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WO2018236038A1 - Système de stockage d'énergie - Google Patents

Système de stockage d'énergie Download PDF

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Publication number
WO2018236038A1
WO2018236038A1 PCT/KR2018/004591 KR2018004591W WO2018236038A1 WO 2018236038 A1 WO2018236038 A1 WO 2018236038A1 KR 2018004591 W KR2018004591 W KR 2018004591W WO 2018236038 A1 WO2018236038 A1 WO 2018236038A1
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WO
WIPO (PCT)
Prior art keywords
value
power
command value
time point
battery
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Ceased
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PCT/KR2018/004591
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English (en)
Korean (ko)
Inventor
이일화
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LS Electric Co Ltd
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LSIS Co Ltd
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Publication date
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/14—Energy storage units
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Definitions

  • the present invention relates to an energy storage system for stabilizing the output power of a distributed power system.
  • Energy Storage System is a system that stores generated power in each link system including power plant, substation and transmission line, and then uses energy selectively and efficiently at necessary time to enhance energy efficiency.
  • the energy storage system can reduce the power generation cost when the overall load ratio is improved by leveling the electric load with large time and seasonal variation, and it is possible to reduce the investment cost and the operation cost required for the electric power facility expansion, can do.
  • Energy storage systems are divided into physical energy storage and chemical energy storage depending on the storage method.
  • Physical energy storage includes pumped storage, compressed air storage, and flywheel.
  • Chemical storage includes lithium ion batteries, lead acid batteries, and Nas batteries.
  • the output power amount may fluctuate depending on the amount of air that changes from time to time, and in the case of the solar power generation system, the output power amount may fluctuate due to the amount of clouds or the like.
  • the instability of the system is increasing due to the irregularly changing output of renewable energy system due to this weather change, and the collapse of the system can also be caused by the peak power generation amount of the large installed renewable energy system.
  • an energy storage system has recently emerged that minimizes the instability of the system and smoothes the output of the renewable energy system based on the charge / discharge of the battery, in order to deal with the generation amount exceeding the systematic limit value.
  • An object of the present invention is to provide an energy storage system capable of stabilizing the output power of a distributed power supply system by reducing the rate of change of output power (i.e., power supplied to the system) of the distributed power supply system through battery charging and discharging.
  • an energy storage system is an energy storage system connected to a grid and a distributed power supply system.
  • the energy storage system includes a power condition system (PCS) And a host controller for generating a command value for controlling charging and discharging of the battery on the basis of the power value developed in the battery and the distributed power source system and providing the generated command value to the PCS,
  • a reference value calculation unit for calculating a reference value based on a power value developed in the distributed power source system at a point in time and a power value charged and discharged by the battery and a reference value calculation unit for calculating an upper limit value and a lower limit value of the combined power target value of the distributed power source system and the battery based on the calculated reference value
  • a power value of the distributed power system measured at a second point in time after the first point of time As synthesizing power target value is greater than the lower limit value it includes an upper limit value than the reference value generating unit for generating a command value to a smaller value.
  • the command value generator generates a charge command value related to charging of the battery among the command values when the power value of the distributed power source system measured at the second time point is equal to or greater than the upper limit value and the power value of the distributed power source system measured at the second time point is And generates a discharge command value related to the discharge of the battery among the command values when it is equal to or lower than the lower limit value.
  • the command value generating unit calculates a first result value, which is a difference between the power value and the upper limit value of the distributed power system measured at the second time point, A difference between the power value and the lower limit value of the distributed power supply system, and generates a charging command value such that the power value charged in the battery becomes a value between the first resultant value and the second resultant value.
  • the command value generator calculates the command value at the second point in time based on the first result value, which is the difference between the power value and the upper limit value, And a discharge command value is generated such that a power value discharged from the battery is a value between a first resultant value and a second resultant value.
  • the PCS can control the SOC (State of Charge) of the battery within a preset stable range based on a command value provided from the host controller.
  • SOC State of Charge
  • the host controller is a PMS (Power Management System) or an EMS (Energy Management System).
  • the reference value calculator updates the reference value every predetermined period
  • the upper and lower limit value calculator updates the upper limit value and the lower limit value of the combined power target value based on the updated reference value every predetermined period.
  • an energy storage system connected to a grid and a distributed power supply system.
  • the energy storage system includes a distributed power supply system and a power condition system (PCS) And a host controller for generating a command value for controlling charging and discharging of the battery on the basis of the power value developed in the battery and the distributed power source system and providing the generated command value to the PCS,
  • a reference value calculation unit for calculating a reference value based on a power value developed in the distributed power source system at a point in time and a power value charged and discharged by the battery and a reference value calculation unit for calculating an upper limit value and a lower limit value of the combined power target value of the distributed power source system and the battery based on the calculated reference value
  • an upper limit value setting unit for setting the upper limit value setting unit and the lower limit value setting unit, Calculating a slope based on the power generation value of the stem, and the combined power target value is included between the upper and lower limit value of the command value generating section for generating a command value such
  • the command value generator calculates a predicted power value of the distributed power system at a third time point after the second time point based on the power generation slope when the power generation amount slope is an increasing slope and generates a command based on the calculated estimated power value of the distributed power system And calculates a predicted power value of the distributed power system at a third time point after the second time point based on the power generation amount slope when the power generation amount slope is a decrease slope, Based on the estimated power value of the system, a discharge command value associated with discharge of the battery among the command values is generated.
  • the command value generator calculates a first result value which is a difference value between the power value and the upper limit value measured at the third time point, And generates a charging command value such that the electric power value to be charged is equal to or greater than the first resultant value.
  • the command value generator calculates a second result value, which is a difference value between the power value and the lower limit value measured at the third time point, And generates a discharge command value such that the discharged electric power value is equal to or greater than the second resultant value.
  • the time difference between the first time and the second time is a first time
  • the time difference between the second time and the third time is N times the first time
  • N is a natural number of 2 or more.
  • an energy storage system connected to a grid and a distributed power supply system.
  • the energy storage system includes a distributed power supply system and a power condition system (PCS) And a host controller for generating a final command value for controlling charging and discharging of the battery on the basis of the battery power charged and discharged by the PCS and the power value developed in the distributed power source system and providing the generated final command value to the PCS,
  • a reference value calculation unit for calculating a reference value based on a power value generated in the distributed power system at the first time point and a power value charged and discharged by the battery, and a reference value calculation unit for calculating an upper limit value And a lower limit value setting unit for setting a lower limit value
  • a command value generator for generating an initial command value so that the combined power target value becomes a lower limit value or an upper limit value based on the power value of the system; and a command value generator for correcting the initial command value so that the combined power target value is larger than the lower limit value and smaller than the upper
  • the command value generating unit generates an initial charge command value related to charging of the battery among the initial command values when the power value of the distributed power source system measured at the second time point is equal to or greater than the upper limit value, The initial discharge command value related to the discharge of the battery among the initial command values is generated.
  • the command value generator calculates a first result value that is a difference between a power value and an upper limit value of the distributed power system measured at the second time point when the power value of the distributed power source system measured at the second time point is equal to or greater than the upper limit value, And generates an initial charge command value based on the resultant value.
  • the command value correcting unit generates a final charge command value related to charging of the battery among the final command values based on the initial charge command value supplied from the command value generator so that the power value charged by the battery is greater than the first result value .
  • the command value generator calculates a second result value that is a difference value between the power value and the lower limit value of the distributed power system measured at the second time point when the power value of the distributed power source system measured at the second time point is less than the lower limit value, And generates an initial discharge command value based on the resultant value.
  • the command value correcting unit generates a final discharge command value related to the discharge of the battery among the final command values so that the power value discharged from the battery is greater than the second result value based on the initial discharge command value supplied from the command value generator .
  • the output power of the distributed power supply system can be stabilized by reducing the rate of change of the output power (that is, the power supplied to the system) of the distributed power system through the battery charge / discharge, The instability can be reduced.
  • the output power of the distributed power supply system is stabilized by reducing the rate of change of the output power, not the smoothing of the output power of the distributed power supply system, so that the capacity of the battery can be reduced. Also, by reducing the capacity of the battery, the battery cost can be reduced.
  • FIG. 1 is a view illustrating an energy storage system according to an embodiment of the present invention.
  • FIG. 2 is a view for explaining the PMS of FIG.
  • 3 and 4 are graphs illustrating the process of stabilizing the output power of the distributed power system.
  • FIG. 5 is a graph illustrating an example of a method by which the energy storage system of Fig. 1 stabilizes the output power of a distributed power system.
  • Figures 6 and 7 are graphs illustrating another example of a method by which the energy storage system of Figure 1 stabilizes the output power of a distributed power system.
  • Figs. 8 and 9 are graphs illustrating another example of a method by which the energy storage system of Fig. 1 stabilizes the output power of a distributed power system.
  • Fig. 8 and 9 are graphs illustrating another example of a method by which the energy storage system of Fig. 1 stabilizes the output power of a distributed power system.
  • FIG. 10 is a graph illustrating another example of a method by which the energy storage system of FIG. 1 stabilizes the output power of a distributed power system;
  • FIG. 1 is a view illustrating an energy storage system according to an embodiment of the present invention.
  • 2 is a view for explaining the PMS of FIG. 3 and 4 are graphs illustrating the process of stabilizing the output power of the distributed power system.
  • an energy storage system 1 includes a PCS 100, a battery 110, a BMS 120, a PMS 130, Management System), and an EMS 140 (Energy Management System).
  • the PCS 100 can manage the power of the grid (GRID) and the distributed power system (DG).
  • GRID grid
  • DG distributed power system
  • the PCS 100 can store the power generated in the distributed power system DG in the battery 110 or transfer it to the grid (GRID) and the load (L). Also, the PCS 100 may transmit the power stored in the battery 110 to the grid (GRID) or the load (L). The PCS 100 may store the power supplied from the grid (GRID) in the battery 110.
  • the PCS 100 can also control the charging / discharging (i.e., charging or discharging) of the battery 110 based on the state of charge (hereinafter referred to as " SOC level ") of the battery 110 .
  • &quot state of charge
  • the PCS 100 can control the charging / discharging of the battery 110 based on the command value supplied from the PMS 130.
  • the PCS 100 generates a schedule for the operation of the energy storage system 2 based on the power price of the power market, the power generation demand of the distributed power system (DG), the power generation amount and the grid (GRID) can do.
  • DG distributed power system
  • GRID grid
  • the battery 110 may be charged and discharged by the PCS 100.
  • the battery 110 may receive and store at least one of the power of the distributed power system DG and the grid GRID, and may supply the stored power to at least one of the grid (GRID) and the load L .
  • the battery 110 may include at least one battery cell, and each battery cell may include a plurality of bare cells.
  • DG distributed power system
  • GRID grid
  • DGs distributed power systems
  • DG distributed power system
  • a distributed power system can be a renewable power generation system using renewable energy such as solar power generation system, wind power generation system, and tidal power generation system.
  • the grid may include power plants, substations, transmission lines, and the like. This grid GRID may supply power to one or more of the energy storage system 1, the load L and the distributed power supply system DG and may be connected to one or more of the distributed power system DG and the energy storage system 1 Power may be supplied from the power source.
  • the load L is supplied with power from at least one of the distributed power system DG, the battery 110, and the grid GRID, and consumes the supplied power.
  • the load L may include a home, a large building, a factory, and the like.
  • the BMS 120 can monitor the state of the battery 110 and control the charging and discharging operations of the battery 110. [ The BMS 120 may also monitor the state of the battery 110 including the SOC level of the battery 110 in a charged state and may monitor the state of the monitored battery 110 (e.g., voltage, current, Power consumption, life span, charge state, etc.) information to the PCS 100.
  • the state of the battery 110 e.g., voltage, current, Power consumption, life span, charge state, etc.
  • the BMS 120 may perform a protection operation for protecting the battery 110.
  • the BMS 120 may perform at least one of an overcharge protection function, an over discharge protection function, an over current protection function, an over voltage protection function, an overheat protection function, and a cell balancing function for the battery 110.
  • the BMS 120 may adjust the SOC level of the battery 110.
  • the BMS 120 receives the control signal from the PCS 100 and can adjust the SOC level of the battery 110 based on the received signal.
  • the PMS 130 may control the PCS 100 based on data associated with the battery 110 provided by the BMS 120.
  • the PMS 130 may monitor the status of the battery 110 and monitor the status of the PCS 100.
  • the PMS 130 can control the PCS 100 according to the efficiency based on the data related to the battery 110 received from the BMS 120.
  • the PMS 130 may also monitor the status of the battery 110 through the BMS 120 and provide the collected data to the EMS 140.
  • the PMS 130 may be an upper controller, and the host controller 130 controls the charging / discharging of the battery 110 based on the power value developed in the distributed power system DG And provide the generated command value to the PCS 100.
  • the command value may be provided to the PCS 100.
  • the PMS 130 may include a reference value calculation unit 132, an upper / lower limit value setting unit 134, and a command value generation unit 136.
  • the reference value calculation unit 132 calculates a reference value Can be calculated.
  • the reference value calculation unit 132 receives the generated power values and the charged and discharged power values at a specific point in time from the distributed power system DG and the battery 110, respectively, and calculates a reference value based on the generated power value and the charged / The combined power value can be calculated.
  • the composite power value may be a reference value.
  • the synthesized power values (e.g., MV1 and MV2) calculated for each period can be calculated based on the combined power (for example, As shown in FIG.
  • the upper and lower limit value setting unit 134 can set the upper limit value TARGETMAX and the lower limit value TARGETMIN of the combined power target value of the distributed power supply system DG and the battery 110 based on the calculated reference value.
  • the combined power target value of the distributed power system DG and the battery 110 means a target value of the output power expected when the charge and discharge of the battery 110 is applied to the power generated in the distributed power system DG can do.
  • the upper and lower limit value setting unit 134 can receive the reference value from the reference value calculating unit 132 and set the upper limit value TARGET MAX and the lower limit value TARGET MIN of the combined power target value on the basis of the supplied reference value .
  • the upper limit value TARGETMAX and the lower limit value TARGETMIN of the combined power target value can also be newly set every predetermined period.
  • the upper limit value TARGET MAX may be a value obtained by adding a% (for example, a is a positive number) of the maximum output value (i.e., peak value) of the distributed power supply system DG to a reference value calculated every predetermined period .
  • the lower limit value TARGET MIN may be a value obtained by subtracting a% (for example, a is a positive number) of the maximum output value (i.e., the peak value) of the distributed power supply system DG from a reference value calculated every predetermined period.
  • the upper limit value TARGET MAX may be XKW + 250 KW, (TARGET MIN) may be XKW-250KW.
  • the command value generation unit 136 Based on the power value of the distributed power system (DG) measured at a second time point after the first time point (for example, any time point between 11:59 and 12:00), the command value generation unit 136 generates a command value
  • the command value can be generated such that the power target value is included in the variation limit range (lower limit value to upper limit value).
  • the command value may include a charge command value associated with charging of the battery 110 and a discharge command value associated with discharge of the battery 110.
  • command value generator 136 can provide the generated command value to the PCS (100 in Fig. 1).
  • the PCS (100 in FIG. 1) can control the charge / discharge of the battery (110 in FIG. 1) based on the command value supplied from the command value generator 136 so that the combined power does not deviate from the variation limit range.
  • the PMS 130 may further include a command value correcting unit (not shown) according to the output stabilization method of the distributed power system DG. A detailed description thereof will be given later.
  • the EMS 140 generates information on the maintenance and repair of the battery 110 based on data on the battery 110 provided from the PMS 130, To the BMS 120 via the PMS 130.
  • the EMS 140 may perform the above-described command value generation function as an upper controller.
  • the present invention will be described by taking as an example a case where the PMS 130 is a host controller.
  • the switch SW may be disposed between the grid GRID and the PCS 100 and may be opened when a power failure of the grid GRID is detected and may be closed when the power grid GRID is detected .
  • FIG. 5 is a graph illustrating an example of a method by which the energy storage system of Fig. 1 stabilizes the output power of a distributed power system.
  • the reference value calculator 132 calculates the power value developed at the distributed power system DG at the first time point P1,
  • the reference value MV1 can be calculated on the basis of the power value charged / discharged by the power supply (110 in Fig. 1).
  • the reference values MV1 and MV2 may be updated every predetermined period (for example, intervals between P1 and P6, i.e., one minute).
  • the upper / lower limit value setting unit 134 sets the upper limit value TARGET MAX1 of the combined power target value of the distributed power supply system DG and the battery (110 in Fig. 1)
  • the lower limit value (TARGET MIN1) can be set.
  • the upper limit value of the combined power target value may be a value obtained by adding a% (for example, a is a positive number) of the maximum output value of the distributed power system DG to a reference value updated every predetermined period.
  • the lower limit value of the combined power target value may be a value obtained by subtracting a% (for example, a is a positive number) of the maximum output value of the distributed power system DG from a reference value updated every predetermined period.
  • the upper limit value and the lower limit value of the combined power target value can be updated based on the updated reference value every predetermined period.
  • the command value generator 136 When the upper limit value TARGET MAX1 and the lower limit value TARGET MIN1 of the combined power target value are set, the command value generator 136 generates a command value at the next time point after the first time point P1 (for example, at the second time point P2) The command value can be generated such that the combined power target value is the lower limit value TARGET MIN1 or the upper limit value TARGET MAX1, based on the power value of the distributed power supply system DG measured in the power control mode.
  • the command value generator 136 generates a command value (e.g., a command value) from the battery (110 in FIG. 1) when the power value of the distributed power system DG measured at a specific point in time exceeds the upper limit value TARGET MAX1. And generates a discharge command value associated with the discharge of the battery (110 in FIG. 1) when the power value of the distributed power system DG measured at a specific point in time is less than the lower limit value TARGET MIN1 .
  • a command value e.g., a command value
  • the command value generator 136 calculates the command value of the power value of the distributed power system DG
  • a first result value that is a difference value of the upper limit value TARGET MAX1 may be calculated and a charge command value may be generated such that the power value charged to the battery 110 (FIG. 1) becomes the first resultant value.
  • the command value generator 136 outputs the power value of the distributed power system DG measured at the specific point in time and the lower limit value (TARGET MIN1), and generate a discharge command value such that the power value discharged from the battery (110 in FIG. 1) becomes the second resultant value.
  • the command value generation unit 136 may provide the PCS 100 with a charging command value or a discharge command value generated through the above process and the PCS 100 may generate the charging command value or the discharge command value based on the supplied charging command value or the discharge command value
  • the battery (110 in Fig. 1) can be charged and discharged.
  • the command value generator 136 when the power value of the distributed power system DG is measured to be less than the lower limit value TARGET MIN1 at the second time point P2, the command value generator 136 generates the command value A second result which is the difference between the power value of the distributed power system DG measured at the time point P2 and the lower limit value TARGET MIN1 is calculated and the power value discharged from the battery 110
  • the discharge command value DC1 can be generated.
  • the command value generating unit 136 may provide the generated discharge command value DC1 to the PCS 100 and the PCS 100 may supply the battery 110 of FIG. 1 on the basis of the provided discharge command value DC1
  • the composite power value can be made to be the lower limit value by discharging. In addition, through this, the combined power can be included within the variation limit range (lower limit value to upper limit value).
  • the discharge mechanism may be performed at the third time point P3 and the second time point P2.
  • the command value generator 136 when the power value of the distributed power system DG is measured to exceed the upper limit value TARGET MAX1 at the fourth point in time P4, the command value generator 136 generates A first result value which is a difference value between the power value of the distributed power supply system DG measured at the fourth time point P4 and the upper limit value TARGET MAX1 is calculated and the power value charged to the battery 110 It is possible to generate the charging command value CC1 so as to be the resultant value.
  • the command value generating unit 136 may provide the generated charging command value CC1 to the PCS 100 and the PCS 100 may supply the battery 110 of FIG. 1 on the basis of the supplied charging command value CC1 So that the combined power value can be made the upper limit value. In addition, through this, the combined power can be included within the variation limit range (lower limit value to upper limit value).
  • Such a charging mechanism may be performed through the same process as the fourth time point P4 at the fifth time point P5.
  • the output power stabilization process of the above-described distributed power supply system may be performed after the sixth time point P6 through the same mechanism.
  • Figures 6 and 7 are graphs illustrating another example of a method by which the energy storage system of Figure 1 stabilizes the output power of a distributed power system.
  • the operation principle of the reference value calculation unit 132 and the upper / lower limit value setting unit 134 is the same as that of FIG. 5, and a description thereof will be omitted.
  • the command value generator 136 when the upper limit value TARGETMAX and the lower limit value TARGETMIN of the reference value MV1 and the synthesized power target value are set, the command value generator 136 generates a command value
  • the combined power target value is larger than the lower limit value TARGETMIN and the upper limit value TARGETMAX based on the power value of the distributed power system DG measured at the next time point
  • a command value can be generated so as to be a small value.
  • the command value generating unit 136 generates a command value when the power value of the distributed power system DG measured at a specific point in time (for example, the third point of time P3)
  • the power value of the distributed power system DG measured at the third time point P3 is equal to or lower than the lower limit value TARGET MIN
  • the charge command value associated with the charge of the battery 110 in FIG. 1
  • the command value generating unit 136 when the power value of the distributed power system DG measured at the third time point P3 is equal to or greater than the upper limit value TARGETMAX, the command value generating unit 136 generates the command value DG and the difference between the power value of the distributed power system DG measured at the third point of time P3 and the lower limit value TARGET MIN, which is the difference between the power value of the distributed power system DG and the upper limit value TARGET MAX, And generate a charging command value so that the power value charged to the battery (110 in Fig. 1) becomes a value between the first resultant value and the second resultant value.
  • the command value generation unit 136 when the power value of the distributed power system DG measured at the third time point P3 is equal to or less than the lower limit value TARGET MIN, the command value generation unit 136 generates a command value, which is a difference between the power value of the distributed power system DG and the lower limit value TARGETMIN measured at the third time point P3 and the first resultant value which is the difference between the power value of the distributed power system DG and the upper limit value TARGETMAX, 2, and generate a discharge command value such that the power value discharged from the battery (110 in FIG. 1) becomes a value between the first resultant value and the second resultant value.
  • the command value generation unit 136 may provide the PCS 100 with a charging command value or a discharge command value generated through the above process and the PCS 100 may generate the charging command value or the discharge command value based on the supplied charging command value or the discharge command value
  • the battery (110 in Fig. 1) can be charged and discharged.
  • the command value generator 136 when the power value of the distributed power system DG is measured to be equal to or lower than the lower limit value TARGETMIN at the third time point P3, the command value generator 136 generates the third The first result which is the difference between the power value of the distributed power system DG measured at the time point P3 and the upper limit value TARGETMAX and the power value of the distributed power system DG measured at the third time point P3 And a second resultant value which is a difference value of the lower limit value TARGETMIN is calculated and the discharge command value DC2 (DC2) is calculated so that the power value discharged from the battery (110 in FIG. 1) becomes a value between the first resultant value and the second resultant value Can be generated.
  • DC2 discharge command value
  • the command value generating unit 136 may provide the generated discharge command value DC2 to the PCS 100 and the PCS 100 may supply the battery 110 of FIG. 1 on the basis of the provided discharge command value DC2 By discharging, the combined power value can be made larger than the lower limit value (TARGET MIN) and smaller than the upper limit value (TARGET MAX).
  • the combined power can be included within the range of variation limits (lower limit to upper limit).
  • the battery (110 in FIG. 1) is further discharged by increasing the combined power value to be larger than the lower limit value (TARGET MIN) 1 < SEP > 110 < SEP > 1 < SEP >
  • the discharge command values DC1 and DC3 generated at the second time point P2 and the fourth time point P4 are set such that the combined power target value is the upper limit value TARGET MAX or the lower limit value TARGET MIN, Is different from the discharge command value DC1 generated at the third time point P3.
  • the discharge amount of the battery (110 in FIG. 1) by the discharge command value DC2 generated at the third time point P3 is equal to the discharge command value DC2 generated by the discharge command value DC1 generated at the second time point P2 1) of the battery (110 in Fig. 1) by the discharge command value DC3 generated at the fourth time point P4.
  • the command value generation unit 136 when the power value of the distributed power system DG is measured to be equal to or higher than the upper limit value TARGET MAX at the third time point P3, the command value generation unit 136 generates the command value
  • the first result which is the difference between the power value of the distributed power system DG and the upper limit value TARGET MAX measured at the third point P3 and the power value of the distributed power system DG measured at the third point of time P3, (TARGET MIN), and calculates a second resultant value as a difference between the charge command value CC2 so that the power value charged to the battery (110 in FIG. 1) becomes a value between the first resultant value and the second resultant value, Can be generated.
  • the command value generating unit 136 may provide the generated charging command value CC2 to the PCS 100 and the PCS 100 may supply the battery 110 of FIG. 1 on the basis of the supplied charging command value CC2
  • the composite power value can be made smaller than the upper limit value by charging.
  • the combined power can be included within the range of variation limits (lower limit to upper limit).
  • the charging command values CC1 and CC3 generated at the second time point P2 and the fourth time point P4 are set such that the combined power target value is the upper limit value TARGET MAX or the lower limit value TARGET MIN, Is different from the charging command value CC1 generated at the third time point P3.
  • the amount of charge of the battery (110 in FIG. 1) by the charge command value CC2 generated at the third time point P3 is smaller than the charge amount of the battery (FIG. 1) by the charge command value CC1 generated at the second time point P2 (110 in FIG. 1) by the charging command value CC3 generated at the fourth time point P4 and the charging amount of the battery (110 in FIG.
  • Figs. 8 and 9 are graphs illustrating another example of a method by which the energy storage system of Fig. 1 stabilizes the output power of a distributed power system.
  • Fig. 8 and 9 are graphs illustrating another example of a method by which the energy storage system of Fig. 1 stabilizes the output power of a distributed power system.
  • the operation principle of the reference value calculation unit 132 and the upper / lower limit value setting unit 134 is the same as that of FIG. 5, and a description thereof will be omitted.
  • the command value generator 136 when the upper limit value TARGETMAX and the lower limit value TARGETMIN of the reference value MV1 and the synthesized power target value are set, the command value generator 136 generates the command value MV2 at the second time point P2 And the power value of the distributed power system DG measured at the third point of time P3 after the second point of time P 2 and calculates the power generation slope Slope based on the power generation slope Slope, The command value can be generated so that the value is a value between the upper limit value TARGET MAX and the lower limit value TARGET MIN.
  • the command value generator 136 generates a command value from the second time point P3 on the basis of the power generation amount slope when the power generation amount slope is an increasing slope,
  • the estimated power value of the distributed power system DG at the fifth point in time P5 can be calculated.
  • the command value generator 136 may generate a charging command value related to charging of the battery (110 in Fig. 1) based on the calculated estimated power value of the distributed power system DG.
  • the command value generating unit 136 generates a command value based on the power generation slope Slope when the power generation amount slope is a decreasing slope, It is possible to calculate the estimated power value of the power supply DG. Also, the command value generator 136 may generate a discharge command value related to the discharge of the battery (110 in FIG. 1) based on the calculated estimated power value of the distributed power system DG.
  • the combined power may still remain at a value greater than the upper limit value TARGET MAX.
  • the combined power may still remain below the lower limit (TARGET MIN).
  • the command value generation unit 136 when the power value of the distributed power system DG measured at the third time point P3 is equal to or greater than the upper limit value TARGETMAX, the command value generation unit 136 generates the command value DG) and a difference value between the upper limit value TARGETMAX and a charge command value so that the power value charged to the battery 110 (FIG. 1) becomes the first resultant value .
  • the command value generating unit 136 when the power value of the distributed power system DG measured at the third time point P3 is equal to or less than the lower limit value TARGET MIN, the command value generating unit 136 generates a command value, A second result value which is a difference value between the power value of the battery DG and the lower limit value TARGET MIN can be calculated and a discharge command value can be generated so that the power value discharged from the battery 110 have.
  • the command value generation unit 136 may provide the PCS 100 with a charging command value or a discharge command value generated through the above process and the PCS 100 may generate the charging command value or the discharge command value based on the supplied charging command value or the discharge command value
  • the battery (110 in Fig. 1) can be charged and discharged.
  • the command value generator 136 calculates the difference between the power value of the distributed power system DG and the upper limit value TARGET MAX measured at the fifth point of time P5 that is two points later than the third point of time P3 based on the calculated power generation slope Slope And generates a charging command value CC2 so that the power value charged to the battery (110 in FIG. 1) becomes the second resultant value.
  • the time difference between the second time point P2 and the third time point P3 is the first time and the time difference between the third time point P3 and the fifth time point P5 is N times N May be a natural number of 2 or more).
  • N may be a positive number greater than 1 but not a natural number of 2 or more, or may be a distributed power system measured at a particular time after one or more than three time points, rather than after two time points after the third time point P3.
  • the estimated power value of the current power DG may be used.
  • N is a natural number of 2 or more, and is measured at a fifth point of time P5 after two points of time from the third point of time P3
  • the estimated power value of the distributed power supply system DG will be described as an example.
  • the command value generating unit 136 may provide the generated charging command value CC2 to the PCS 100 and the PCS 100 may supply the battery 110 of FIG. 1 on the basis of the supplied charging command value CC2 So that the combined power value can be a value between the upper limit value TARGET MAX and the lower limit value TARGET MIN.
  • the combined power can be included within the range of variation limits (lower limit to upper limit).
  • the charge amount of the battery (110 in FIG. 1) by the charge command value CC2 generated at the fifth time point P5 is equal to the charge command value generated at the third time point P3 (110 in FIG. 1) by the battery cell CC1.
  • the command value generator 136 Is a difference value between the power value of the distributed power system DG and the lower limit value TARGET MIN measured at the fifth point of time P5 which is two points after the third point of time P3 based on the calculated power generation slope Slope , And generate a discharge command value DC2 such that the power value discharged from the battery (110 in FIG. 1) becomes the second resultant value.
  • the time difference between the second time point P2 and the third time point P3 is the first time and the time difference between the third time point P3 and the fifth time point P5 is N times N May be a natural number of 2 or more).
  • the command value generating unit 136 may provide the generated discharge command value DC2 to the PCS 100 and the PCS 100 may supply the battery 110 of FIG. 1 on the basis of the provided discharge command value DC2 By discharging, the combined power value can be a value between the upper limit value TARGET MAX and the lower limit value TARGET MIN.
  • the combined power can be included within the range of variation limits (lower limit to upper limit).
  • the discharge amount of the battery (110 in FIG. 1) by the discharge command value DC2 generated at the fifth time point P5 is equal to the discharge command value D3 generated at the third time point P3, (110 in Fig. 1) by the value DC1.
  • FIG. 10 is a graph illustrating another example of a method by which the energy storage system of FIG. 1 stabilizes the output power of a distributed power system;
  • the operation principle of the reference value calculation unit 132 and the upper / lower limit value setting unit 134 is the same as that of FIG. 5, and a description thereof will be omitted.
  • the command value generation unit 136 when the upper limit value TARGET MAX1 and the lower limit value TARGET MIN1 of the reference value MV1 and the synthesized power target value are set, the command value generation unit 136 generates a command value
  • the initial command value (TARGET) is set such that the combined power target value is the lower limit value TARGET MIN1 or the upper limit value TARGET MAX1, based on the power value of the distributed power system DG measured at the next time point (for example, (Initial charge command value or initial discharge command value).
  • the command value generator 136 determines that the battery (110 of FIG. 1) And generates an initial discharge command value related to the discharge of the battery (110 in FIG. 1) when the power value of the distributed power system DG measured at a specific point in time is lower than the lower limit value TARGET MIN1 .
  • the command value generator 136 outputs the power value of the distributed power system DG measured at the specific point in time and the upper limit value TARGET MAX1), and generate an initial charge command value such that a power value charged to the battery (110 in FIG. 1) becomes a first resultant value.
  • the command value generator 136 outputs the power value of the distributed power system DG measured at the specific point in time, (TARGET MIN1), and generate the initial discharge command value so that the power value discharged from the battery (110 in FIG. 1) becomes the second resultant value.
  • the command value generating unit 136 may provide the command value correcting unit (not shown) with the initial charge command value or the initial charge command value generated through the process described above.
  • the command value correcting unit can generate the final command value (final charge command value or final discharge command value) by correcting the initial command value such that the combined power target value is larger than the lower limit value (TARGET MIN1) and smaller than the upper limit value (TARGET MAX1) have.
  • the command value correcting unit receives the initial command value from the command value generating unit 136, corrects the provided initial command value, and outputs a command value larger than the lower limit value TARGET MIN1 and smaller than the upper limit value TARGET MAX1
  • the final command value can be generated.
  • command value correcting unit may be included in the command value generating unit 136 or may exist separately.
  • the command value generator 136 when the power value of the distributed power system DG is measured to be equal to or lower than the lower limit value TARGET MIN1 at the second time point P2, the command value generator 136 generates the command value A second result which is the difference between the power value of the distributed power system DG measured at the time point P2 and the lower limit value TARGET MIN1 is calculated and the power value discharged from the battery 110
  • the initial discharge command value DC1 can be generated.
  • the command value generating unit 136 may provide the generated initial discharge command value DC1 to the command value correcting unit.
  • the command value correcting unit may calculate the command value DC1 based on the provided initial discharge command value DC1,
  • the final discharge command value DC1 ' may be generated such that the power value discharged from the first discharge command value is greater than the second result value.
  • the command value generator 136 may provide the generated final discharge command value DC1 'to the PCS 100, and the PCS 100 may calculate the final discharge command value DC1' based on the received final discharge command value DC1 ' 1 of 110) is discharged, the combined power value can be made larger than the lower limit value TARGET MIN1.
  • the combined power can be included within the variation limit range (lower limit value to upper limit value).
  • the discharge mechanism may be performed at the third time point P3 and the second time point P2.
  • the command value generator 136 when the power value of the distributed power system DG is measured to be equal to or higher than the upper limit value TARGET MAX1 at the fourth time point P4, the command value generator 136 generates the command value A first result value which is a difference value between the power value of the distributed power system DG measured in step P4 and the upper limit value TARGET MAX1 is calculated and the power value charged to the battery 110
  • the initial charging command value CC1 can be generated.
  • the command value generating unit 136 may supply the generated initial charge command value CC1 to the command value correcting unit and the command value correcting unit may be configured to generate the command value CC1 based on the provided initial charge command value CC1,
  • the final charging command value CC1 ' may be generated so that the power value to be charged to the first charging current value is greater than the first charging current value.
  • the command value generator 136 may also provide the generated final charge command value CC1 'to the PCS 100 and the PCS 100 may calculate the final charge command value CC1' based on the received final charge command value CC1 ' 1) 110 of the first and second embodiments, the combined power value can be a value smaller than the upper limit value TARGET MAX1.
  • the combined power can be included within the variation limit range (lower limit value to upper limit value).
  • This discharge mechanism may be performed through the same process as the fourth time point P4 at the fifth time point P5.
  • the output power of the distributed power system DG (that is, the power supplied to the grid GRID) through the charging and discharging of the battery 110
  • the output power of the grid GRID can be stabilized and the instability of the grid GRID can be reduced.
  • the output power of the distributed power system DG is stabilized by reducing the rate of change of the output power, not the smoothing of the output power of the distributed power system DG, thereby reducing the capacity of the battery 110.
  • the battery cost can be reduced.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

La présente invention se rapporte à un système de stockage d'énergie. Un système de stockage d'énergie selon un mode de réalisation de la présente invention est raccordé à un réseau électrique et à un système d'alimentation distribué, et comprend : un système d'état de puissance (PCS pour Power Condition System) destiné à gérer la puissance d'un système d'alimentation distribué et la puissance d'un réseau électrique ; une batterie chargée ou déchargée par le système PCS ; et un dispositif de commande de couche supérieure destiné à générer une valeur de commande pour commander la charge ou la décharge de la batterie sur la base d'une valeur de puissance générée par le système d'alimentation distribué, et à fournir la valeur de commande générée au système PCS, le dispositif de commande de couche supérieure comprenant : une unité de calcul de valeur de référence destinée à calculer une valeur de référence sur la base d'une valeur de puissance générée par le système d'alimentation distribué à un premier instant et d'une valeur de puissance chargée ou déchargée par la batterie ; une unité de fixation de valeurs limites supérieure et inférieure pour fixer une valeur limite supérieure et une valeur limite inférieure d'une valeur cible de puissance combinée du système d'alimentation distribué et de la batterie, sur la base de la valeur de référence calculée ; et une unité de génération de valeur de commande destinée à générer une valeur de commande de telle sorte que la valeur cible de puissance combinée soit supérieure à la valeur limite inférieure et soit inférieure à la valeur limite supérieure, sur la base d'une valeur de puissance du système d'alimentation distribuée, qui est mesurée à un second instant ultérieur au premier instant.
PCT/KR2018/004591 2017-06-21 2018-04-20 Système de stockage d'énergie Ceased WO2018236038A1 (fr)

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