CN111354991B - Battery maintenance system and method and micro-grid system capable of maintaining battery on line - Google Patents
Battery maintenance system and method and micro-grid system capable of maintaining battery on line Download PDFInfo
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- CN111354991B CN111354991B CN202010229125.7A CN202010229125A CN111354991B CN 111354991 B CN111354991 B CN 111354991B CN 202010229125 A CN202010229125 A CN 202010229125A CN 111354991 B CN111354991 B CN 111354991B
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- 238000012423 maintenance Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010248 power generation Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 15
- 238000011065 in-situ storage Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims 4
- 101150071172 PCS2 gene Proteins 0.000 description 11
- 238000005299 abrasion Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 230000009191 jumping Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a battery maintenance system, a method and a micro-grid system capable of maintaining batteries on line, which belong to the technical field of battery maintenance. The system comprises an EMS, a BMS, a modular PCS, a battery and a power generation device, wherein the power generation device supplies power to loads in a power grid; the battery absorbs redundant electric quantity in the power grid and discharges the electric quantity into the power grid when the electric quantity in the power grid is insufficient, and the battery comprises a plurality of battery clusters; the BMS collects state information of each battery cluster and uploads the state information to the EMS; the EMS judges whether each battery cluster needs maintenance according to the battery cluster state information uploaded by the BMS, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to a module PCS; and the module PCS performs maintenance operation on the appointed battery cluster according to the instruction of the EMS.
Description
Technical Field
The invention belongs to the technical field of battery maintenance, and particularly relates to a battery maintenance system and method and a micro-grid system capable of maintaining batteries on line.
Background
In some regions without power grids in the middle east, africa and southeast asia, in order to meet the domestic power demand of local people, a plurality of off-grid micro-grids with photovoltaic and energy storage (the power level of the system is generally not more than 500 KW) are usually built, and because the regions are usually far away, equipment maintenance is relatively inconvenient, equipment in the micro-grids usually adopts a system scheme of a series-connection type photovoltaic inverter and a modular PCS (power storage converter), and one energy storage converter comprises a plurality of sub-modules with the same power level so as to achieve the purpose of preventing power collapse of the micro-grids due to faults of single equipment.
In the micro-grid, after a period of use, the SOC state (charge state) of the battery is deviated from the SOC in the initial state due to the influence of the environmental temperature, charge and discharge power and other factors, so that the available capacity of the battery is reduced, the performance of the battery pack is affected, and at the moment, the battery needs to be recalibrated, the available capacity of the battery is restored, and maintenance of the battery is realized.
Currently, in a commonly used module type PCS (energy storage converter), the working modes thereof can be divided into a V/F mode (voltage source) and a P/Q mode (current source), when the micro-grid system normally supplies power to a load, all the sub-power modules in the PCS module work in the V/F mode to balance power fluctuation caused by photovoltaic output and load variation in the micro-grid system. When the battery needs to be maintained, the PCS module needs to be stopped from the V/F mode, is started after the working mode is switched to the P/Q mode, is connected into a power grid established by the diesel generator in the P/Q mode, and completes the maintenance of the battery under the scheduling of an EMS (energy management system).
With the current maintenance mode, two problems occur: 1) A micro-grid may experience a power interruption, which is unacceptable for some loads requiring an inability to interrupt power; 2) All batteries in the micro-grid must be maintained at the same time, the required maintenance power is large, and a diesel engine is required to be started to establish the power grid and balance the power fluctuation of the power grid during maintenance, so that the oil consumption and abrasion of the diesel engine are increased.
The reason why the PCS module cannot perform battery maintenance in the V/F mode is that in the V/F mode, the power and the current direction of the PCS module are completely determined by the actual load of the system, and the power of the PCS module is not scheduled by the EMS, so that if the battery SOC is not controlled, a situation occurs: at some point, the SOC of the battery has reached 100%, the battery has been full, and no more power is absorbed, and if the photovoltaic output is greater than the load demand, the PCS module will not be able to balance this excess power by charging the battery, which can cause the micro-grid to collapse due to over-frequency, which is also detrimental to certain loads that are sensitive to frequency. In order to ensure stable operation of the system, in the V/F mode, the difference between the photovoltaic output and the load demand needs to be controlled by the EMS to maintain the battery SOC within a certain range (e.g., 30% -80%). However, the battery cannot achieve the recalibration of the SOC through deep charge (SOC to 100%) and deep discharge (SOC to 0%).
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a battery maintenance system, a method and a micro-grid system capable of maintaining batteries on line, which can maintain one battery cluster of the batteries on line independently without switching all battery clusters out, thereby realizing the on-line maintenance of the batteries, and maintaining the stability and the electricity safety of the system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the battery maintenance system comprises an EMS, a BMS and a modular PCS, wherein the BMS collects state information of each battery cluster and uploads the state information to the EMS; the EMS judges whether each battery cluster needs maintenance according to the battery cluster state information uploaded by the BMS, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to a module PCS; and the module PCS performs maintenance operation on the appointed battery cluster according to the instruction of the EMS.
Further, the modular PCS comprises a PCS in-situ controller, wherein the PCS in-situ controller is in communication connection with a plurality of PCS modules, and each PCS module is in communication connection with one battery cluster; each PCS module is electrically connected with a power grid and one battery cluster respectively.
Further, the PCS local controller receives the working mode switching instruction sent by the EMS, and switches the working mode of the PCS module corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode according to the working mode switching instruction.
Further, when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging and SOC balancing are carried out on the battery cluster.
A micro-grid system capable of maintaining batteries on line comprises an EMS (energy management system), a BMS (battery management system), a modular PCS (personal communication System), batteries and a power generation device, wherein the power generation device supplies power to loads in a power grid; the battery absorbs redundant electric quantity in the power grid and discharges the electric quantity into the power grid when the electric quantity in the power grid is insufficient, and the battery comprises a plurality of battery clusters; the BMS collects state information of each battery cluster and uploads the state information to the EMS; the EMS judges whether each battery cluster needs maintenance according to the battery cluster state information uploaded by the BMS, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to a module PCS; and the module PCS performs maintenance operation on the appointed battery cluster according to the instruction of the EMS.
Further, the modular PCS comprises a PCS in-situ controller, wherein the PCS in-situ controller is in communication connection with a plurality of PCS modules, and each PCS module is in communication connection with one battery cluster; each PCS module is electrically connected with a power grid and one battery cluster respectively.
Further, the PCS local controller receives the working mode switching instruction sent by the EMS, and switches the working mode of the PCS module corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode according to the working mode switching instruction.
Further, when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging and SOC balancing are carried out on the battery cluster.
Further, the power generation device comprises a photovoltaic array, and the photovoltaic array is connected with a power grid through a photovoltaic inverter.
A battery maintenance method comprises the steps of,
Collecting state information of each battery cluster and uploading the state information to an EMS;
the EMS judges whether each battery cluster needs maintenance according to the state information of the battery cluster, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to the PCS local controller;
the PCS in-situ controller switches the working mode of the PCS module corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode;
And when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging and SOC balancing are carried out on the battery cluster.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the PCS local controller is used for switching the working mode of the PCS module corresponding to the battery cluster to be maintained from the V/F mode to the P/Q mode, so that the maintenance of one battery cluster is realized independently, the problem of power supply interruption of the power grid caused by the simultaneous maintenance of all battery clusters is avoided, and the requirement of uninterrupted power supply of important load is met;
(2) By reasonably setting maintenance strategies of the EMS, photovoltaic output and load management can be controlled to realize battery maintenance, a diesel engine is not required to be started to establish a power grid and balance power fluctuation, the diesel engine is restarted only under the condition of insufficient illumination resources or overload, the starting frequency of a diesel generator can be greatly reduced, and the oil cost and abrasion of the diesel engine are reduced.
Drawings
Fig. 1 is a schematic structural diagram of a micro-grid system capable of maintaining a battery online according to an embodiment of the present invention;
Fig. 2 is a schematic flow chart of battery maintenance work of a micro-grid system capable of maintaining batteries online according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
The battery maintenance system comprises an EMS (energy management system), a BMS (battery management system) and a module PCS (personal communication System), wherein the module PCS comprises a PCS in-situ controller which is in communication connection with a plurality of PCS modules, and each PCS module is in communication connection with one battery cluster; each PCS module is electrically connected with the power grid and one battery cluster respectively. The BMS collects state information of each battery cluster and uploads the state information to the EMS; the EMS judges whether each battery cluster needs maintenance according to the battery cluster state information uploaded by the BMS, when the maintenance conditions are met, the EMS sends an operating mode switching instruction to the PCS local controller, the PCS local controller receives the operating mode switching instruction sent by the EMS, and the operating mode of a PCS module corresponding to the battery cluster needing maintenance is switched from a V/F mode to a P/Q mode according to the operating mode switching instruction; and when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging, SOC balancing and other maintenance operations are carried out on the battery cluster.
The system differs in that: any one of the PCS modules in the modularized PCS can complete the switching of the working modes (V/F, P/Q) under the control of the PCS local controller, which means that the PCS modules in two different working modes can exist at the same time in the modularized PCS. Therefore, if the battery cluster under a certain PCS module needs to be maintained, the PCS module is only required to be switched from the V/F mode to the P/Q mode, then the battery maintenance operations such as deep charging, deep discharging and SOC balancing are carried out by receiving the power scheduling instruction of the EMS, and other PCS modules still continue to work in the V/F mode to balance the power fluctuation in the micro-grid, and after the battery maintenance is completed, the PCS module is switched back to the V/F mode from the P/Q mode.
Embodiment two:
As shown in fig. 1, based on the battery maintenance system of the first embodiment, the invention provides a micro-grid system capable of maintaining batteries on line, which comprises an EMS, a BMS, a modular PCS, batteries and a photovoltaic array, wherein the photovoltaic array is connected with a power grid through a photovoltaic inverter, and local loads in the parallel power grid supply power; the battery absorbs redundant electric quantity in the power grid and discharges the electric quantity to the power grid when the electric quantity in the power grid is insufficient, and the battery comprises a plurality of battery clusters; the module PCS comprises a PCS local controller, the PCS local controller is in communication connection with n PCS modules, and each PCS module is in communication connection with one battery cluster; each PCS module is electrically connected with the power grid and one battery cluster respectively. The BMS collects state information of each battery cluster and uploads the state information to the EMS; the EMS judges whether each battery cluster needs maintenance according to the battery cluster state information uploaded by the BMS, when the maintenance conditions are met, the EMS sends an operating mode switching instruction to the PCS local controller, the PCS local controller receives the operating mode switching instruction sent by the EMS, and the operating mode of a PCS module corresponding to the battery cluster needing maintenance is switched from a V/F mode to a P/Q mode according to the operating mode switching instruction; and when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging, SOC balancing and other maintenance operations are carried out on the battery cluster. According to the embodiment, the working mode of the PCS module corresponding to the battery cluster to be maintained is switched from the V/F mode to the P/Q mode through the PCS local controller, so that the maintenance of one battery cluster alone is realized, the problem of power supply interruption of a power grid caused by the simultaneous maintenance of all the battery clusters is avoided, and the requirement of uninterrupted power supply of important loads is met.
As shown in fig. 2, the flow chart of the battery maintenance work in this embodiment is shown:
Step1, EMS reads battery state information (information such as SOC) uploaded by BMS;
step2, the EMS judges whether maintenance is needed for a certain battery cluster, and if so, the EMS enters a battery maintenance flow Step4; if maintenance is not needed, jumping to Step10;
step3, the EMS comprehensively judges whether the battery maintenance condition can be met according to the load and the output condition of each power supply, if so, battery maintenance is started, and Step4 is performed; otherwise, jumping to Step10;
Step4, the EMS sends a working mode switching instruction to the PCS local controller, and the PCS local controller switches the working mode of a PCS module (taking PCS2 as an example) corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode.
Step5, EMS sends charge/discharge current command to PCS2 module according to the current charge current limit/discharge current limit of the battery cluster uploaded by BMS and PCS2 module carries out deep charge/deep discharge to the battery cluster according to the command;
Step6, in a battery maintenance mode, whether the battery is deeply charged or deeply discharged is determined by the SOC state of the battery cluster (such as SOC >80%, deep discharge is firstly performed, and if SOC <20%, deep charge is firstly performed); taking the deep charging of the battery as an example, the whole process comprises deep charging, deep discharging and SOC balancing; if the battery is deeply placed, the whole process is deep placement, deep charging and SOC balance;
The judgment logic is as follows:
1) The EMS reads state information such as the SOC uploaded by the BMS, judges whether the battery is completely charged deeply, and if the battery is not completely charged, maintains the charging state; if the deep charge is completed, an instruction is sent to the PCS2 module through the PCS local controller, and the PCS2 module is converted from a charging state to a discharging state. The EMS simultaneously transmits the discharge current limit value uploaded by the BMS to the PCS2 module, and the PCS2 module executes a discharge mode;
2) And the EMS reads the information such as the SOC uploaded by the BMS, judges whether the deep discharging process of the battery is finished, and maintains the discharging state if the deep discharging process of the battery is not finished. If the deep discharging is finished, an instruction is sent to the PCS2 module through the PCS local controller, the PCS2 module converts the discharging state into the charging state, and at the moment, the SOC recalibration of the battery cluster is finished; maintaining the battery cluster to enter an SOC balance mode;
Step7, the EMS comprehensively judges whether the battery maintenance condition can be met according to the load and the output condition of each power supply, if yes, the Step8 is entered to start the battery SOC balancing operation, otherwise, the Step10 is skipped;
Step8, SOC equalization: the EMS sends a charging/discharging instruction to the PCS2 module through the PCS local controller, so that the PCS2 module performs charging and discharging operation on the maintenance battery cluster, and the SOC of the battery cluster is restored to be basically consistent with that of other battery clusters;
Step9, judging whether the SOC equalization is finished, reading the SOC information of each battery cluster uploaded by the BMS by the EMS, comparing the SOC of the maintenance battery cluster with the SOC average value of all the battery clusters, if the absolute value of the difference value is smaller than a set threshold value, finishing the maintenance of the battery clusters, and entering Step10; if not, jumping to Step8;
step10, reading the working mode of the PCS module, if the working mode is the P/Q mode, transmitting a working state switching instruction to the PCS by the EMS, and converting the PCS into the V/F mode;
step11. Exit battery maintenance mode.
Along with the progress of the charging and discharging processes, the allowable charging and discharging currents of the battery also change, and updated current limit values in all the charging and discharging processes are uploaded to the EMS by the BMS and then issued to the PCS by the EMS to be executed. According to the embodiment, through reasonably setting the maintenance strategy of the EMS, the photovoltaic output and the load management can be controlled to realize battery maintenance, a diesel generator is not required to be started to establish a power grid and balance power fluctuation, the diesel generator is only restarted under the condition of insufficient illumination resources or overload, the starting frequency of the diesel generator can be greatly reduced, and the oil consumption cost and abrasion of a diesel engine are reduced.
Embodiment III:
based on the above embodiments, the present invention provides a battery maintenance method, comprising,
Collecting state information of each battery cluster and uploading the state information to an EMS;
the EMS judges whether each battery cluster needs maintenance according to the state information of the battery cluster, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to the PCS local controller;
the PCS in-situ controller switches the working mode of the PCS module corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode;
And when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging and SOC balancing are carried out on the battery cluster.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (3)
1. A battery maintenance system under the off-grid operation condition of an optical storage micro-grid is characterized by comprising an EMS, a BMS and a modular PCS,
The BMS collects state information of each battery cluster and uploads the state information to the EMS;
The EMS judges whether each battery cluster needs maintenance according to the battery cluster state information uploaded by the BMS, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to a module PCS;
the module PCS performs maintenance operation on the appointed battery cluster according to the instruction of the EMS;
The module type PCS comprises a PCS local controller, wherein the PCS local controller is in communication connection with a plurality of PCS modules, and each PCS module is in communication connection with one battery cluster; each PCS module is electrically connected with a power grid and a battery cluster respectively;
the PCS local controller receives the working mode switching instruction sent by the EMS and switches the working mode of the PCS module corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode according to the working mode switching instruction;
And when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging and SOC balancing are carried out on the battery cluster.
2. The micro-grid system capable of maintaining the battery on line is characterized in that the micro-grid system is a micro-grid system under the off-grid operation condition of an optical storage micro-grid, and comprises an EMS (energy management system), a BMS (battery management system), a modular PCS (personal communication System), a battery and a power generation device, wherein the power generation device supplies power to a load in the power grid;
The battery absorbs redundant electric quantity in the power grid and discharges the electric quantity into the power grid when the electric quantity in the power grid is insufficient, and the battery comprises a plurality of battery clusters;
The BMS collects state information of each battery cluster and uploads the state information to the EMS;
The EMS judges whether each battery cluster needs maintenance according to the battery cluster state information uploaded by the BMS, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to a module PCS;
the module PCS performs maintenance operation on the appointed battery cluster according to the instruction of the EMS;
The module type PCS comprises a PCS local controller, wherein the PCS local controller is in communication connection with a plurality of PCS modules, and each PCS module is in communication connection with one battery cluster; each PCS module is electrically connected with a power grid and a battery cluster respectively;
the PCS local controller receives the working mode switching instruction sent by the EMS and switches the working mode of the PCS module corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode according to the working mode switching instruction;
When the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging and SOC balancing are carried out on the battery cluster;
The power generation device comprises a photovoltaic array, and the photovoltaic array is connected with a power grid through a photovoltaic inverter.
3. A battery maintenance method under the off-grid operation condition of an optical storage micro-grid, which is characterized in that based on the battery maintenance system under the off-grid operation condition of the optical storage micro-grid as claimed in claim 1, the method comprises,
Collecting state information of each battery cluster and uploading the state information to an EMS;
the EMS judges whether each battery cluster needs maintenance according to the state information of the battery cluster, and when the maintenance conditions are met, the EMS sends a working mode switching instruction to the PCS local controller;
the PCS in-situ controller switches the working mode of the PCS module corresponding to the battery cluster to be maintained from a V/F mode to a P/Q mode;
And when the maintenance condition is met and the working mode of the PCS module is in the P/Q mode, deep charging, deep discharging and SOC balancing are carried out on the battery cluster.
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