CN115473265A - Battery energy storage circuit and system - Google Patents

Battery energy storage circuit and system Download PDF

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Publication number
CN115473265A
CN115473265A CN202211084100.8A CN202211084100A CN115473265A CN 115473265 A CN115473265 A CN 115473265A CN 202211084100 A CN202211084100 A CN 202211084100A CN 115473265 A CN115473265 A CN 115473265A
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CN
China
Prior art keywords
energy storage
bridge arm
voltage
inductor
storage bridge
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Pending
Application number
CN202211084100.8A
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Chinese (zh)
Inventor
彭鹏
陈满
李毓烜
叶复萌
李勇琦
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Energy Storage Research Institute Of China Southern Power Grid Peak Regulation And Frequency Regulation Power Generation Co ltd
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Energy Storage Research Institute Of China Southern Power Grid Peak Regulation And Frequency Regulation Power Generation Co ltd
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Publication date
Application filed by Energy Storage Research Institute Of China Southern Power Grid Peak Regulation And Frequency Regulation Power Generation Co ltd filed Critical Energy Storage Research Institute Of China Southern Power Grid Peak Regulation And Frequency Regulation Power Generation Co ltd
Priority to CN202211084100.8A priority Critical patent/CN115473265A/en
Publication of CN115473265A publication Critical patent/CN115473265A/en
Priority to LU505599A priority patent/LU505599B1/en
Priority to PCT/CN2023/097005 priority patent/WO2024051217A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4833—Capacitor voltage balancing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to a battery energy storage circuit, which comprises a first voltage stabilization bridge arm, a second voltage stabilization bridge arm, a first phase cluster, a second phase cluster and a third phase cluster, wherein the first end of the first voltage stabilization bridge arm is used for being connected with the first end of a direct current power grid; the first end of the second voltage-stabilizing bridge arm is respectively connected with the second end of the first voltage-stabilizing bridge arm and a neutral line of the three-phase alternating current power grid, and the second end of the second voltage-stabilizing bridge arm is used for being connected with the second end of the direct current power grid; the first phase cluster comprises a first energy storage bridge arm and a second energy storage bridge arm; the second phase cluster comprises a third energy storage bridge arm and a fourth energy storage bridge arm; and the third phase cluster comprises a fifth energy storage bridge arm and a sixth energy storage bridge arm. In the battery energy storage circuit, the first voltage stabilization bridge arm and the second voltage stabilization bridge arm are arranged, so that the output voltage of a direct current power grid end can be stabilized, and a stable reference voltage can be provided through the middle points of the first voltage stabilization bridge arm and the second voltage stabilization bridge arm, so that a stable neutral point is provided for a rear-stage alternating current power grid, and the battery energy storage circuit meets the operation requirement of a three-phase four-wire power grid.

Description

Battery energy storage circuit and system
Technical Field
The present disclosure relates to electronic circuits, and particularly to a battery energy storage circuit and system.
Background
The battery energy storage is a technology which is rapidly developed in recent years, and the battery energy storage technology has various routes, such as a voltage grid-connected two-level battery energy storage system, a medium-voltage grid-connected three-level battery energy storage system and a modular battery energy storage system which can realize grid connection from low voltage to high voltage. The modular battery energy storage system avoids direct large-scale series connection of a power switch device and an energy storage battery, has strong expandability, good output electric energy quality and easy maintenance of modularization, and the modular Multi-Level Converter-MMC (modular Multi-Level Converter-MMC) battery energy storage system is one of the most important application forms.
At present, a modular multilevel energy storage system usually has a three-phase three-wire structure formed by 6 bridge arms, can only operate in a three-phase three-wire mode, and cannot be directly applied to occasions requiring three-phase four-wire alternating current grid connection/power supply, so that the research on the modular multilevel energy storage system capable of being applied to a three-phase alternating current power grid becomes a problem to be solved urgently.
Disclosure of Invention
Therefore, it is necessary to provide a battery energy storage circuit and a battery energy storage system to solve the problem that the conventional three-phase three-wire energy storage system cannot be applied to the three-phase four-wire grid connection/power supply situation.
One aspect of the present application provides a battery energy storage circuit, including:
the first end of the first voltage stabilization bridge arm is used for being connected with the first end of a direct current power grid;
a first end of the second voltage stabilization bridge arm is respectively connected with a second end of the first voltage stabilization bridge arm and a neutral line of a three-phase alternating current power grid, and the second end of the second voltage stabilization bridge arm is used for being connected with a second end of the direct current power grid;
the first phase cluster comprises a first energy storage bridge arm and a second energy storage bridge arm, wherein the first end of the first energy storage bridge arm is used for being connected with the first end of the direct-current power grid, the second end of the first energy storage bridge arm is respectively connected with the first end of the second energy storage bridge arm and the first phase line of the three-phase alternating-current power grid, and the second end of the second energy storage bridge arm is used for being connected with the second end of the direct-current power grid;
the second phase cluster comprises a third energy storage bridge arm and a fourth energy storage bridge arm, wherein the first end of the third energy storage bridge arm is used for being connected with the first end of the direct-current power grid, the second end of the third energy storage bridge arm is respectively connected with the first end of the fourth energy storage bridge arm and a second phase line of the three-phase alternating-current power grid, and the second end of the fourth energy storage bridge arm is used for being connected with the second end of the direct-current power grid;
and the third phase cluster comprises a fifth energy storage bridge arm and a sixth energy storage bridge arm, the first end of the fifth energy storage bridge arm is used for being connected with the first end of the direct-current power grid, the second end of the fifth energy storage bridge arm is respectively connected with the first end of the sixth energy storage bridge arm and the third phase line of the three-phase alternating-current power grid, and the second end of the sixth energy storage bridge arm is used for being connected with the second end of the direct-current power grid.
In the battery energy storage circuit described in the above embodiment, by providing the first voltage stabilization bridge arm and the second voltage stabilization bridge arm, on one hand, the output voltage of the direct current power grid end can be stabilized, and on the other hand, a stable reference voltage can be provided through the midpoint of the first voltage stabilization bridge arm and the second voltage stabilization bridge arm, so that a stable neutral point is provided for the rear-stage alternating current power grid, and the battery energy storage circuit meets the operation requirement of the three-phase four-wire power grid.
In one embodiment, the first voltage stabilizing bridge arm comprises a plurality of first voltage stabilizing units arranged in a cascade manner, wherein a first end of a first voltage stabilizing unit of a first stage is used as a first end of the first voltage stabilizing bridge arm, and a second end of a first voltage stabilizing unit of a last stage is used as a second end of the first voltage stabilizing bridge arm;
the second voltage stabilizing bridge arm comprises a plurality of second voltage stabilizing units which are arranged in a cascade mode, wherein the first end of the first voltage stabilizing unit serves as the first end of the second voltage stabilizing bridge arm, and the second end of the second voltage stabilizing unit serves as the second end of the second voltage stabilizing bridge arm.
In one embodiment, the number of the first voltage stabilization units is equal to the number of the second voltage stabilization units.
In one embodiment, the first and second voltage stabilizing units respectively include: a first switch tube, a second switch tube, a first diode, a second diode and a voltage stabilizing capacitor, wherein,
the control end of the first switch tube is used for receiving a first control signal, the first end of the first switch tube is respectively connected with the cathode of the first diode and the first end of the voltage stabilizing capacitor, the second end of the first switch tube is connected with the anode of the first diode, and the second end of the first switch tube is used as the first end of the first voltage stabilizing unit and the first end of the second voltage stabilizing unit;
the control end of the second switching tube is used for receiving a second control signal, the first end of the second switching tube is respectively connected with the cathode of the second diode and the second end of the first switching tube, the second end of the second switching tube is respectively connected with the anode of the second diode and the second end of the voltage stabilizing capacitor, and the second end of the second switching tube is used as the second end of the first voltage stabilizing unit and the second voltage stabilizing unit; the first switch tube is conducted simultaneously or in a time-sharing manner under the action of the first control signal and the second switch tube is conducted simultaneously or in a time-sharing manner under the action of the second control signal.
In one embodiment, the first energy storage bridge arm, the second energy storage bridge arm, the third energy storage bridge arm, the fourth energy storage bridge arm, the fifth energy storage bridge arm and the sixth energy storage bridge arm respectively include a plurality of energy storage units arranged in a cascade manner.
In one embodiment, the two energy storage bridge arms in the same phase cluster respectively comprise the same number of energy storage units.
In one embodiment, the first energy storage bridge arm, the second energy storage bridge arm, the third energy storage bridge arm, the fourth energy storage bridge arm, the fifth energy storage bridge arm and the sixth energy storage bridge arm respectively include the same number of energy storage units, the same number of first voltage stabilization units and the same number of second voltage stabilization units.
In one embodiment, the energy storage unit comprises a third switching tube, a fourth switching tube, a third diode, a fourth diode and an energy storage device, wherein,
the control end of the third switching tube is used for receiving a third control signal, the first end of the third switching tube is respectively connected with the cathode of the third diode and the positive end of the energy storage device, the second end of the third switching tube is connected with the anode of the third diode, and the second end of the third switching tube is used as the first end of the voltage stabilizing unit;
the control end of the fourth switching tube is used for receiving a fourth control signal, the first end of the fourth switching tube is respectively connected with the cathode of the fourth diode and the second end of the third switching tube, the second end of the fourth switching tube is respectively connected with the anode of the fourth diode and the cathode end of the energy storage device, and the second end of the fourth switching tube is used as the second end of the voltage stabilizing unit; and the third switching tube is conducted simultaneously or in a time-sharing manner under the action of the third control signal and the fourth switching tube under the action of the fourth control signal.
In one embodiment, the energy storage unit comprises a filter capacitor, wherein a first end of the filter capacitor is connected with a positive end of the energy storage device, and a second end of the filter capacitor is connected with a negative end of the energy storage device.
In one embodiment, the battery energy storage circuit further comprises: a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, and an eighth inductor, wherein,
the first inductor is respectively connected with the second end of the first voltage stabilizing bridge arm and a first common endpoint, and the first common endpoint is an endpoint which is arranged between the second end of the first voltage stabilizing bridge arm and the first end of the second voltage stabilizing bridge arm and is connected with the neutral line;
the second inductor is respectively connected with the first end of the second voltage-stabilizing bridge arm and the first common end point;
the third inductor is respectively connected with the second end of the first energy storage bridge arm and a second common end point, and the second common end point is an end point which is arranged between the second end of the first energy storage bridge arm and the first end of the second energy storage bridge arm and is connected with the first phase line;
the fourth inductor is respectively connected with the first end of the second energy storage bridge arm and the second common endpoint;
the fifth inductor is respectively connected with the second end of the third energy storage bridge arm and a third common end point, and the third common end point is an end point which is arranged between the second end of the third energy storage bridge arm and the first end of the fourth energy storage bridge arm and is connected with the second phase line;
the sixth inductor is respectively connected with the first end of the fourth energy storage bridge arm and the third common end point;
the seventh inductor is respectively connected with the second end of the fifth energy storage bridge arm and a fourth common endpoint, and the first common endpoint is an endpoint which is arranged between the second end of the fifth energy storage bridge arm and the first end of the sixth energy storage bridge arm and is connected with the third phase line;
and the eighth inductor is respectively connected with the first end of the sixth energy storage bridge arm and the fourth common endpoint.
In one embodiment, the battery energy storage circuit further comprises: a ninth inductance, a tenth inductance, and an eleventh inductance, wherein,
the ninth inductor is respectively connected with the second common endpoint and the first phase line;
the tenth inductor is respectively connected with the third common end point and the second phase line;
and the ninth inductor is respectively connected with the fourth common endpoint and the third phase line.
The present application provides in a second aspect a battery energy storage system comprising: a three-phase ac power grid comprising a first phase line, a second phase line, a third phase line and a neutral line, and a battery tank circuit as in any preceding embodiment, wherein the battery tank circuit is connected to the first phase line, the second phase line, the third phase line and the neutral line respectively.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a battery energy storage circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a battery energy storage circuit according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a voltage regulator unit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an energy storage unit in an embodiment provided in the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In an embodiment of the present application, as shown in fig. 1, a battery energy storage circuit is provided, which includes a first voltage regulation bridge arm 10, a second voltage regulation bridge arm 20, a first phase cluster 30, a second phase cluster 40, and a third phase cluster 50, where a first end of the first voltage regulation bridge arm 10 is used for connecting to a first end of a dc power grid; a first end of the second voltage stabilization bridge arm 20 is connected with a second end of the first voltage stabilization bridge arm 10 and a neutral line of a three-phase alternating current power grid respectively, and a second end of the second voltage stabilization bridge arm 20 is used for being connected with a second end of the direct current power grid; the first phase cluster 30 comprises a first energy storage bridge arm 31 and a second energy storage bridge arm 32, wherein a first end of the first energy storage bridge arm 31 is used for being connected with a first end of a direct-current power grid, a second end of the first energy storage bridge arm 31 is respectively connected with a first end of the second energy storage bridge arm 32 and a first phase line of a three-phase alternating-current power grid, and a second end of the second energy storage bridge arm 32 is used for being connected with a second end of the direct-current power grid; the second phase cluster 40 comprises a third energy storage bridge arm 41 and a fourth energy storage bridge arm 42, wherein a first end of the third energy storage bridge arm 41 is used for being connected with a first end of a direct-current power grid, a second end of the third energy storage bridge arm 41 is respectively connected with a first end of the fourth energy storage bridge arm 42 and a second phase line of the three-phase alternating-current power grid, and a second end of the fourth energy storage bridge arm 42 is used for being connected with a second end of the direct-current power grid; the third phase cluster 50 includes a fifth energy storage bridge arm 51 and a sixth energy storage bridge arm 52, a first end of the fifth energy storage bridge arm 51 is used for connecting a first end of a direct current power grid, a second end of the fifth energy storage bridge arm 51 is respectively connected with the first end of the sixth energy storage bridge arm 52 and a third phase line of a three-phase alternating current power grid, and a second end of the sixth energy storage bridge arm 52 is used for connecting a second end of the direct current power grid.
In the battery energy storage circuit described in the above embodiment, by providing the first voltage stabilization bridge arm 10 and the second voltage stabilization bridge arm 20, on one hand, the output voltage of the direct current power grid end can be stabilized, and on the other hand, a stable reference voltage can be provided through the midpoint of the first voltage stabilization bridge arm 10 and the second voltage stabilization bridge arm 20, so that a stable neutral point is provided for the rear-stage alternating current power grid, and the battery energy storage circuit meets the operation requirement of the three-phase four-wire power grid.
As an example, referring to fig. 2, the first voltage stabilization bridge arm 10 includes a plurality of first voltage stabilization units S arranged in cascade 1 Wherein, the first stage of the first voltage stabilization unit S 11 As the first end of the first voltage-stabilizing bridge arm 10, and the last stage of the first voltage-stabilizing unit S 1N As a second end of the first voltage regulator leg 10; the second voltage-stabilizing bridge arm 20 comprises a plurality of second voltage-stabilizing units S arranged in cascade 2 Wherein the first stage second voltage stabilization unit S 21 As the first end of the second voltage-stabilizing bridge arm 20, and the last stage of the second voltage-stabilizing unit S 2N As a second end of second zener bridge arm 20. In some of these embodiments, the first voltage stabilization unit S 1 And the second voltage stabilization unit S 2 Are equal in number. In actual work, the voltage of the upper and lower voltage stabilization bridge arms are equal and are all U-shaped by controlling the number of the voltage stabilization units put into the first voltage stabilization bridge arm and the second voltage stabilization bridge arm dc /2, wherein U dc The output voltage of the direct current network is ensured, so that on one hand, the sum of the voltages of the first voltage stabilization bridge arm and the second voltage stabilization bridge arm is ensured to be the output voltage U of the direct current network dc On the other hand, the input end of the first voltage stabilizing bridge arm is controlled to be positive powerPress U dc Controlling the voltage of the output end of the second voltage-stabilizing bridge arm to be negative voltage-U dc And/2, the midpoint voltage of the first voltage-stabilizing bridge arm and the second voltage-stabilizing bridge arm is 0, and the first voltage-stabilizing bridge arm and the second voltage-stabilizing bridge arm can keep relatively stable, so that a stable neutral point is provided for a rear-stage alternating-current power grid, and a power supply is provided for a three-phase four-wire power grid.
As an example, referring to fig. 3, the first voltage stabilizing unit S 1 And a second voltage stabilization unit S 2 Respectively comprises the following steps: first switch tube T 1 A second switch tube T 2 A first diode D 1 A second diode D 2 And voltage-stabilizing capacitor C 0 Wherein, the first switch tube T 1 The control end of the first switch tube T is used for receiving a first control signal 1 Respectively with a first diode D 1 Cathode and voltage-stabilizing capacitor C 0 Is connected with a first end of a first switch tube T 1 Second terminal and first diode D 1 Is connected with the anode of the first switch tube T 1 As a first voltage stabilizing unit S 1 A second voltage stabilizing unit S 2 The first end of (a); second switch tube T 2 The control end of the first switch tube T is used for receiving a first control signal 2 Respectively with a second diode D 2 Cathode of (2), first switch tube T 1 Is connected with the second end of the second switch tube T 2 Respectively with a second diode D 2 Anode of (2), voltage-stabilizing capacitor C 0 Is connected with the second end of the second switch tube T 2 As a first voltage stabilizing unit S 1 A second voltage stabilizing unit S 2 A second end of (a); wherein, the first switch tube T 1 Under the action of the first control signal, and the second switch tube T 2 And the two-way switch is simultaneously conducted or conducted in a time-sharing way under the action of the second control signal. In some embodiments, the first switch tube T 1 And a second switching tube T 2 The drive control signal can adopt direct current as carrier phase shift of modulation wave, i.e. the switch device of every voltage-stabilizing unit uses identical modulation wave to produce PWM modulation wave, and the carrier waves of adjacent voltage-stabilizing units are different by identical phase angle, the sum of phase angles of phase difference of all voltage-stabilizing units is 2 pi, pi is circumferential ratio, first switch is connected with second switch, and the phase difference of every voltage-stabilizing unit is greater than that of adjacent voltage-stabilizing unit, and the first switch is connected with second switchPipe T 1 And a second switching tube T 2 The method can also be used for operation in a mode of cyclic alternation access, and the product of the input quantity of the voltage stabilizing units of the first voltage stabilizing bridge arm and the second voltage stabilizing bridge arm and the output voltage of the voltage stabilizing unit is kept to be U through cyclically switching the input of the voltage stabilizing units dc And/2, workers in the field can select the switch control mode at will according to requirements, and the application is not limited in particular.
As an example, with continued reference to fig. 2, the first energy storage bridge arm 31, the second energy storage bridge arm 32, the third energy storage bridge arm 41, the fourth energy storage bridge arm 42, the fifth energy storage bridge arm 51, and the sixth energy storage bridge arm 52 respectively include a plurality of energy storage units arranged in cascade, and the two energy storage bridge arms in the same phase cluster respectively include the same number of energy storage units. In some embodiments, the input quantity of the energy storage units in each energy storage bridge arm can be controlled to enable three-phase alternating-current voltages with phases different by 120 degrees to be generated at the three-phase alternating-current inlet.
In one embodiment, the number of energy storage cells, the number of first voltage stabilizing cells and the number of second voltage stabilizing cells of each of the first energy storage bridge arm 31, the second energy storage bridge arm 32, the third energy storage bridge arm 41, the fourth energy storage bridge arm 42, the fifth energy storage bridge arm 51 and the sixth energy storage bridge arm 52 are the same.
As an example, referring to fig. 4, the energy storage unit includes a third switching tube T 3 A fourth switching tube T 4 A third diode D 3 A fourth diode D 4 And an energy storage device U, wherein a third switching tube T 3 The control terminal of the first transistor is used for receiving a third control signal, and a third switching tube T 3 Respectively with a third diode D 3 The cathode of the energy storage device U is connected with the positive end of the energy storage device U, and the third switching tube T 3 Second terminal and third diode D 3 Is connected with the anode of the third switching tube T 3 The second end of the voltage stabilizing unit is used as the first end of the voltage stabilizing unit; fourth switch tube T 4 The control end of the first switch tube T is used for receiving a first control signal and the second switch tube T is used for receiving a second control signal 4 Respectively with a fourth diode D 4 Cathode of (2), third switch tube T 3 Is connected with the second end of the fourth switch tube T 4 Second ends of (a) are respectively connected withFourth diode D 4 The anode of the first switching tube T is connected with the negative end of the energy storage device U, and the fourth switching tube T 4 The second end of the voltage stabilizing unit is used as the second end of the voltage stabilizing unit; wherein, the third switch tube T 3 Under the action of the third control signal, and a fourth switch tube T 4 And the first control signal and the second control signal are simultaneously conducted or conducted in a time-sharing mode under the action of the fourth control signal. In some embodiments, the voltage is controlled by a third switch tube T 3 And a fourth switching tube T 4 The modulation mode of the driving signal adopts three-phase alternating current with a phase difference of 120 degrees as carrier phase shift of the modulation wave, namely, the carriers of bridge arms with different phases are completely the same, but the phase difference of the modulation wave is 120 degrees, the carrier phases of adjacent energy storage units have the same phase angle in the same bridge arm, and the sum of the phase angles of the phase differences of all the energy storage units is 2 pi.
In particular, the particular type of energy storage device U is not exclusive and in some embodiments, the energy storage device U may be a battery. Further, a lithium titanate battery can be used as the energy storage device U, for example, the rated voltage of the lithium titanate battery used is 48V, and the nominal capacity is 55Ah. In a similar way, the first switch tube T 1 A second switch tube T 2 A third switch tube T 3 And a fourth switching tube T 4 Is not exclusive, e.g. the first switching tube T 1 A second switch tube T 2 A third switch tube T 3 And a fourth switching tube T 4 May be all metal oxide semiconductor field effect transistors. In some embodiments, in order to ensure that the battery energy storage system can be used in a higher voltage environment, the withstand voltage of the selected MOSFET should be 100V-150V. Further, in a more detailed embodiment, a power MOSFET of type SFG180N10PF is selected as the switching device of the energy storage unit, which allows a continuous drain current of 180A to pass and a pulsed drain current of 540A to be sustained. In the same voltage stabilizing unit, two MOSFETs are connected in half-bridge structure and connected with a voltage stabilizing capacitor C 0 Parallel voltage-stabilizing capacitor C 0 May be 6800uF. In the same energy storage unit, two MOSFETs are connected in a half-bridge structure and connected with a filter capacitor C 1 A filter capacitor C connected in parallel with the energy storage device U 1 May be 6800uF。
By way of example, continuing to refer to fig. 4, the energy storage unit further comprises a filter capacitor C 1 Wherein the filter capacitor C 1 The first end of the filter capacitor is connected with the positive end of the energy storage device U, and the filter capacitor C 1 And the second end of the second diode is connected with the negative end of the energy storage device U.
By way of example, continuing to refer to fig. 2, the battery tank circuit further includes a first inductor L 1 A second inductor L 2 A third inductor L 3 A fourth inductor L 4 A fifth inductor L 5 A sixth inductor L 6 A seventh inductor L 7 And an eighth inductance L 8 Wherein the first inductor L 1 The second end of the first voltage-stabilizing bridge arm 10 and a first common end point are respectively connected, and the first common end point is an end point which is arranged between the second end of the first voltage-stabilizing bridge arm 10 and the first end of the second voltage-stabilizing bridge arm 20 and is connected with a neutral line; second inductance L 2 The first end of the second voltage-stabilizing bridge arm 20 and the first common end point are respectively connected; third inductance L 3 The second end of the first energy storage bridge arm 31 and a second common end point are respectively connected, and the second common end point is an end point which is arranged between the second end of the first energy storage bridge arm 31 and the first end of the second energy storage bridge arm 32 and is connected with the first phase line; fourth inductance L 4 The first end of the second energy storage bridge arm 32 and the second common end point are respectively connected; fifth inductance L 5 The second end of the third energy storage bridge arm 41 and a third common end point are respectively connected, and the third common end point is an end point which is arranged between the second end of the third energy storage bridge arm 41 and the first end of the fourth energy storage bridge arm 42 and is connected with a second phase line; sixth inductance L 6 The first end of the fourth energy storage bridge arm 42 and the third common end point are respectively connected; seventh inductor L 7 The second end of the fifth energy storage bridge arm 51 and a fourth common end point are respectively connected, and the first common end point is an end point which is arranged between the second end of the fifth energy storage bridge arm 51 and the first end of the sixth energy storage bridge arm 52 and is connected with the third phase line; eighth inductance L 8 Respectively connecting a first end of sixth tank leg 52 to a fourth common terminal.
As an example, continuing to refer to fig. 2, the battery energy storage circuit further comprises: ninth inductance L 9 The tenth inductor L 10 And eleventh electricityFeeling L 11 Wherein, the ninth inductance L 9 Respectively connecting the second common endpoint with the first phase line; tenth inductor L 10 The third common endpoint and the second phase line are respectively connected; ninth inductance L 11 And the fourth common endpoint and the third phase line are respectively connected.
A second aspect of the present application provides a battery energy storage system, comprising: a three-phase ac power grid comprising a first phase line, a second phase line, a third phase line and a neutral line, and a battery tank circuit as in any preceding embodiment, wherein the battery tank circuit is connected to the first phase line, the second phase line, the third phase line and the neutral line respectively.
The application is explained by combining with the specific embodiment, the battery energy storage system of the embodiment is applied to a 60kW/380V battery energy storage system, and the rated voltage of the direct current side is 750V. And the rated capacity of a transformer in a power distribution network connected with the battery energy storage system is 250kVA. The voltage stabilizing unit of the embodiment comprises 2 switching devices, a freewheeling diode and 1 stabilizing capacitor C 0 The voltage stabilizing unit is formed in parallel, and the energy storage unit comprises 2 switching devices, a freewheeling diode and 1 filter capacitor C 1 And 1 energy storage battery U which forms an energy storage unit in a parallel connection mode. And 20 energy storage units of each bridge arm are connected according to the mode of figure 1 to form the whole battery energy storage system. The energy storage battery U of the energy storage unit is a lithium titanate battery with a rated voltage of 48V and a nominal capacity of 55Ah, and the bridge arms connected among the bridge arms are connected with an inductor (namely a first inductor L) 1 To the eighth inductance L 8 ) All inductance values of (1 mH), and the AC side is connected with an inductor (i.e. a ninth inductor L) 1 To the eleventh inductance L 11 ) The inductance value was chosen to be 1mH after taking the filtering effect into account. First switch tube T 1 A second switch tube T 2 A third switch tube T 3 And a fourth switching tube T 4 The voltage resistance of the MOSFET is 100V-150V, the MOSFET with the model number of SFG180N10PF is selected as a switching device, the allowable continuous drain current is 180A, and the sustainable pulse drain current is 540A. In the same voltage stabilizing unit, two MOSFETs are connected in half-bridge structure and connected with voltage stabilizing capacitor C 0 Parallel voltage-stabilizing capacitor C 0 May have a capacity of6800uF. In the same energy storage unit, two MOSFETs are connected in a half-bridge structure and connected with a filter capacitor C 1 A filter capacitor C connected in parallel with the energy storage device U 1 May be 6800uF. Suppose the positive terminal voltage of the direct current power grid is + U dc /2, negative terminal voltage is-U dc /2. The voltage stabilizing unit adopts direct current as carrier phase shift of the modulation wave, or each voltage stabilizing unit is connected in a cyclic and alternate mode, so that the neutral line voltage of a three-phase alternating current power grid is maintained at 0, the modulation mode of the driving signal of the switching device in the energy storage unit adopts three-phase alternating current with phase difference of 120 degrees as carrier phase shift of the modulation wave, and the voltage of a three-phase alternating current outlet is kept as three-phase alternating current with phase difference of 120 degrees.
It should be noted that, in the embodiments provided in the present application, it should be understood that the disclosed technical contents may be implemented in other manners. The above-described system embodiments are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in a hardware manner.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (12)

1. A battery tank circuit, comprising:
the first end of the first voltage stabilization bridge arm is used for being connected with the first end of a direct current power grid;
a first end of the second voltage-stabilizing bridge arm is respectively connected with a second end of the first voltage-stabilizing bridge arm and a neutral line of the three-phase alternating current network, and the second end of the second voltage-stabilizing bridge arm is used for being connected with a second end of the direct current network;
the first phase cluster comprises a first energy storage bridge arm and a second energy storage bridge arm, the first end of the first energy storage bridge arm is used for being connected with the first end of the direct-current power grid, the second end of the first energy storage bridge arm is respectively connected with the first end of the second energy storage bridge arm and a first phase line of the three-phase alternating-current power grid, and the second end of the second energy storage bridge arm is used for being connected with the second end of the direct-current power grid;
the second phase cluster comprises a third energy storage bridge arm and a fourth energy storage bridge arm, wherein the first end of the third energy storage bridge arm is used for being connected with the first end of the direct-current power grid, the second end of the third energy storage bridge arm is respectively connected with the first end of the fourth energy storage bridge arm and a second phase line of the three-phase alternating-current power grid, and the second end of the fourth energy storage bridge arm is used for being connected with the second end of the direct-current power grid;
and the third phase cluster comprises a fifth energy storage bridge arm and a sixth energy storage bridge arm, the first end of the fifth energy storage bridge arm is used for being connected with the first end of the direct-current power grid, the second end of the fifth energy storage bridge arm is respectively connected with the first end of the sixth energy storage bridge arm and the third phase line of the three-phase alternating-current power grid, and the second end of the sixth energy storage bridge arm is used for being connected with the second end of the direct-current power grid.
2. The battery energy storage circuit according to claim 1, wherein the first voltage stabilization bridge arm comprises a plurality of first voltage stabilization units arranged in cascade, wherein a first end of the first voltage stabilization unit of a first stage serves as a first end of the first voltage stabilization bridge arm, and a second end of the first voltage stabilization unit of a last stage serves as a second end of the first voltage stabilization bridge arm;
the second voltage stabilizing bridge arm comprises a plurality of second voltage stabilizing units which are arranged in a cascade mode, wherein the first end of the first voltage stabilizing unit serves as the first end of the second voltage stabilizing bridge arm, and the second end of the second voltage stabilizing unit serves as the second end of the second voltage stabilizing bridge arm.
3. The battery energy storage circuit of claim 2, wherein the number of the first voltage regulation units is equal to the number of the second voltage regulation units.
4. The battery energy storage circuit of claim 2, wherein the first and second voltage stabilization units each comprise: a first switch tube, a second switch tube, a first diode, a second diode and a voltage stabilizing capacitor, wherein,
the control end of the first switch tube is used for receiving a first control signal, the first end of the first switch tube is respectively connected with the cathode of the first diode and the first end of the voltage-stabilizing capacitor, the second end of the first switch tube is connected with the anode of the first diode, and the second end of the first switch tube is used as the first end of the first voltage-stabilizing unit and the first end of the second voltage-stabilizing unit;
a control end of the second switching tube is configured to receive a second control signal, a first end of the second switching tube is connected to a cathode of the second diode and a second end of the first switching tube, a second end of the second switching tube is connected to an anode of the second diode and a second end of the voltage stabilizing capacitor, and the second end of the second switching tube is used as a second end of the first voltage stabilizing unit and a second end of the second voltage stabilizing unit; the first switch tube is conducted simultaneously or in a time-sharing mode under the action of the first control signal and the second switch tube is conducted under the action of the second control signal.
5. The battery energy storage circuit of claim 2, wherein the first energy storage bridge arm, the second energy storage bridge arm, the third energy storage bridge arm, the fourth energy storage bridge arm, the fifth energy storage bridge arm and the sixth energy storage bridge arm respectively comprise a plurality of energy storage units which are arranged in a cascade manner.
6. The battery energy storage circuit of claim 5, wherein the two energy storage bridge arms in the same phase cluster respectively comprise the same number of energy storage units.
7. The battery energy storage circuit according to claim 6, wherein the first energy storage bridge arm, the second energy storage bridge arm, the third energy storage bridge arm, the fourth energy storage bridge arm, the fifth energy storage bridge arm and the sixth energy storage bridge arm respectively comprise the same number of energy storage units, the same number of first voltage stabilization units and the same number of second voltage stabilization units.
8. The battery energy storage circuit of claim 7, wherein the energy storage unit comprises a third switching tube, a fourth switching tube, a third diode, a fourth diode and an energy storage device, wherein,
the control end of the third switching tube is used for receiving a third control signal, the first end of the third switching tube is respectively connected with the cathode of the third diode and the positive end of the energy storage device, the second end of the third switching tube is connected with the anode of the third diode, and the second end of the third switching tube is used as the first end of the voltage stabilizing unit;
the control end of the fourth switching tube is used for receiving a fourth control signal, the first end of the fourth switching tube is respectively connected with the cathode of the fourth diode and the second end of the third switching tube, the second end of the fourth switching tube is respectively connected with the anode of the fourth diode and the cathode end of the energy storage device, and the second end of the fourth switching tube is used as the second end of the voltage stabilizing unit; the third switching tube is conducted simultaneously or in a time-sharing mode under the action of the third control signal and the fourth switching tube is conducted under the action of the fourth control signal.
9. The battery energy storage circuit of claim 8, wherein the energy storage unit comprises a filter capacitor, wherein a first terminal of the filter capacitor is connected to a positive terminal of the energy storage device, and a second terminal of the filter capacitor is connected to a negative terminal of the energy storage device.
10. The battery tank circuit of any of claims 1-9, further comprising: a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, and an eighth inductor, wherein,
the first inductor is respectively connected with the second end of the first voltage stabilizing bridge arm and a first common endpoint, and the first common endpoint is an endpoint which is arranged between the second end of the first voltage stabilizing bridge arm and the first end of the second voltage stabilizing bridge arm and is connected with the neutral line;
the second inductor is respectively connected with the first end of the second voltage-stabilizing bridge arm and the first common end point;
the third inductor is respectively connected with the second end of the first energy storage bridge arm and a second common end point, and the second common end point is an end point which is arranged between the second end of the first energy storage bridge arm and the first end of the second energy storage bridge arm and is connected with the first phase line;
the fourth inductor is respectively connected with the first end of the second energy storage bridge arm and the second common endpoint;
the fifth inductor is respectively connected with the second end of the third energy storage bridge arm and a third common end point, and the third common end point is an end point which is arranged between the second end of the third energy storage bridge arm and the first end of the fourth energy storage bridge arm and is connected with the second phase line;
the sixth inductor is respectively connected with the first end of the fourth energy storage bridge arm and the third common end point;
the seventh inductor is respectively connected with the second end of the fifth energy storage bridge arm and a fourth common endpoint, and the first common endpoint is an endpoint which is arranged between the second end of the fifth energy storage bridge arm and the first end of the sixth energy storage bridge arm and is connected with the third phase line;
and the eighth inductor is respectively connected with the first end of the sixth energy storage bridge arm and the fourth common endpoint.
11. The battery tank circuit of claim 10, further comprising: a ninth inductance, a tenth inductance, and an eleventh inductance, wherein,
the ninth inductor is respectively connected with the second common endpoint and the first phase line;
the tenth inductor is respectively connected with the third common endpoint and the second phase line;
and the ninth inductor is respectively connected with the fourth common endpoint and the third phase line.
12. A battery energy storage system, comprising: a three-phase ac power grid comprising a first phase line, a second phase line, a third phase line and a neutral line, and a battery tank circuit according to any of claims 1-11, wherein the battery tank circuit is connected to the first phase line, the second phase line, the third phase line and the neutral line, respectively.
CN202211084100.8A 2022-09-06 2022-09-06 Battery energy storage circuit and system Pending CN115473265A (en)

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LU505599A LU505599B1 (en) 2022-09-06 2023-05-30 Battery energy storage circuit and system
PCT/CN2023/097005 WO2024051217A1 (en) 2022-09-06 2023-05-30 Battery energy storage circuit and system

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WO2024051217A1 (en) * 2022-09-06 2024-03-14 南方电网调峰调频发电有限公司储能科研院 Battery energy storage circuit and system

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CN203722509U (en) * 2014-02-28 2014-07-16 华南理工大学 Sic high-voltage switch and silicon IGBT hybrid type three-phase four-wire high-voltage converter
CN103825482B (en) * 2014-02-28 2016-08-17 华南理工大学 Three-phase and four-line bridge-type modular unit tandem compound high tension transformer
CN107017798B (en) * 2017-03-30 2019-06-07 上海交通大学 A kind of modular multi-level converter topology with energy-storage function
CN214959327U (en) * 2021-05-08 2021-11-30 南方电网调峰调频发电有限公司 Energy storage circuit and modular multilevel converter
CN113489032B (en) * 2021-05-31 2023-05-30 南方电网调峰调频发电有限公司 Battery energy storage circuit and battery energy storage system
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