CN111600389A - Energy storage monitoring system - Google Patents
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- CN111600389A CN111600389A CN202010524280.1A CN202010524280A CN111600389A CN 111600389 A CN111600389 A CN 111600389A CN 202010524280 A CN202010524280 A CN 202010524280A CN 111600389 A CN111600389 A CN 111600389A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 153
- 238000012544 monitoring process Methods 0.000 title claims abstract description 29
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an energy storage monitoring system, comprising: the energy management system EMS comprises a server, a human-computer interface HMI, a telecontrol device and a coordination controller PMS, and the telecontrol device is connected with a dispatching center. The energy storage monitoring system provided by the invention adopts the combination of the monitoring system and the energy storage system, and can play a role in uploading and releasing: on one hand, a power grid or microgrid system scheduling instruction is received, on the other hand, the power grid or microgrid system scheduling instruction is distributed to each energy storage branch according to an energy management strategy, and meanwhile, the running state of the whole energy storage system is monitored, so that the randomness, the intermittence and the instability of power generation of a power system are effectively compensated and restrained.
Description
Technical Field
The invention belongs to the field of electric energy storage, and particularly relates to an energy storage monitoring system.
Background
The power production process is carried out continuously, the power generation-transmission-transformation-distribution-power utilization must be kept balanced all the time, the production and the consumption are required to be completed simultaneously, and the safety and the stability can be caused by the instant unbalance. However, the demand of users in the power grid or microgrid system for power greatly varies between day and night and in different seasons, which makes the power system have to reserve a large spare capacity, and the system equipment has low operation efficiency. In addition, due to the randomness, intermittence and instability of power generation of the power system, peak regulation of the power grid or the micro-grid system is assisted, electric energy is smoothly output, and the stability of the power grid or the micro-grid system is improved.
Disclosure of Invention
In order to solve the problems, the invention provides an energy storage monitoring system, which is combined with an energy storage system to play a role in uploading and releasing: on one hand, a power grid or microgrid system scheduling instruction is received, on the other hand, the power grid or microgrid system scheduling instruction is distributed to each energy storage branch according to an energy management strategy, and meanwhile, the running state of the whole energy storage system is monitored, so that the randomness, the intermittence and the instability of power generation of a power system are effectively compensated and restrained.
In order to achieve the purpose, the invention adopts the technical scheme that:
an energy storage monitoring system comprising: the energy management system EMS comprises an energy storage battery, a battery management system BMS, an energy storage converter PCS and a transformer, wherein the transformer is connected to an alternating current bus in a power grid or a micro-grid system;
the energy storage battery is used for realizing mutual conversion of electric energy and chemical energy, and storing and releasing electric energy for the system; the battery management system BMS is used for detecting and managing the electric energy parameters of the energy storage battery in real time; the energy storage converter PCS is used for realizing the mutual conversion of direct current and alternating current and receiving a command of the coordination controller PMS to control the energy storage battery; the transformer is used for isolating the energy storage converter PCS from a power grid or a microgrid system; the server is used for storing, receiving, transmitting and processing data in the energy storage system and providing a data interface for remote access; the human-computer interface HMI is used for displaying system operation data and realizing local control of the system; the telemechanical device is used for acquiring and monitoring system operation data; and the coordination controller PMS is used for receiving a command of the dispatching center or a command set by the human-computer interface HMI and completing power distribution and coordination control of the energy storage converters PCS.
Preferably, a primary loop of the energy storage battery is connected with a direct current side of a primary loop of the energy storage converter PCS, and a secondary loop of the energy storage battery is connected with the battery management system BMS; the alternating current side of the energy storage converter PCS is connected with the transformer, and a secondary circuit is respectively connected with the battery management system BMS and the coordination controller PMS; the transformer is respectively connected with the alternating current side of the energy storage converter PCS and an alternating current bus in a power grid or a microgrid system;
and the coordination controller PMS is connected with a power grid or a micro-grid system bus secondary circuit and an energy storage converter PCS secondary circuit, and is connected with the server, the human-computer interface HMI and a bus of the telecontrol device.
Preferably, said coordinating controller PMS comprises two modes of operation: the remote mode refers to that the coordination controller PMS receives a scheduling command of the scheduling center to complete power distribution and coordination control of a plurality of energy storage converters PCS, and the local mode refers to that the coordination controller PMS completes power distribution and coordination control of the plurality of energy storage converters PCS according to the scheduling command set by the outside through the human-computer interface HMI.
The optimization effect brought by the optimization scheme is that the coordination controller PMS can receive the scheduling command of the power grid or the microgrid system and the command set by the human-computer interface HMI, so that the operation of the energy storage system is optimized, and the randomness, the intermittence and the instability of the power generation of the power system are effectively compensated and restrained.
Preferably, the energy storage converter PCS is configured to receive a command from the coordination controller PMS to control the energy storage battery to implement active power tracking, peak clipping and valley filling, plan curve, frequency modulation and voltage regulation, fluctuation stabilization, power distribution, and SOC adjustment functions of the system.
More preferably, the active power tracking function means that the coordination controller PMS controls the charge and discharge power of the energy storage battery according to the received active command value.
More preferably, the peak clipping and valley filling functions are that the coordination controller PMS controls the charge and discharge power of the energy storage battery according to set peak and valley values, that is, when the output power of the power grid is greater than or equal to the peak power, the energy storage battery is charged to absorb the peak power, and when the output power of the power grid is less than or equal to the valley power, the energy storage battery is discharged to fill the valley power.
More preferably, the plan curve function means that the coordination controller PMS schedules charging and discharging of the energy storage battery according to a set plan curve.
More preferably, the frequency and voltage adjusting function is that the coordination controller PMS adjusts the frequency and voltage of the power grid by controlling the charging and discharging power of the energy storage battery.
More preferably, the fluctuation stabilizing function is that the coordination controller PMS stabilizes power fluctuation of power generation by controlling and coordinating charging and discharging of the energy storage battery.
More preferably, the power distribution and SOC adjustment function is that the coordination controller PMS controls the energy storage battery to control the SOC value of the energy storage battery within a certain range during charging and discharging.
Compared with the prior art, the invention has the beneficial effects that:
1. the energy storage monitoring system provided by the invention adopts the combination of the monitoring system and the energy storage system, and can play a role in uploading and releasing: on one hand, a power grid or microgrid system scheduling instruction is received, on the other hand, the power grid or microgrid system scheduling instruction is distributed to each energy storage branch according to an energy management strategy, meanwhile, the running state of the whole energy storage system is monitored, running data is analyzed, and the energy storage system is ensured to be in a good working state. Meanwhile, the power distribution can be carried out by combining the scheduling instruction and the battery running state, the optimized running of the energy storage system is realized, the randomness, the intermittence and the instability of the power generation of the power system are effectively compensated and restrained, and the method has important effects on improving the photovoltaic power generation quality, assisting the peak regulation of a power grid or a micro-grid system, smoothly outputting electric energy, improving the stability of the power grid or the micro-grid system and the like.
2. The communication part of the energy storage system of the energy storage monitoring system adopts a form of separated networking of conventional monitoring and high-speed control. The energy management system EMS monitors and manages the whole set of energy storage system, so that a steady-state control function is realized, and the safe and reliable operation of the system is guaranteed; the coordination controller PMS realizes a transient control function, and formulates a corresponding control strategy according to different application scenes to reasonably control the coordinated operation of the multi-energy storage converter PCS; the energy storage converter PCS realizes the bidirectional flow of energy in the energy storage battery and the power grid or the microgrid system; the battery system comprises an energy storage battery and a battery management system BMS, and the battery management system BMS realizes effective management and control of the battery.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage monitoring system according to the present invention.
Fig. 2 is a schematic diagram of peak clipping and valley filling according to the present embodiment.
Fig. 3 is a schematic diagram of a planning curve according to the present embodiment.
Fig. 4 is a schematic diagram of frequency modulation according to the present embodiment.
Fig. 5 is a schematic diagram of voltage regulation according to the present embodiment.
Fig. 6 is a schematic diagram of the smooth fluctuation according to the present embodiment.
Fig. 7 is a schematic diagram of power distribution when the energy storage battery according to the embodiment is charged.
Fig. 8 is a schematic diagram of power distribution when the energy storage battery according to the embodiment is discharged.
Fig. 9 is a schematic diagram of SOC adjustment control according to the present embodiment.
Wherein, 1, an energy storage battery; 2. a battery management system BMS; 3. an energy storage converter PCS; 4. a transformer; 5. a power grid or microgrid system; 6. a server; 7. a human-machine interface HMI; 8. a telemechanical device; 9. a coordinating controller PMS; 10. and a dispatching center.
Detailed Description
For a better understanding of the present invention, the contents of the present invention will be further explained below with reference to the drawings and examples, but the present invention is not limited to the following examples.
Examples
As shown in fig. 1, an energy storage monitoring system includes: the energy management system EMS comprises a server 6, a human-computer interface HMI7, a telecontrol device 8 and a coordination controller PMS9, and the telecontrol device 8 is connected with a dispatching center 10.
The primary loop of the energy storage battery 1 is connected with the direct current side of the primary loop of the energy storage converter PCS 3, and the secondary loop is connected with the battery management system BMS 2; the alternating current side of the energy storage converter PCS 3 is connected with the transformer 4, and the secondary circuit is respectively connected with the battery management system BMS 2 and the coordination controller PMS 9; and the transformer 4 is respectively connected with the alternating current side of the energy storage converter PCS 3 and an alternating current bus in a power grid or microgrid system 5. And the coordination controller PMS9 is connected with a power grid or a bus secondary circuit of the microgrid system 5 and a secondary circuit of the energy storage converter PCS 3, and is connected with a server 6, a human-computer interface HMI7 and a bus of the telecontrol device 8.
The energy storage battery 1 is used for realizing mutual conversion between electric energy and chemical energy, storing the electric energy for the system and releasing the electric energy, so as to realize bidirectional flow of the energy in the energy storage battery 1 and the power grid or microgrid system 5. The energy storage battery 1 is specifically a zinc-iron flow battery, and each unit is a set of GS200-200kW/600 kWh.
The battery management system BMS 2 is used for detecting and managing the electric energy parameters of the energy storage battery 1 in real time, the electric energy parameters comprise the voltage, the current and the temperature of the energy storage battery 1 so as to monitor the internal operation characteristics of the battery, and the monitoring precision is every pair of polar plates.
The energy storage converter PCS 3 is used for realizing the interconversion of direct current and alternating current and receiving a command of the coordination controller PMS9 to control the energy storage battery 1.
The transformer 4 is used for isolating the energy storage converter PCS 3 from the power grid or microgrid system 5. The transformer 4 converts the energy storage current conversion alternating current output voltage into voltage required by a system, and meanwhile, the functions of electrical safety isolation, filtering and anti-interference are achieved, the interference of higher harmonics and lightning stroke electric pulses introduced from a power grid to the system can be effectively inhibited, and the interference of higher harmonics sent by the energy storage current converter PCS 3 entering the power grid to other equipment can be effectively inhibited.
The server 6 is used for storing, receiving, transmitting and processing data in the energy storage system and provides a data interface for remote access. The human-computer interface HMI7 is used for displaying system operation data and realizing local control of the system, and the local control means that the human-computer interface HMI7 is used for realizing the purpose of setting a fixed value and an active instruction value for the coordinating controller PMS9 to control the charging and discharging power of the energy storage battery 1.
The telecontrol device 8 is used for collecting and monitoring system operation data. The telecontrol device 8 is a device for connecting the dispatching center 10 with the energy storage system, the national power grid dispatching center 10 collects data sent by the energy storage system through the telecontrol device 8, monitors the running mode and the state of the energy storage system, automatically processes and stores the data, finishes automatic printing of reports, and can realize remote control and adjustment according to the running requirements.
The coordination controller PMS9 is used for receiving a command of the dispatching center 10 or a command set by the human-computer interface HMI7 and completing power distribution and coordination control of the energy storage converters PCS 3.
The coordination controller PMS9 comprises two modes of operation: the remote mode refers to that the coordination controller PMS9 receives a scheduling command of the scheduling center 10 to complete power distribution and coordination control of the plurality of energy storage converters PCS 3, and the local mode refers to that the coordination controller PMS9 completes power distribution and coordination control of the plurality of energy storage converters PCS 3 according to the scheduling command set by the outside through the human-computer interface HMI 7.
The coordination controller PMS9 realizes the following functions by controlling the energy storage converter PCS 3:
(1) and an active power tracking function, wherein the coordination controller PMS9 controls the charging and discharging power of the energy storage battery 1 according to the received active command value.
The energy storage battery 1 can quickly respond to the scheduling instruction, and the effect of auxiliary power regulation is realized. The coordination controller PMS9 power tracking control may select to support either the remote mode or the local mode via a fixed value control word. The remote mode means that the coordination controller PMS9 controls the charging and discharging power of the energy storage battery 1 according to an active power command value sent by the dispatching center 10; the local control means controlling the energy storage charging and discharging power according to an active instruction value set by a fixed value in the coordinated controller PMS 9. The coordination controller PMS9 controls the active output of the energy storage system by detecting the currently output active power and the received power command in real time, so that the scheduling command is responded quickly and accurately.
(2) As shown in fig. 2, the energy storage system has excellent peak shaving performance due to its fast response characteristic, and can be used as a power supply to release electric energy in the peak period of power utilization and as a load to absorb electric energy in the valley period of power utilization, thereby improving the economical efficiency and safety of power grid operation. The coordination controller PMS9 peak clipping and valley filling functions can selectively support a remote mode or a local mode through a fixed value control word. The remote mode refers to that the coordination controller PMS9 controls energy storage charging and discharging power according to the peak and valley values sent by the scheduling center 10; the local control means controlling the energy storage charging and discharging power according to the peak and valley values set by the fixed value in the coordinated controller PMS 9. When the output power is greater than the peak power, the energy storage battery 1 is charged to absorb the peak power; when the output power is smaller than the valley power, the energy storage battery 1 discharges to fill the valley power.
(3) The scheduling curve function, as shown in fig. 3, is to coordinate the controller PMS9 to control the output of the energy storage system to schedule charging and discharging according to a predetermined scheduling curve. The coordinating controller PMS9 may choose to support either the remote mode or the local mode by means of a fixed value control word. The remote mode refers to that the coordination controller PMS9 controls the charging and discharging power of the energy storage battery 1 according to the planned curve power value sent by the scheduling center 10; the local control means that the charging and discharging power of the energy storage battery 1 is controlled according to the planned curve power value set by a fixed value in the coordinated controller PMS 9.
(4) The frequency modulation and voltage regulation function, the energy storage system can assist the frequency modulation of the power grid, and the frequency modulation effect is improved by utilizing the quick response characteristic of the energy storage system. Meanwhile, the energy storage system can also output reactive power, and the effect of auxiliary voltage regulation is achieved.
The frequency of the power grid depends on the balance relation between the power generation active power and the load active power, and when the power generation active power is greater than the load active power, the system frequency rises; when the active power of the power generation is smaller than the active power of the load, the frequency of the system is reduced. The coordination controller PMS9 assists in adjusting the power generation active power through active-frequency (P-F) droop control to balance it with the load active power in real time, thereby stabilizing the system frequency. When the system frequency is reduced, the energy storage battery 1 discharges to increase the active output; when the system frequency rises, the energy storage battery 1 is charged to reduce the active output, and the frequency modulation schematic diagram is shown in fig. 4.
The voltage of the power grid depends on the balance relation between the generating reactive power and the load reactive power, and when the generating reactive power is greater than the load reactive power, the system voltage rises; and when the generating reactive power is less than the load reactive power, the system voltage is reduced. The energy storage system assists in adjusting the reactive power of power generation through reactive-voltage (Q-V) droop control, so that the reactive power of power generation and the reactive power of a load are balanced in real time, and the voltage of the system is stabilized. When the system voltage drops, the energy storage system sends out reactive power; when the system voltage rises, the energy storage system absorbs reactive power, and the voltage regulation schematic diagram is shown in fig. 5.
(5) The fluctuation stabilizing function is shown in fig. 6, the photovoltaic power generation, the wind power generation and other new energy power generation have large intermittence and fluctuation, and the performance of grid-connected power generation is seriously influenced. More and more researches are carried out to utilize the energy storage capacity of the energy storage battery 1 to stabilize the power fluctuation of new energy power generation through the charging and discharging of the battery.
The fluctuation stabilizing control is divided into a first-order filtering control mode and a power fluctuation limiting control mode according to an algorithm and can be set through a control word. The first-order filtering control strategy is to perform first-order low-pass filtering according to the output power of the power supply end, and eliminate the power component which changes rapidly and does not meet the fluctuation limit requirement by using the energy storage system, so that the rest is the smooth power component with small fluctuation. The power fluctuation limiting control strategy is to detect the output power of the power supply end in real time, count the fluctuation amount of the power supply end in a certain time period, and if the power fluctuation component exceeds the fluctuation limiting value set by the device, the energy storage system performs charging and discharging to inhibit the fluctuation amount. The device can be adjusted through a fixed value, so that the control target meets the power fluctuation limits of different time scales.
(6) The power distribution and SOC adjustment functions are different in charging and discharging characteristics between the battery packs and different in SOC values for the energy storage units having a large capacity. In order to ensure the balanced charging and discharging of each battery pack and prolong the service life of the battery, the coordination controller PMS9 is provided with a power balanced distribution strategy and an SOC adjustment control strategy. The coordination controller PMS9 acquires the SOC state of each battery pack, and for each charging and discharging power, proportionally distributes the SOC state to each battery pack according to the SOC of each battery pack. As shown in fig. 7 and 8, during charging, the battery pack having a small SOC is charged with priority, and the charging power is large; during discharge, the battery pack having a large SOC is discharged with priority, and the discharge power is large.
In order to enable each battery pack of the energy storage system to have a proper SOC value, each charging and discharging instruction can respond, SOC adjustment control is performed on the premise that the operation of other functional modules is not affected, the coordination controller PMS9 controls the SOC within a reasonable range by using a control strategy of slow charging and slow discharging, and the control principle is as shown in FIG. 9.
In this embodiment, an energy storage communication control cabinet is configured: the energy storage system coordination controller JDS-9567C is used for receiving an instruction of an energy management system EMS or a dispatching center 10 and completing power distribution and coordination control of the energy storage converters PCS 3; the new energy power generation intelligent integrated device JDS-9726 is used for protocol conversion; the 1 JDS-9882 switch is used for monitoring system communication; 1 optical cable termination box; 1 UPS of 2kVA is used for the inside power supply of communication control cabinet.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An energy storage monitoring system, comprising: the energy management system EMS comprises an energy storage battery, a battery management system BMS, an energy storage converter PCS and a transformer, wherein the transformer is connected to an alternating current bus in a power grid or a micro-grid system;
the energy storage battery is used for realizing mutual conversion of electric energy and chemical energy, and storing and releasing electric energy for the system;
the battery management system BMS is used for detecting and managing the electric energy parameters of the energy storage battery in real time;
the energy storage converter PCS is used for realizing the mutual conversion of direct current and alternating current and receiving a command of the coordination controller PMS to control the energy storage battery; the transformer is used for isolating the energy storage converter PCS from a power grid or a microgrid system; the server is used for storing, receiving, transmitting and processing data in the energy storage system and providing a data interface for remote access; the human-computer interface HMI is used for displaying system operation data and realizing local control of the system; the telemechanical device is used for acquiring and monitoring system operation data; and the coordination controller PMS is used for receiving a command of the dispatching center or a command set by the human-computer interface HMI and completing power distribution and coordination control of the energy storage converters PCS.
2. The energy storage monitoring system according to claim 1, wherein the primary loop of the energy storage battery is connected with the direct current side of the primary loop of the energy storage converter PCS, and the secondary loop is connected with the battery management system BMS; the alternating current side of the energy storage converter PCS is connected with the transformer, and a secondary circuit is respectively connected with the battery management system BMS and the coordination controller PMS; the transformer is respectively connected with the alternating current side of the energy storage converter PCS and an alternating current bus in a power grid or a microgrid system;
and the coordination controller PMS is connected with a power grid or a micro-grid system bus secondary circuit and an energy storage converter PCS secondary circuit, and is connected with the server, the human-computer interface HMI and a bus of the telecontrol device.
3. An energy storage monitoring system according to claim 1, characterized in that said coordination controller PMS comprises two modes of operation: the remote mode refers to that the coordination controller PMS receives a scheduling command of the scheduling center to complete power distribution and coordination control of a plurality of energy storage converters PCS, and the local mode refers to that the coordination controller PMS completes power distribution and coordination control of the plurality of energy storage converters PCS according to the scheduling command set by the outside through the human-computer interface HMI.
4. The energy storage monitoring system according to claim 1, wherein the energy storage converter PCS is configured to receive a command from the coordination controller PMS to control the energy storage battery to implement active power tracking, peak clipping and valley filling, plan curve, frequency modulation and voltage regulation, fluctuation smoothing, power distribution and SOC adjustment functions of the system.
5. The energy storage monitoring system according to claim 4, wherein the active power tracking function is that the coordination controller PMS controls the charge and discharge power of the energy storage battery according to the received active command value.
6. The energy storage monitoring system according to claim 4, wherein the peak clipping and valley filling functions are that the coordination controller PMS controls the charge and discharge power of the energy storage battery according to the set peak and valley values, that is, when the output power of the power grid is greater than or equal to the peak power, the energy storage battery is charged to absorb the peak power, and when the output power of the power grid is less than or equal to the valley power, the energy storage battery is discharged to fill the valley power.
7. The energy storage monitoring system according to claim 4, wherein the schedule curve function is that the coordination controller PMS schedules charging and discharging of the energy storage battery according to a set schedule curve.
8. The energy storage monitoring system according to claim 4, wherein the frequency and voltage adjusting function is that the coordination controller PMS adjusts the frequency and voltage of the power grid by controlling the charging and discharging power of the energy storage battery.
9. The energy storage monitoring system according to claim 4, wherein the fluctuation stabilizing function is that the coordination controller PMS stabilizes power fluctuation of power generation by controlling and coordinating charging and discharging of the energy storage battery.
10. The energy storage monitoring system according to claim 4, wherein the power distribution and SOC adjustment function is that the PMS controls the energy storage battery to control the SOC value of the energy storage battery within a certain range during charging and discharging.
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