CN116231771A - Control method of reconfigurable battery energy storage system and energy storage system - Google Patents
Control method of reconfigurable battery energy storage system and energy storage system Download PDFInfo
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Business, Economics & Management (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a reconfigurable battery energy storage system, which adopts a plurality of low-voltage direct-current battery modules with end voltage working voltage ranges capable of being flexibly controlled on line, and the low-voltage direct-current battery modules are connected in series in a direct-current cascading mode to form a direct-current cascading group string of the low-voltage direct-current battery modules; when the battery energy storage management and control system monitors a low-voltage direct-current battery module of an abnormal battery monomer, cutting the low-voltage direct-current battery module; meanwhile, the output voltage range of the redundant standby low-voltage direct-current battery module is regulated and controlled to be the corresponding voltage range of the cut-out module; and when the redundant spare low-voltage direct-current battery modules are not available, the terminal voltage of each low-voltage direct-current battery module in normal operation is controlled and regulated, the corresponding voltage of the cut-out module is shared, the terminal voltage of the direct-current cascade group string of the low-voltage direct-current battery modules is kept, the working range of the direct-current side voltage of the energy storage converter is continuously met, seamless uninterrupted power supply is ensured, flexible regulation of the battery string is completed, and the reconfigurable battery energy storage system is controlled and realized, so that the method is an effective solution for high-efficiency utilization and improvement of benefits of the energy storage system.
Description
Technical Field
The invention belongs to the technical field of battery energy storage, and particularly relates to a control method of a reconfigurable battery energy storage system and the energy storage system.
Background
The battery energy storage system is characterized in that a plurality of battery cells and a battery pack are connected in series to form a battery pack string, and the battery pack string is connected into an energy storage converter. Therefore, the abnormal battery cells and the battery pack string package must be timely isolated or maintained online, so that the safe and normal operation of the battery energy storage system is ensured, and the effective online dynamic isolation of the abnormal battery cells and the battery pack string package is one of the key technologies of the battery energy storage system.
The prior solution is to disconnect the battery string as a whole or stop the operation of the energy storage converter when abnormal battery cells and battery string packages are present. The operation utilization rate of the energy storage system is reduced, the investment benefit is reduced, and the short-plate effect of the energy storage system is formed. The method can safely and reliably isolate and cut out the minimum unit of the abnormal battery cell and the battery pack string pack in time without affecting the normal operation of the whole energy storage unit system, and is an effective solution for ensuring the high-efficiency utilization of the energy storage system and improving the investment income.
The method has the main difficulties that the DC side operation of the energy storage converter needs to meet the set voltage working range, meanwhile, the voltages of the battery cell and the battery pack are considered to be within a specified certain range, and the voltage working range of the battery and the battery pack needs to be met, and meanwhile, the voltage working range needed on the DC side of the energy storage converter is met. Because the voltage of the battery monomer and the battery pack string pack is relatively fixed in the charge and discharge process, the voltage range of the end of the battery pack string formed by the battery monomer and the battery pack string pack is correspondingly fixed; when the abnormal battery cells and the battery pack string packages are isolated and cut out, the voltage range of the battery pack string ends is reduced, and to keep the original designed direct-current voltage working range of the energy storage converter, the redundant battery cells and the battery pack string packages are required to be configured and subjected to seamless switching and replacement, or the voltage ranges of the battery cells and the battery pack string packages can be adjusted to realize flexible adjustment of the battery pack string end voltage, and after the abnormal battery cells and the battery pack string packages are cut out, the end voltage of the battery pack string is still kept to meet the direct-current voltage working range required by the operation of the energy storage converter.
Meanwhile, the problem that the replacement of the battery monomer and the battery pack needs seamless uninterrupted power supply is solved, otherwise, the energy storage system stops running due to direct current power failure. On-line regulation and removal of abnormal battery cells and battery string packages and maintenance of battery string end voltage are necessary conditions for guaranteeing flexible reconstruction of the battery string. In the process of replacing abnormal battery cells and battery pack strings, the running and voltage states of each battery cell and battery pack string are different or run under different parameter settings due to inconsistency and personalized treatment in the running process, so that the corresponding voltages of the cut abnormal battery cells and battery pack strings are required to be distributed to other normal battery cells and battery pack strings as required, and reasonable running control parameters of each battery cell and battery pack string are ensured.
Disclosure of Invention
In order to effectively solve the problems and key technologies, the invention provides a control method of a reconfigurable battery energy storage system and the energy storage system, which are characterized in that the battery energy storage control system controls the voltage range of the output ends of DCDC modules of a plurality of low-voltage DC battery modules in a DC cascade group string of the low-voltage DC battery modules, and the end voltage of the DC cascade group string of the low-voltage DC battery modules is regulated through on-line flexible regulation so as to meet the voltage working voltage range of the DC side of an energy storage converter, and the battery energy storage system is reconfigured in real time; the control method and the flow are as follows:
s1: the battery energy storage management and control system monitors the voltage, temperature and electric quantity real-time parameters of the operation of the battery unit through the battery monitoring circuit, and regulates and controls the terminal voltage of the direct-current cascade strings of each low-voltage direct-current battery module so as to meet the voltage working range of the direct-current side of the energy storage converter;
s2: the battery energy storage management and control system monitors and finds out a battery monomer with abnormal operation parameters according to the battery operation parameters of the low-voltage direct-current battery module, and then S3 is executed; the method comprises the steps that S1 is executed if no battery monomer with abnormal operation parameters is found;
s3: sending an instruction to control the output end voltage of a DCDC module in the low-voltage direct-current battery module which correspondingly generates abnormal battery monomers to be 0V, namely bypass conduction is realized, and the abnormal battery monomers and the battery pack string package are isolated or cut;
s4: the battery energy storage management and control system checks whether a redundant standby low-voltage direct-current battery module exists in the corresponding current low-voltage direct-current battery module direct-current cascade group string, and if yes, S5 is executed; if not, executing S6;
s5: the battery energy storage management and control system sends an instruction to control the terminal voltage of the corresponding redundant standby low-voltage direct-current battery module to replace the output terminal voltage value of the DCDC module when the low-voltage direct-current battery module for generating abnormal battery monomers is cut out, and the S1 is switched;
s6: controlling the voltage values of the low-voltage direct-current battery modules where the cut abnormal battery monomers and battery pack strings are located, distributing the voltage values to each low-voltage direct-current battery module in the corresponding low-voltage direct-current battery module direct-current cascade group string, regulating and executing corresponding output end voltage and added value by the DCDC module of each low-voltage direct-current battery module, maintaining the voltage of the corresponding low-voltage direct-current battery module direct-current cascade group string end, continuously meeting the voltage working range of the direct-current side of the energy storage converter, and ensuring the normal and safe operation of the battery energy storage system; turning to S1.
The control method of the reconfigurable battery energy storage system and the energy storage system are characterized in that a battery monomer and a battery pack connected with a battery monitoring circuit are connected into the input ends of a DCDC module respectively through an anode switch and a protection circuit and a cathode switch and the protection circuit to form a low-voltage DC battery module, and the anode output ends of the DCDC modules of a plurality of low-voltage DC battery modules are connected with the cathode output ends of the DCDC modules of adjacent low-voltage DC battery modules in series to form a low-voltage DC battery module direct-current cascade string meeting the voltage working range of the direct current side of an energy storage converter; and at least one or a plurality of low-voltage direct-current battery modules are connected in series with an energy storage converter in a direct-current cascade group to form a battery energy storage unit system.
The control method of the reconfigurable battery energy storage system and the energy storage system are characterized in that the end voltage working range of the low-voltage direct-current battery module direct-current cascade group string is always kept to be smaller than or equal to the direct-current side voltage working range of the energy storage converter.
The control method of the reconfigurable battery energy storage system and the energy storage system are characterized in that a corresponding battery monitoring circuit in each low-voltage direct-current battery module is connected with the battery energy storage control system through a battery control communication line to form a monitoring path of the battery energy storage system.
The control method of the reconfigurable battery energy storage system and the energy storage system are characterized in that each low-voltage direct-current battery module is in direct-current cascade connection group string, is formed by connecting a plurality of low-voltage direct-current battery modules in series, and is provided with or added with redundant standby low-voltage direct-current battery modules; the control method is that the output voltage of the redundant standby low-voltage direct-current battery module is controlled to be 0V voltage, namely bypass conduction is realized, when the low-voltage direct-current battery module of an abnormal battery monomer is cut off, the voltage of the low-voltage direct-current battery module is regulated and controlled to be a corresponding voltage value of the low-voltage direct-current battery module for replacing the abnormal battery monomer, the terminal voltage range of the direct-current cascade string of the low-voltage direct-current battery module is kept, and the working range of the direct-current side voltage of the energy storage converter is met.
The control method of the reconfigurable battery energy storage system and the energy storage system are characterized in that a battery monitoring circuit is connected with each battery cell of a battery cell and a battery pack string pack through a battery monitoring sampling wire harness, monitors voltage and temperature parameters of the battery cell in real time, is connected with a DCDC module through a battery parameter information communication line, and is connected with the battery energy storage management and control system through a battery management and control communication line.
The invention relates to a control method of a reconfigurable battery energy storage system and an energy storage system, wherein a plurality of low-voltage direct-current battery modules which can be flexibly controlled on line in a terminal voltage working voltage range are adopted, and are connected in series in a direct-current cascading mode to form a direct-current cascading group string of the low-voltage direct-current battery modules; when the battery energy storage management and control system monitors a low-voltage direct-current battery module of an abnormal battery monomer, cutting the low-voltage direct-current battery module; meanwhile, the output voltage range of the redundant standby low-voltage direct-current battery module is regulated and controlled to be the corresponding voltage range of the low-voltage direct-current battery module for replacing the abnormal battery monomer; and when the redundant standby low-voltage direct-current battery modules do not exist, the terminal voltage of each low-voltage direct-current battery module in normal operation is controlled and regulated, the corresponding voltage of the low-voltage direct-current battery module of the abnormal battery cells is shared, the terminal voltage of the direct-current cascade group string of the low-voltage direct-current battery modules is kept, the working range of the direct-current side voltage of the energy storage converter is continuously met, the abnormal battery cells and the battery group string package are cut off on line, the battery group string terminal voltage is maintained, seamless uninterrupted power supply is ensured, the flexible regulation of the battery group string is completed, and the reconfigurable battery energy storage system is controlled and realized, so that the method is an effective solution for ensuring the high-efficiency utilization of the energy storage system and improving the investment income.
Drawings
FIG. 1 is a control method and flow chart of a reconfigurable battery energy storage system.
Fig. 2 is a schematic block diagram of a reconfigurable battery energy storage system.
Fig. 3 is a schematic block diagram of a low voltage dc battery module of a reconfigurable battery energy storage system.
Detailed Description
As an example of implementation, a method and system for controlling a reconfigurable battery energy storage system are described with reference to the accompanying drawings, but the described embodiments are some, but not all, embodiments of the invention applied to a method and system for controlling a reconfigurable battery energy storage system. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The technique and scheme of the present invention are not limited to those given in the present embodiment example.
1-2, a control method of a reconfigurable battery energy storage system and the energy storage system are characterized in that the battery energy storage control system (4) controls the voltage range of the output ends of DCDC modules (11) of a plurality of low-voltage direct-current battery modules (1) of a low-voltage direct-current battery module direct-current cascade group string (6), and the end voltage of the low-voltage direct-current battery module direct-current cascade group string (6) is regulated to meet the voltage working range of the direct-current side of an energy storage converter (3) through on-line flexible regulation, so that the battery energy storage system is reconfigured in real time; the control method and the flow are as follows:
s1: the battery energy storage management and control system (4) monitors the voltage, temperature and electric quantity real-time parameters of the operation of the battery unit through the battery monitoring circuit (13) and regulates and controls the terminal voltage of each low-voltage direct-current battery module direct-current cascade group string (6) so as to meet the voltage working range of the direct-current side of the energy storage converter (3);
s2: the battery energy storage management and control system (4) monitors and finds out a battery monomer with abnormal operation parameters according to the battery operation parameters of the low-voltage direct-current battery module (1), and executes S3; the method comprises the steps that S1 is executed if no battery monomer with abnormal operation parameters is found;
s3: sending an instruction to control the output end voltage of a DCDC module (11) in a low-voltage direct-current battery module (7) which correspondingly generates abnormal battery monomers to be 0V, namely bypass conduction, and isolating or cutting out the abnormal battery monomers and a battery pack string pack (12);
s4: the battery energy storage management and control system (4) checks whether a redundant spare low-voltage direct-current battery module (8) exists in the corresponding low-voltage direct-current battery module direct-current cascade group string (6), and if yes, S5 is executed; if not, executing S6;
s5: the battery energy storage management and control system (4) sends an instruction to control the terminal voltage of the corresponding redundant standby low-voltage direct-current battery module (8) to replace the output terminal voltage value of the DCDC module (11) when the low-voltage direct-current battery module (7) for generating abnormal battery cells is cut out, and the S1 is changed;
s6: controlling the voltage values of the low-voltage direct-current battery modules (1) where the cut abnormal battery monomers and battery pack string packages (12) are located, distributing the voltage values to the low-voltage direct-current battery modules (1) in the corresponding low-voltage direct-current battery module direct-current cascade string (6), regulating and executing corresponding output end voltage increasing values by the DCDC module (11) of each low-voltage direct-current battery module (1), and keeping the voltage of the end of the corresponding low-voltage direct-current battery module direct-current cascade string (6) to meet the voltage working range of the direct-current side of the energy storage converter (3), so as to ensure the normal and safe operation of a battery energy storage system; turning to S1.
As shown in fig. 2, the control method of a reconfigurable battery energy storage system and the energy storage system are characterized in that a battery unit and a battery pack string pack (12) connected with a battery monitoring circuit (13) are respectively connected to an input end of a DCDC module (11) through a positive switch and protection circuit (14) and a negative switch and protection circuit (15) to form a low-voltage direct-current battery module (1), and positive output ends (17) of the DCDC modules (11) of a plurality of low-voltage direct-current battery modules (1) are connected in series with negative output ends (18) of the DCDC modules (11) of adjacent low-voltage direct-current battery modules (1) to form a low-voltage direct-current battery module direct-current cascade string (6) meeting the direct-current side voltage working range of an energy storage converter (3); and at least one or a plurality of low-voltage direct-current battery module direct-current cascade strings (6) are connected into the energy storage converter (3) to form a battery energy storage unit system.
The control method of the reconfigurable battery energy storage system and the energy storage system are characterized in that the end voltage working range of the low-voltage direct-current battery module direct-current cascade group string (6) is always kept to be smaller than or equal to the direct-current side voltage working range of the energy storage converter (3).
As shown in fig. 2, the control method of a reconfigurable battery energy storage system and the energy storage system are characterized in that a corresponding battery monitoring circuit (13) in each low-voltage direct-current battery module (1) is connected with a battery energy storage control system (4) through a battery control communication line (5) to form a monitoring path of the battery energy storage system.
As shown in fig. 2, the control method of a reconfigurable battery energy storage system and the energy storage system are characterized in that each low-voltage direct-current battery module direct-current cascade group string (6) is formed by connecting a plurality of low-voltage direct-current battery modules (1) in series, and redundant standby low-voltage direct-current battery modules (8) are arranged or added; the control method is that the output voltage of the redundant standby low-voltage direct-current battery module (8) is 0V, namely bypass conduction is realized, when the low-voltage direct-current battery module (7) of an abnormal battery monomer is cut off, the voltage is set to be a corresponding voltage value of the low-voltage direct-current battery module (7) for replacing the abnormal battery monomer, the terminal voltage range of the low-voltage direct-current battery module direct-current cascade group string (6) is kept, and the working range of the direct-current side voltage of the energy storage converter (3) is met.
As shown in fig. 3, the control method of the reconfigurable battery energy storage system and the energy storage system are characterized in that the low-voltage direct-current battery module (1) is connected with each battery cell of the battery cell and the battery pack string pack (12) through a battery monitoring sampling wire harness (16) by a battery monitoring circuit (13), monitors the voltage and temperature parameters of the battery cell in real time, is connected with the DCDC module (11) through a battery parameter information communication wire (19), and is connected with the battery energy storage management and control system (4) through a battery management and control communication wire (5).
The invention relates to a control method of a reconfigurable battery energy storage system and an energy storage system, wherein a plurality of low-voltage direct-current battery modules which can be flexibly controlled on line in a terminal voltage working voltage range are adopted, and are connected in series in a direct-current cascading mode to form a direct-current cascading group string of the low-voltage direct-current battery modules; when the battery energy storage management and control system monitors a low-voltage direct-current battery module of an abnormal battery monomer, cutting the low-voltage direct-current battery module; meanwhile, the output voltage range of the redundant standby low-voltage direct-current battery module is regulated and controlled to be the corresponding voltage range of the low-voltage direct-current battery module for replacing the abnormal battery monomer; and when the redundant standby low-voltage direct-current battery modules do not exist, the terminal voltage of each low-voltage direct-current battery module in normal operation is controlled and regulated, the corresponding voltage of the low-voltage direct-current battery module of the abnormal battery cells is shared, the terminal voltage of the direct-current cascade group string of the low-voltage direct-current battery modules is kept, the working range of the direct-current side voltage of the energy storage converter is continuously met, the abnormal battery cells and the battery group string package are cut off on line, the battery group string terminal voltage is maintained, seamless uninterrupted power supply is ensured, the flexible regulation of the battery group string is completed, and the reconfigurable battery energy storage system is controlled and realized, so that the method is an effective solution for ensuring the high-efficiency utilization of the energy storage system and improving the investment income.
Claims (6)
1. The control method is characterized in that the battery energy storage control system controls the voltage range of the output ends of the DCDC modules of a plurality of low-voltage direct-current battery modules in the direct-current cascade group strings of the low-voltage direct-current battery modules, and the end voltage of the direct-current cascade group strings of the low-voltage direct-current battery modules is regulated through on-line flexible regulation so as to meet the voltage working voltage range of the direct-current side of the energy storage converter, so that the battery energy storage system is reconstructed in real time; the control method and the flow are as follows:
s1: the battery energy storage management and control system monitors the voltage, temperature and electric quantity real-time parameters of the operation of the battery unit through the battery monitoring circuit, and regulates and controls the terminal voltage of the direct-current cascade strings of each low-voltage direct-current battery module so as to meet the voltage working range of the direct-current side of the energy storage converter;
s2: the battery energy storage management and control system monitors and finds out a battery monomer with abnormal operation parameters according to the battery operation parameters of the low-voltage direct-current battery module, and then S3 is executed; the method comprises the steps that S1 is executed if no battery monomer with abnormal operation parameters is found;
s3: sending an instruction to control the output end voltage of a DCDC module in the low-voltage direct-current battery module which correspondingly generates abnormal battery monomers to be 0V, namely bypass conduction is realized, and the abnormal battery monomers and the battery pack string package are isolated or cut;
s4: the battery energy storage management and control system checks whether a redundant standby low-voltage direct-current battery module exists in the corresponding current low-voltage direct-current battery module direct-current cascade group string, and if yes, S5 is executed; if not, executing S6;
s5: the battery energy storage management and control system sends an instruction to control the terminal voltage of the corresponding redundant standby low-voltage direct-current battery module to replace the output terminal voltage value of the DCDC module when the low-voltage direct-current battery module for generating abnormal battery monomers is cut out, and the S1 is switched;
s6: controlling the voltage values of the low-voltage direct-current battery modules where the cut abnormal battery monomers and battery pack strings are located, distributing the voltage values to each low-voltage direct-current battery module in the corresponding low-voltage direct-current battery module direct-current cascade group string, regulating and executing corresponding output end voltage and added value by the DCDC module of each low-voltage direct-current battery module, maintaining the voltage of the corresponding low-voltage direct-current battery module direct-current cascade group string end, continuously meeting the voltage working range of the direct-current side of the energy storage converter, and ensuring the normal and safe operation of the battery energy storage system; turning to S1.
2. The control method of the reconfigurable battery energy storage system and the energy storage system according to claim 1, wherein a battery unit and a battery pack connected with a battery monitoring circuit are connected to the input ends of the DCDC modules respectively through an anode switch and a protection circuit and a cathode switch and a protection circuit to form a low-voltage direct-current battery module, and the anode output ends of the DCDC modules of a plurality of low-voltage direct-current battery modules are connected in series with the cathode output ends of the DCDC modules of adjacent low-voltage direct-current battery modules to form a low-voltage direct-current battery module direct-current cascade group string meeting the direct-current side voltage working range of the energy storage converter; and at least one or a plurality of low-voltage direct-current battery modules are connected in series with an energy storage converter in a direct-current cascade group to form a battery energy storage unit system.
3. The method for controlling an energy storage system of a reconfigurable battery according to claim 1, wherein a terminal voltage operating range of a dc cascade string of low-voltage dc battery modules is always kept equal to or less than a dc side voltage operating range of an energy storage converter.
4. The method for controlling a reconfigurable battery energy storage system and the energy storage system according to claims 1-2, wherein the corresponding battery monitoring circuit in each low-voltage direct-current battery module is connected with the battery energy storage control system through a battery control communication line to form a monitoring path of the battery energy storage system.
5. The method for controlling a reconfigurable battery energy storage system and the energy storage system according to claims 1-2, wherein each low-voltage direct-current battery module is a direct-current cascade group string composed of a plurality of low-voltage direct-current battery modules connected in series, and a redundant standby low-voltage direct-current battery module is arranged or added; the control method is that the output voltage of the redundant standby low-voltage direct-current battery module is controlled to be 0V voltage, namely bypass conduction is realized, when the low-voltage direct-current battery module of an abnormal battery monomer is cut off, the voltage of the low-voltage direct-current battery module is regulated and controlled to be a corresponding voltage value of the low-voltage direct-current battery module for replacing the abnormal battery monomer, the terminal voltage range of the direct-current cascade string of the low-voltage direct-current battery module is kept, and the working range of the direct-current side voltage of the energy storage converter is met.
6. The method for controlling a reconfigurable battery energy storage system and the energy storage system according to claims 1-2, wherein the low voltage dc battery module is connected to each battery cell of the battery cell and the battery pack string by a battery monitoring circuit through a battery monitoring sampling harness, monitors voltage and temperature parameters of the battery cell in real time, is connected to the DCDC module through a battery parameter information communication line, and is connected to the battery energy storage management and control system through a battery management and control communication line.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116455048A (en) * | 2023-06-14 | 2023-07-18 | 宁德时代新能源科技股份有限公司 | Redundant power supply circuit and power supply device |
| CN116937742A (en) * | 2023-07-25 | 2023-10-24 | 浙江大学 | Double frequency ripple current suppression circuit and method based on reconfigurable battery system |
-
2021
- 2021-12-06 CN CN202111472856.5A patent/CN116231771A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116455048A (en) * | 2023-06-14 | 2023-07-18 | 宁德时代新能源科技股份有限公司 | Redundant power supply circuit and power supply device |
| CN116455048B (en) * | 2023-06-14 | 2024-05-31 | 宁德时代新能源科技股份有限公司 | Redundant power supply circuit and power supply device |
| CN116937742A (en) * | 2023-07-25 | 2023-10-24 | 浙江大学 | Double frequency ripple current suppression circuit and method based on reconfigurable battery system |
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