stopped are determined based on the temperature inside the hot water tank (S63), and additional water heaters are operated so that the heat storage in the hot water tank is full at the specified time (S64). Then, the amount of heat produced and the amount of electricity and fuel consumed by each operating water heater are calculated (S65), and the process moves to the next power EB (S07).

"Electric power EB (S07)"
Here, after the above-mentioned S71, it is determined whether or not the plant is in power-dominant operation (S72), which is generally the same as that described above for the low-pressure steam EB. If the plant is in heat-dominant operation (S72), the amount of electricity purchased is calculated. If the load factor P1 is reset during power-dominated operation, the process is set to return to the state before S35c of low-pressure steam EB03 (K) for the sake of convenience. , for example, the initial position (K') of the cold water EB01 may be set. The conditions are reset, and the operating conditions of the devices of all the systems are adjusted again, so that the specific composite total energy reaches the target value. It makes sense to converge to this.

Each piece of equipment is incorporated into the equipment model and is operated and calculated according to the operating conditions (load factor) of each piece of equipment, or within the range of the limiting conditions, if any. For example, the amount of recovered waste hot water, gas (fuel), electricity, water usage, and output cold water of a waste hot water absorption chiller operated while taking into consideration the auxiliary power, cold water pump, cooling water pump, and individual cooling tower as related equipment of the waste hot water injection type absorption chiller, and the start-up loss and the lower limit of the operable cooling water temperature as constraints. If the cold water flow rate of the load setting unit is insufficient with one waste hot water injection type absorption chiller, other chillers (e.g., absorption chillers) will start up in the order of chillers set by the operating condition setting unit 40 to balance the amount of cold water. If the cold water balance is still not achieved, the last equipment in the priority order (e.g., turbo chiller) will automatically start up again to balance the amount of cold water.

The steam supplied to the absorption chiller is configured to be supplied from steam generated in the boiler system and power generation system based on the required steam balance. As with the chilled water system, each device in the boiler system and power generation system is modeled, and the amount of rising steam and the amount of power generation are balanced in the order set by the operating condition setting unit 40. If the steam balance cannot be achieved, the boiler system device, which has the last priority, is configured to start up again to balance the steam. The power generation system devices can be processed by purchasing electricity, and are configured not to start up again to reduce the burden of convergence calculations. If surplus power is generated even when the gas engine generator is stopped, the output of the solar power generation device is reduced to achieve power balance.

In this way, the procedure for calculating the system balance is to assemble the thermoelectric balance for each system in order, for example, cold water, hot water, low pressure steam, high pressure steam, hot water supply, and electricity. If any changes occur to the assembled conditions, a convergence calculation is performed using a multivariable algebraic equation numerical analysis method to calculate the thermoelectric balance for all systems. Based on the balance results, the output of each device operated at its load is organized into the required information and output by the operation result output unit 50 as described above. The output is in the form of a graph or report based on the time-of-day output and annual calculation output as described above.

Next, other embodiments of the present invention will be described. The same members as those in the above-described embodiment are denoted by the same reference numerals.
In the above embodiment, the charging schedule for the peak cut operation of the power storage device is set based on the charging start time of the power storage device and the maximum possible charging amount per time slot. However, the setting of the charging schedule is not limited to this, and may be set based on the charging start time and charging end time of the power storage device and the charging amount for each time slot between these times. In such a case, the charging end time of the power storage device or the charging amount in at least one or more time slots is changed based on the total discharge amount for one day and the charging amount for each time slot, so that the total charge amount for one day and the total discharge amount for one day of the power storage device are made equal.

In the above embodiment, the method of operating the power storage device is peak cut operation, but this is not limited to this, and for example, scheduled discharge can also be selected. Scheduled discharge is an operation method in which discharge is performed according to a preset discharge schedule (discharge time period and discharge amount during that time period). In scheduled discharge, the discharge time period of the power storage device, the discharge amount for each discharge time period, and the charging schedule for the power storage device are set. These settings make it possible to simulate, for example, (1) VPP (Virtual Power Plant) power generation, (2) peak shift operation, and (3) operation linked to the wholesale electricity market price.

(1) VPP power generation As an example, Figures 10a to 10c show graphs and reports of the power balance when the configuration of the power storage equipment is set to a storage capacity of 8000 kWh and a charge/discharge efficiency of 95%, and the charge/discharge conditions are set to a charge start time of 8 p.m., a maximum possible charge amount per time slot of 800 kW, and a discharge schedule of a maximum possible discharge amount of 1800 kW from 10 a.m. to 1 p.m. and a maximum possible discharge amount of 2000 kW from 1 p.m. to 4 p.m. In the example in the figures, the two gas engine cogeneration units are given priority over the power storage equipment during the time slot that includes the discharge time slot.

In VVP power generation, the power selling condition setting unit 43 further sets the amount of power selling and the time period during which power is sold from the heat and power generation equipment to the outside (power selling).

For example, the system is set to sell 1000 kW from 10:00 to 13:00 and 1500 kW from 13:00 to 16:00. As shown in Figs. 10a and 10b, during the power selling time period set by the power selling condition setting unit 43, the set amount of power sold is supplied to the outside (power consumption), while the power storage device is discharged based on the discharge schedule so that the power selling condition is satisfied and the power balance is ensured. In the example shown in the figure, 1000 kW of power supply (power sale) is required as VPP power generation from 10:00 to 12:00, but the amount of solar power generation is relatively large compared to the amount of power consumption including the supply power. As in the above embodiment, solar power generation has a higher priority (condition) than the gas engine of the power generation system equipment, so partial load operation is performed to suppress the power generation amount of the gas engine so that reverse flow does not occur. As a result, the amount of steam generation changes during the time period, and convergence calculation is performed so that the steam energy balance is achieved. Note that partial load operation is also performed from 8:00 to 12:00 to suppress the power generation amount of the gas engine so that reverse flow does not occur.

On the other hand, between 12:00 and 16:00, as power consumption increases and there is a power shortage even with solar power generation, the power balance is achieved by discharging from the power storage device. Here, the charging schedule is set to start charging at 20:00 and with a charge amount of 800 kW, but since a power storage device cannot charge and discharge simultaneously, discharging is prioritized. Also, between 0:00 and 1:00, the charge amount is less than the set value. This is because it is sufficient to ensure a charge amount that corresponds to the total discharge amount for the day, so the charge amount is adjusted and charging is completed at 1:00. In this way, the calculation unit calculates the charge amount for each time period excluding the time period during which the power storage device discharges, based on the above-mentioned discharge amount.

In other words, the calculation unit calculates the discharge amount of the power storage device so that the amount of power sold is met, and calculates the charge amount of the power storage device for each time period excluding the discharge time period based on the charging schedule. In this way, the VPP supply power can be set as external power (reverse current) for each time period, and the amount of power that can be supplied by VPP can be considered for each monthly pattern. Then, a quantitative contract can be made with the power company based on the results of this consideration.

(2) Peak shift operation Peak shift operation is an operation that aims to level out the amount of purchased power, and is basically an operation in which power is discharged during time periods when the amount of purchased power is high, and charged during time periods when the amount of purchased power is low. The settings in this case are the same as those described above, and the discharge time periods of the power storage device, the maximum possible discharge amount for each discharge time period, and the charging schedule for the power storage device are set. An operating priority order is set between the power storage device and other power generation devices for a time period that includes at least the set discharge time period. Then, the calculation unit obtains the charge amount of the power storage device for each time period excluding the discharge time period based on the set charge schedule, and balances the power. In this example, a gas engine cogeneration system will be described below as an example of the other power generation device.

In the example shown in Figures 11a to 11c, charging is performed between 10 pm and 7 am according to the set charging schedule, and is added as an electric power load. Then, discharging begins after 8 am according to the set discharge schedule, and the amount of electricity generated by solar power generation also increases. Therefore, if the power storage device is set as the first priority of the power generation devices, the gas engine cogeneration system will operate at 100% from 7 am to 10 am, but since solar power generation is sufficient from 10 am to 3 pm, the gas engine cogeneration system will operate at partial load without purchasing electricity, and the power balance will be achieved. Furthermore, this partial load operation reduces the amount of low-pressure steam and waste hot water generated (supplied), so convergence calculations are performed to balance these energies with other devices.

On the other hand, if the gas engine cogeneration system is set as the first priority (100% load) of the power generation equipment, as shown in the example of Figures 11d-f, solar power generation is sufficient between 10:00 and 12:00, so the gas engine cogeneration system operates at partial load without discharging from the power storage equipment, and power balance is achieved. During other times, the power storage equipment discharges as necessary to match the power load.

(3) Operation linked to the wholesale power market price Some electricity rates are set in conjunction with the wholesale power market price in the wholesale power market. For example, the electricity rate during the daytime when solar power generation is high is set to effectively 0 yen/kWh, and the electricity rate during other times when solar power generation is low is set high. This operation linked to the wholesale power market price is an operation in which electricity is discharged during times when electricity rates are high and charged during times when electricity rates are low, and is similar to peak shift operation that aims to level out purchased electricity. Therefore, in this case, as in the above peak shift operation, the discharge time period of the storage device, the maximum possible discharge amount for each discharge time period, and the charging schedule for the storage device are set.

In the example shown in Fig. 12a to c, 8:00, when solar power generation is high, is set as the charging start time, and charging is performed between 8:00 and 16:00 according to the maximum possible charging amount per time period, and is added as the power load. In addition, since the power rate is set low during this time period, the gas engine cogeneration system is not operated and purchased power is used to reduce running costs. In addition, according to the set discharge schedule, discharge is performed from the storage device during the time periods of 5:00 to 8:00 and 16:00 to 21:00. Therefore, if the storage device is set as the first priority of the power generation system devices, the gas engine cogeneration system is operated at 100% during the time period of 21:00 to 1:00, and the amount of purchased power is minimized. Then, in the time period of 1:00 to 5:00, the gas engine cogeneration system is operated at partial load without purchasing power, following the decrease in the power consumption of the utilization equipment, and the power balance is achieved. Furthermore, because this partial load operation reduces the generation (supply) amount of low-pressure steam and waste hot water, convergence calculations are performed so that these energies are also balanced with other devices. In addition, between 4pm and 9pm, thermal power generation is used instead of solar power generation, which also results in reduced _{CO2 emissions} .

Furthermore, in each of the above embodiments, the power storage device is of one series. However, the simulation can be performed similarly with two series, not just one series. In such a case, the power storage condition setting unit 41 sets the power storage capacity and charge/discharge efficiency of each series. Then, the calculation unit 7p regards the two series of power storage devices, in which the charge/discharge amount is distributed so that the state of charge (SOC) of the power storage devices of each series is equal, as one power storage device. Note that when two series of power storage devices are used, they are connected in parallel and charging/discharging is performed.

The charge rate of an electricity storage device is the remaining (stored) amount of electricity divided by the capacity of the electricity storage device and expressed as a percentage, and can also be expressed as SOC (State Of Charge) or remaining capacity. In the simulations of the present invention, the amount of electricity that the electricity storage device can actually discharge (charge) is set to 100% (fully charged) to 0% (fully discharged). Therefore, for example, if a catalog or technical documentation for an electricity storage device states that it should be used at an SOC of 30% to 80%, this "30% to 80%" corresponds to "0% to 100%" in the present invention.

Furthermore, when the conversion efficiency of the DC/AC converters connected to the storage devices of each series is different, the calculation unit 7p calculates the overall efficiency of the two series of storage devices as a whole during charging and discharging, and uses the calculated overall efficiency during charging and discharging to treat the two series of storage devices as a whole as a single storage device.

As shown in Figure 14a, when a solar power generation equipment is AC-connected to an energy storage equipment, first, assuming that the AC-based discharge amount of the first series of energy storage equipment is P _D1 and the conversion efficiency of the bidirectional DC-AC converter of the first series of energy storage equipment is η _A1 , the DC-based discharge amount of the first series of energy storage equipment is expressed by the following equation 1.

Further, the charge amount P _C1 of the first series power storage device on an AC basis is expressed by the following formula 2.

In order to discharge the two series of power storage devices so that their state of charge (SOC) is equal, the following equation 3 must be satisfied, where the DC-based discharge powers are P' _D1 and P' _D2 [kW] and the storage capacities of the power storage devices are Q _B1 and Q _B2 [kWh].

If the discharge amounts on an AC basis are P _D1 and P _D2 , then the above formula 3 becomes the following formula 4, which is the ratio of discharge powers (P _D2 /P _D1 ).

Therefore, the overall efficiency during discharge can be calculated using the following formula 5.

On the other hand, in order to charge the two series of power storage devices so that their charging rates (SOC) are equal, the following formula 6 must be satisfied, where _P'C1 and _P'C2 are DC-based charging powers [kW] and _QB1 and _QB2 are storage capacities [kWh]. This formula 6 becomes formula 7, which is the ratio of charging efficiencies. The overall efficiency during charging can also be calculated using formula 8, as in the case of discharging.

On the other hand, when the photovoltaic power generation equipment is DC-connected to the power storage equipment as shown in Fig. 14b, the portion of the output _PPV of the DC-DC converter of the photovoltaic power generated, which flows to the power storage equipment, is the charging power _P'C , as given by the following formula 9. Then, the allocation of the photovoltaic power generated at this time is given by the following formula 10. As a result, the overall efficiency can be found even in the case of DC connection of two series.

In the above embodiments, the thermoelectric equipment includes cogeneration as a power generation system equipment. However, it is also possible to simulate the use of surplus solar power generation in a thermoelectric facility that does not include power generation system equipment such as cogeneration, but includes a power storage device, a solar power generation device, and a heat source device.

When simulating the use of surplus solar power, the settings include, for example, the discharge time period of the power storage device, the amount of discharge during each discharge time period, and the charging schedule for the power storage device. In this example, surplus solar power is charged and discharged during the evening hours when power is in short supply.

As shown in FIG. 13a, the charge amount is set for each arbitrary time period as a charging schedule. The amount of surplus solar power generation predicted (simulated) in advance based on the sunshine conditions, etc. is set as the charge amount. As described above, technological advances have made it possible to control the rated output (continuous control) in 1% increments in power conditioners. Therefore, by using the solar power generation condition setting unit 42 to continuously control the output control of the solar power generation device, it becomes possible to simulate the power load taking into account storage and discharge in a heat and power facility M that includes at least a solar power generation device and a storage device.

In this example, as shown in Figures 13b and 13c, the power load is not covered by solar power generation between 8:00 and 10:00, so the power balance is achieved by purchasing power. On the other hand, the power load is covered by solar power generation between 7:00 and 8:00, 10:00 to 13:00, and 14:00 and 15:00, so purchasing power is not necessary. The surplus is then discharged after 16:00, when the unit price of electricity is high, to balance the power load. In this way, by setting the charging schedule taking into account solar radiation forecasts, etc., and assuming a predicted value for the amount of surplus power, it is also possible to simulate operations in which surplus solar power generation is used for charging.

When simulating the use of surplus solar power, the configuration of the heat and power equipment simulation system is as follows:

A simulation system for a heat and power supply facility in which a plurality of heat and power supply devices are connected, at least electric power and fuel (hereinafter referred to as "supply energy") are supplied, and at least two of electric power, low-temperature chilled water, chilled water, hot water, hot water, high-pressure steam, and low-pressure steam (hereinafter referred to as "composite total energy") are produced and supplied to a utilization facility, the simulation system determining a relationship between an operating condition of the heat and power supply device and an amount of supplied energy used or an amount of produced composite total energy, the simulation system comprising:
the thermoelectric device includes at least a solar power generation device, a power storage device, and a thermoelectric device including at least a pump using a motor,
an energy load setting unit that sets the amount of composite total energy required by the utilization equipment for each time period on a daily basis;
a process condition setting unit that sets process conditions including at least one of an outside air temperature or a wet-bulb temperature of the heat and power supply facility and the utilization facility, and a horizontal plane solar radiation amount of the photovoltaic power generation device;
an operation condition setting unit that sets whether or not to operate each of the heat and power supply devices and an operation priority order for each of the heat and power supply devices for each time period;
a calculation unit that calculates at least a usage amount of the supply energy as a result of operating the heat and power supply equipment in accordance with the operating conditions of the operating condition setting unit,
the operating condition setting unit further includes a power storage condition setting unit that sets a configuration of the power storage device and charge/discharge conditions, and a photovoltaic power generation output condition setting unit that sets an output efficiency of the photovoltaic power generation device and sets an output control of the photovoltaic power generation device to continuous control,
any one of the thermoelectric devices other than the solar power generation device and the power storage device includes a partial load characteristic that varies depending on the process condition;
the photovoltaic power generation device has output characteristics that vary depending on an amount of inclined solar radiation based on the amount of solar radiation on a horizontal surface and an outside air temperature, among the process conditions;
The calculation unit is
a load factor of the heat power supply device is changed in accordance with output fluctuations of the photovoltaic power generation device and the charge/discharge conditions of the power storage device during the continuous control so that the amount of production of any of the composite total energies becomes the target value set by the energy load setting unit, thereby calculating the amount of electric power energy used by the heat power supply facility; and determining the charge amount and discharge amount of the power storage device for each time period such that the daily total charge amount of the power storage device and the daily total discharge amount of the power storage device are equal and the balance of electric energy can be maintained;
Adding the obtained charging amount to the amount of electric power energy used for each time period;
A simulation system for heat and power facilities that calculates utility consumption based on the added amount of electrical energy used.

In the above embodiment, the user inputs the panel inclination and orientation of the solar-related equipment, and the amount of inclined solar radiation is calculated based on the input values (eigenvalues). However, for example, in the case of a sun-tracking type solar power generation device, these angles vary by season (month) or time. In that case, instead of the user's input, it is better to calculate the optimal panel inclination and orientation for each month and hour, for example, and calculate the amount of inclined solar radiation based on the calculated values.

The present invention can be used as a simulation system for a heat and power supply facility in which a plurality of heat and power supply devices are connected, at least electric power and fossil fuels are supplied, and electric power, low-temperature cold water, cold water, hot water, hot water, high-pressure steam, and low-pressure steam are produced and supplied to a utilization facility, the heat and power supply facility having at least a solar-related device, and simulating the amount of energy used to produce any of the composite total energy. The present invention can also be used as a system for simulating an environmental load (primary energy, CO 2 , NOx, SOx) by multiplying the electric power consumption, the fossil fuel and other fuel consumption obtained under the conditions of the energy load setting unit, the basic condition setting unit, the system construction setting unit, and the operating condition setting unit, and the unit environmental load of the environmental load data setting unit. Furthermore _, the present invention can be used for operation diagnosis by simulating the current state of the heat and power supply devices, energy saving by changing the operating method, improvement by equipment renewal and its energy saving, evaluation of reduction of environmental load, and consultation on optimal design of the heat and power supply facility.

1: Simulation system, 2: User terminal, 3: Administrator terminal, 4: DB server, 5: Network, 6: User interface, 6a: Monitor, 6b: Keyboard, 6c: Mouse, 7: CPU (calculation means), 7a: Bus, 7b: Temporary storage memory, 7c: HDD, 7d: Network adapter, 7p: Calculation unit, 7q: Calculation judgment unit, 7x: Data file, 7y: Processing application (calculation means), 7z: Load creation application, 10: Energy load setting unit, 20: Basic condition setting unit, 21: Utility cost setting unit, 21 a: power cost setting section, 21b: fuel cost setting section, 22: process condition setting section, 23: environmental load data setting section, 24: temperature data setting section, 30: system configuration setting section, 40: operation condition setting section, 41: power storage condition setting section, 42: photovoltaic power generation output condition setting section, 42a: connection state selection section, 43: power sale condition setting section, 50: operation result output section, 60: case file etc. creation section, 70: display control section, 71: display window, 100: database group, 100a: read data, 110: individual data group, 200: customer database, 201: case file database,
Ab: AC bus, Db: DC bus, F: utilization equipment, M: thermoelectric equipment, M120a: exhaust heat boiler, M190: power storage device, M190a: bidirectional DC/AC converter, M1101: power conditioner, M1102: DC/DC converter

Claims (11)

A simulation system for a heat and power supply facility in which a plurality of heat and power supply devices are connected, at least electric power and fuel (hereinafter referred to as "supply energy") are supplied, and at least two of electric power, low-temperature chilled water, chilled water, hot water, hot water, high-pressure steam, and low-pressure steam (hereinafter referred to as "composite total energy") are produced and supplied to a utilization facility, the simulation system determining a relationship between an operating condition of the heat and power supply device and an amount of supplied energy used or an amount of produced composite total energy, the simulation system comprising:
the thermoelectric device includes at least a solar power generation device, a power storage device, and a thermoelectric device including at least a pump using a motor,
an energy load setting unit that sets the amount of composite total energy required by the utilization equipment for each time period on a daily basis;
a process condition setting unit that sets process conditions including at least one of an outside air temperature or a wet-bulb temperature of the heat and power supply facility and the utilization facility, and a horizontal plane solar radiation amount of the photovoltaic power generation device;
an operation condition setting unit that sets whether or not to operate each of the heat and power supply devices and an operation priority order for each of the heat and power supply devices for each time period;
a calculation unit that calculates at least the amount of combined total energy produced as a result of operating the heat and power supply equipment in accordance with the operating conditions of the operating condition setting unit,
the operating condition setting unit further includes a power storage condition setting unit that sets a configuration of the power storage device and charge/discharge conditions, and a photovoltaic power generation output condition setting unit that sets an output efficiency of the photovoltaic power generation device and sets an output control of the photovoltaic power generation device to continuous control,
any one of the thermoelectric devices other than the solar power generation device and the power storage device includes a partial load characteristic that varies depending on the process condition;
the photovoltaic power generation device has output characteristics that vary depending on an amount of inclined solar radiation based on the amount of solar radiation on a horizontal surface and an outside air temperature, among the process conditions;
The calculation unit is
a load factor of the thermoelectric power device is changed in accordance with output fluctuations of the photovoltaic power generation device and the charge/discharge conditions of the power storage device during the continuous control so that the production amount of any of the composite total energies converges to a target value set by the energy load setting unit, and a balance of at least the composite total energy related to the thermoelectric power device is adjusted based on the changed load factor; a convergence calculation is performed in which the change in the load factor of the thermoelectric power device and the adjustment are repeated until the production amount converges to the target value, and a charge amount and a discharge amount of the power storage device are obtained for each time period so that a daily total charge amount of the power storage device and a daily total discharge amount of the power storage device become equal and a balance of electric energy can be maintained;
Adding the obtained charging amount to the amount of electric power energy used for each time period;
A simulation system for heat and power facilities that calculates utility consumption based on the added amount of electrical energy used. The simulation system for heat and power facilities according to claim 1, wherein the charging and discharging conditions include at least an operating method for the power storage device, a charging schedule for the power storage device, and an upper limit value for the received power, and the operating method includes selecting peak cut operation that limits the amount of purchased power so that the received power does not exceed the upper limit value, and the calculation unit determines the amount of power that exceeds the upper limit value as the discharge amount of the power storage device, and calculates the charge amount for each time period excluding the time period during which the power storage device discharges based on the discharge amount. The simulation system for heat and power facilities according to claim 2, wherein the charging schedule includes a charging start time of the power storage device and a maximum possible charging amount per time period, and the calculation unit determines a charging end time of the power storage device based on the total discharge amount in one day and the maximum possible charging amount, and calculates a final charging amount in a time period including the charging end time. The simulation system for heat and power facilities according to claim 2, wherein the charging schedule includes a charging start time, a charging end time, and a charging amount for each time period between these times for the storage device, and the calculation unit determines the charging end time of the storage device or the charging amount for at least one of the time periods based on the total discharge amount for the day and the charging amount for each time period. The simulation system for heat and power facilities according to claim 1, wherein the charging and discharging conditions include at least an operation method for the power storage device, a discharging time period for the power storage device, a maximum possible discharge amount for each of the discharging time periods, and a charging schedule for the power storage device, the operation condition setting unit sets an operation priority order for power generation devices including the power storage device during a time period that includes at least the discharging time periods, the operation method includes selecting a scheduled discharge for discharging from the power storage device based on the discharging time periods and the discharge amount, and the calculation unit calculates the charge amount of the power storage device for each time period excluding the discharging time periods based on the charging schedule. The charge and discharge conditions include at least an operation method of the power storage device, a discharge time period of the power storage device, a maximum possible discharge amount for each discharge time period, and a charging schedule for the power storage device. The operation condition setting unit further includes a power selling condition setting unit that sets the amount of power sold to be supplied from the heat and power supply facility to the outside and the power selling time period for selling the power. The operation condition setting unit sets the operation priority of the power generation system devices including the power storage device in a time period that includes at least the discharge time period. The operation method includes selecting a scheduled discharge for discharging from the power storage device based on the set discharge time period and the discharge amount. The calculation unit calculates the discharge amount of the power storage device based on the operation priority so that the power selling amount is satisfied, and calculates the charge amount of the power storage device for each time period excluding the discharge time period based on the charge schedule. The simulation system for heat and power supply facilities described in claim 1. The simulation system for heat and power facilities according to claim 1, in which the composite total energy is calculated in the following order: steam energy before electric power energy, and other energies before the steam energy. The thermoelectric device further includes a cogeneration device;
8. The heat and power supply facility simulation system according to claim 7, wherein when the cogeneration system is in partial load operation as a result of determining the charge amount and discharge amount of the power storage device by time period, the calculation unit performs the convergence calculation again. The simulation system for a heat and power facility according to any one of claims 1 to 8, wherein the photovoltaic power generation output condition setting unit further has a connection state selection unit that selects either an AC connection or a DC connection for the connection between the photovoltaic power generation device and the power storage device, and when a DC connection is selected, the output efficiency of the photovoltaic power generation device is set to 1. The simulation system for heat and power facilities according to any one of claims 1 to 8, in which the power storage condition setting unit can set the configuration of the power storage device to be divided into two series, and the calculation unit regards the power storage devices of the two series as one power storage device, in which the charge and discharge amounts are distributed so that the state of charge (SOC) of the power storage devices of each series is equal. The simulation system for heat and power facilities according to claim 10, wherein when the conversion efficiency of the DC/AC converters connected to the storage devices of each series is different, the calculation unit calculates the overall efficiency of the two series of storage devices as a whole during charging and discharging, and regards the two series of storage devices as a whole as a single storage device using the calculated overall efficiency during charging and discharging.

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