CN116566010B - Multi-battery cluster voltage distribution method and device - Google Patents

Multi-battery cluster voltage distribution method and device Download PDF

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Publication number
CN116566010B
CN116566010B CN202310564871.5A CN202310564871A CN116566010B CN 116566010 B CN116566010 B CN 116566010B CN 202310564871 A CN202310564871 A CN 202310564871A CN 116566010 B CN116566010 B CN 116566010B
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power
power unit
bridge arm
output voltage
power units
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CN116566010A (en
Inventor
成前
刘明义
曹曦
曹传钊
雷浩东
平小凡
杨超然
荆鑫
许国泽
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Huaneng Jinchang Photovoltaic Power Generation Co ltd
Huaneng Clean Energy Research Institute
Huaneng Jinan Huangtai Power Generation Co Ltd
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Huaneng Jinchang Photovoltaic Power Generation Co ltd
Huaneng Clean Energy Research Institute
Huaneng Jinan Huangtai Power Generation Co Ltd
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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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • 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
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The disclosure provides a voltage distribution method and device for a multi-battery cluster, which relate to the technical field of energy storage and comprise the following steps: acquiring reference voltage, bridge arm current and first output voltage of a bridge arm, and charge states of battery clusters corresponding to power units in the bridge arm; calculating a first number of first power cells based on the reference voltage and the first output voltage; selecting a first number of first power units from the power units according to the magnitude of bridge arm current; calculating a second number of remaining second power cells in the respective power cells based on the first number; and distributing the output voltage corresponding to each power unit based on the second quantity, the magnitude of the bridge arm current and the charge state of each battery cluster. Therefore, the output voltage of each power unit can be flexibly selected according to the current direction and the charge state of the sub-module battery cluster, and the problem of uneven SOC of the battery cluster can be further solved.

Description

Multi-battery cluster voltage distribution method and device
Technical Field
The disclosure relates to the technical field of energy storage, in particular to a voltage distribution method and device for multiple battery clusters.
Background
The energy storage is an important technology and basic equipment for supporting a novel power system, and has important significance for promoting energy green transformation, coping with extreme events, guaranteeing energy safety, promoting high-quality development of energy, and realizing carbon peak and carbon neutralization. With the continuous increase of the installed capacity of new energy, newly-built energy storage projects often require energy storage power stations to simultaneously meet the peak shaving and frequency modulation requirements of the power grid and the safe and stable operation requirements of the power grid.
In some cases, a modularized multi-level converter with sub-modules being single-phase three-level neutral point clamped converters is used in the energy storage system, and each single-phase three-level neutral point clamped converter is provided with a series-connected battery cluster, if the voltage of the battery clusters is unevenly distributed, the SOC difference of the battery clusters may be too large, and part of the battery clusters end the charging or discharging process in advance, so that the energy storage system cannot meet the output required power.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
An embodiment of a first aspect of the present disclosure provides a voltage distribution method for a multi-battery cluster, including:
acquiring reference voltage, bridge arm current and first output voltage of a bridge arm and charge states of battery clusters corresponding to power units in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters;
Calculating a first number of first power cells based on the reference voltage and the first output voltage;
selecting the first number of the first power units from the power units according to the magnitude of the bridge arm current;
calculating a second number of remaining second power cells in the respective power cells based on the first number;
and distributing the output voltage corresponding to each power unit based on the second quantity, the magnitude of the bridge arm current and the charge state of each battery cluster.
Embodiments of a second aspect of the present disclosure provide a voltage distribution device for a multi-cell cluster, including:
the power supply device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring reference voltage, bridge arm current and first output voltage of a bridge arm and charge states of battery clusters corresponding to power units in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters;
a first calculation module for calculating a first number of first power cells based on the reference voltage and the first output voltage;
a selection module, configured to select the first number of the first power units from the power units according to the magnitude of the bridge arm current;
A second calculating module, configured to calculate, based on the first number, a second number of second power units remaining in the respective power units currently;
and the distribution module is used for distributing the output voltage corresponding to each power unit based on the second quantity, the magnitude of the bridge arm current and the charge state of each battery cluster.
An embodiment of a third aspect of the present disclosure provides an electronic device, including: the system comprises a memory, a processor and an energy storage system control program stored on the memory and capable of running on the processor, wherein the processor realizes the voltage distribution method of the multi-battery cluster according to the embodiment of the first aspect of the present disclosure when executing the program.
An embodiment of a fourth aspect of the present disclosure proposes a non-transitory computer readable storage medium storing an energy storage system control program, which when executed by a processor, implements a voltage distribution method of a multi-battery cluster as proposed in an embodiment of the first aspect of the present disclosure.
The voltage distribution method and device for the multi-battery cluster have the following beneficial effects:
in the embodiment of the disclosure, the device firstly obtains a reference voltage, a bridge arm current and a first output voltage of a bridge arm, and a state of charge of each battery cluster corresponding to each power unit in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters, then calculates a first number of first power units based on the reference voltage and the first output voltage, then selects the first number of first power units from the power units according to the magnitude of bridge arm current, then calculates a second number of remaining second power units in the power units based on the first number, and finally distributes the output voltage corresponding to each power unit based on the second number, the magnitude of bridge arm current and the state of charge of each battery cluster. Therefore, the output voltage of each power unit can be flexibly selected through the current direction and the charge state of the battery cluster of the submodule, the problem of non-uniform SOC of the battery cluster can be further solved, the energy of the battery energy storage system is finely managed on the control level, the possibility of occurrence of faults of the battery cluster is reduced, the normal operation of an independent energy storage power station is further ensured, and the flexibility and the economic benefit of a traditional thermal power plant are improved.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flow chart of a voltage distribution method of a multi-battery cluster according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of a power unit of a voltage distribution method of a multi-battery cluster according to an embodiment of the disclosure;
fig. 3 is a flowchart illustrating a voltage distribution method of a multi-battery cluster according to an embodiment of the disclosure;
fig. 4 is a block diagram of a voltage distribution device of a multi-battery cluster according to an embodiment of the present disclosure;
fig. 5 illustrates a block diagram of an exemplary computer device suitable for use in implementing embodiments of the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.
Voltage distribution methods, apparatuses, energy storage system control devices, and storage media of a multi-battery cluster according to embodiments of the present disclosure are described below with reference to the accompanying drawings.
It should be noted that, the implementation body of the voltage distribution method of the multi-battery cluster in the embodiment of the disclosure is a voltage distribution device of the multi-battery cluster, and the device may be implemented by software and/or hardware, and the device may be configured in any electronic device. In the context of the present disclosure, the method for voltage distribution of a multi-battery cluster set forth in the embodiments of the present disclosure will be described below with "a voltage distribution device of a multi-battery cluster" as an execution subject, and is not limited thereto.
Fig. 1 is a flowchart illustrating a voltage distribution method of a multi-battery cluster according to an embodiment of the disclosure.
As shown in fig. 1, the voltage distribution method of the multi-cell cluster may include the steps of:
step 101, obtaining a reference voltage, a bridge arm current and a first output voltage of a bridge arm and a charge state of each battery cluster corresponding to each power unit in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters.
It should be noted that, the bridge arm reference voltage of the energy storage system refers to a voltage reference value used for the control circuit in the energy storage system, and in the embodiment of the disclosure, the voltage reference value may be a fixed value. In the energy storage system, the bridge arm reference voltage is used for controlling the switching state of the electronic element, so that the storage and the release of electric energy are realized. The bridge arm reference voltage can be adjusted through an external controller or an internal controller so as to meet different energy storage requirements. Meanwhile, stability and accuracy of bridge arm reference voltage are critical to performance and efficiency of the energy storage system.
In the disclosed embodiments, the bridge arm current refers to the current through the bridge arm in the tank system circuit. Energy storage systems typically employ ac-dc converters or dc-dc converters for storing and discharging electrical energy, each of which includes a bridge arm circuit. Bridge arm circuits are typically composed of a plurality of electronic components (e.g., IGBTs, MOSFETs, etc.) that control the flow and magnitude of current in the circuit. The magnitude and direction of the bridge arm current determine the energy storage and discharge efficiency of the energy storage system, so that accurate control and monitoring are required. Meanwhile, stability and accuracy of bridge arm current are critical to performance and safety of an energy storage system. In order to achieve accurate bridge arm current control and monitoring, energy storage systems typically need to be equipped with high precision current sensors and controllers.
Wherein the first output voltage may be a positive voltage.
Among them, state of charge (SOC) describes the remaining capacity of the battery cluster.
It should be noted that each Bridge arm circuit may include a plurality of power units, and each power unit may be a single-phase three-level neutral point clamped converter, which may include three Half-Bridge modules (HBMs), a dc-side capacitor, and an ac-side contactor switch. Wherein each power cell is connected with a battery cluster. It should be noted that each power unit may be connected to 2 battery clusters, which are a first battery cluster and a second battery cluster. As shown in fig. 2, fig. 2 shows a schematic diagram of a power cell.
The power unit comprises 3 Half-Bridge modules (HBM), namely HBM1, HBM2 and HBM3, direct-current capacitors C1 and C2 of a direct-current port, a first battery cluster R1 and a second battery cluster R2 which are connected with the power unit, and an alternating-current side contactor switch X.
The first output voltage can be a preset output voltage, that is, can be flexibly adjusted and is set according to experience. The first battery cluster may be an upper bus battery cluster, and the second battery cluster may be a lower bus battery cluster. It should be noted that, if the current flows through the upper bus battery cluster, the output voltage corresponding to the power unit may be the first output voltage, if the current does not flow through the battery cluster, the output voltage corresponding to the power unit may be 0 level, and if the current flows through the lower bus battery cluster, the output voltage corresponding to the power unit may be the second output voltage. Wherein the polarities of the second output voltage and the first output voltage are opposite.
It should be noted that, since each power unit includes the first battery cluster and the second battery cluster, the number of the first battery cluster and the second battery cluster may be the same.
Step 102, calculating a first number of first power cells based on the reference voltage and the first output voltage.
Alternatively, the ratio of the reference voltage and the first output voltage may be calculated first, after which the first number of first power cells is calculated based on the ratio.
Specifically, the first number Y may be calculated by the following formula:
where U is the first output voltage, uref is the reference voltage, and round () is the rounding function.
Step 103, selecting the first power units of the first number from the power units according to the magnitude of the bridge arm current.
The first power units may be a first number of power units selected from the power units according to the current of the bridge arm.
Optionally, the plurality of power units corresponding to the plurality of first battery clusters may be ordered according to the states of charge corresponding to the plurality of first battery clusters in order from small to large, and then the first number of first power units is obtained from small to large based on the ordering of the plurality of power units when the bridge arm current is greater than zero, or the first number of first power units is obtained from large to small based on the ordering of the plurality of power units when the bridge arm current is less than or equal to zero.
For example, if the first number is 5, the current power units are 8, and A1, A2, A3, A4, A5, A6, A7, and A8 are respectively included, where the states of charge corresponding to A1, A2, A3, A4, A5, A6, A7, and A8 are 0.51,0.52,0.53,0.54,0.55,0.56,0.57,0.58, so that A1, A2, A3, A4, A5, A6, A7, and A8 may be ranked as A1, A2, A3, A4, A5, A6, A7, and A8 from the small to the large.
If the bridge arm current is greater than 0, A1, A2, A3, A4, A5 may be taken as the first power unit, and if the bridge arm current is less than 0, A8, A7, A6, A5, A4 may be taken as the first power unit.
Step 104, calculating a second number of second power units remaining in the respective power units based on the first number.
The second power unit may be a power unit other than the first power unit in the current respective power units.
Wherein the second number may be the number of power cells other than the first power cell in the current respective power cells.
For example, if there are 19 power units in total, the first number is 4, then the second number of the remaining power units is 15, that is, the second power unit is 15.
And step 105, distributing the output voltage corresponding to each power unit based on the second quantity, the magnitude of the bridge arm current and the charge state of each battery cluster.
Specifically, when the second number is smaller than the preset threshold, the output voltage of the second power unit is controlled to be zero level, and the output voltage of the first power unit is controlled to be the first output voltage.
In the embodiment of the present disclosure, the preset threshold may be 2. It will be appreciated that if the second number is less than 2, the output voltage of each remaining second power cell may be set to 0 level, and the output voltage of the first power cell may be set to the first output voltage.
If the bridge arm current flowing into the power unit is positive, the bridge arm current flowing through the first battery cluster charges the corresponding first battery cluster, and the bridge arm current flowing through the second battery cluster discharges the corresponding second battery cluster.
It should be noted that, if the bridge arm current flowing into the power unit is negative, the bridge arm current flowing through the first battery cluster will discharge the corresponding first battery cluster, and the bridge arm current flowing through the second battery cluster will charge the corresponding second battery cluster.
As a possible implementation manner, after the first number of first power units is selected from the power units, the number of remaining power units may be determined, that is, the second number, if the second number is smaller than the preset threshold 2, may be performed according to the above steps, and if the second number is greater than or equal to 2, the next step may be performed according to the magnitude of the bridge arm current.
Further, if the bridge arm current is smaller than 0, the output of the first power unit may be set to the first output voltage U first, then the state of charge of the first battery cluster and the state of charge of the second battery cluster of each remaining second power unit may be determined, if the states of charge of the first battery cluster of each remaining second power unit are smaller than the average value of the states of charge of the first battery cluster of each corresponding power unit of the bridge arm, or the states of charge of the second battery cluster are larger than the average value of the states of charge of the second battery cluster of each corresponding power unit of the bridge arm, then the output voltage of each remaining second power unit may be set to 0, otherwise, a power unit (selected from large to small according to the states of charge of the first battery cluster of each remaining second power unit) which outputs the first output voltage, and a power unit (selected from small to large according to the states of charge of the second battery cluster of each remaining second power unit) which outputs the second output voltage is the negative value of the first output voltage may be selected. Further, whether the number of the remaining power units is smaller than a preset threshold value can be judged, if not, the steps are repeated until the states of charge of the first battery clusters of the remaining second power units are smaller than the average value of the states of charge of the first battery clusters of the power units corresponding to the bridge arms, or the states of charge of the second battery clusters are larger than the average value of the states of charge of the second battery clusters of the power units corresponding to the bridge arms, or the number of the remaining power units is smaller than the preset threshold value.
Or if the bridge arm current is greater than 0, the output of the first power unit may be set to a first output voltage U first, then the state of charge of the first battery cluster and the state of charge of the second battery cluster of each remaining second power unit may be determined, if the states of charge of the first battery cluster of each remaining second power unit are both greater than the average value of the states of charge of the first battery cluster of each corresponding bridge arm, or the states of charge of the second battery cluster are both less than the average value of the states of charge of the second battery cluster of each corresponding bridge arm, then the output voltage of each remaining second power unit may be set to 0, otherwise, a power unit (selected from small to large according to the states of charge of the first battery cluster of each remaining second power unit) that outputs the first output voltage, and a power unit (selected from large to small according to the states of charge of the second battery cluster of each remaining second power unit) that outputs the second output voltage may be selected, where the second output voltage is the negative of the first output voltage. Further, whether the number of the remaining power units is smaller than a preset threshold value can be judged, if not, the steps are repeated until the charge states of the first battery clusters of the remaining second power units are larger than the average value of the charge states of the first battery clusters of the power units corresponding to the bridge arms, or the charge states of the second battery clusters are smaller than the average value of the charge states of the second battery clusters of the power units corresponding to the bridge arms, or the number of the remaining power units is smaller than the preset threshold value.
In the embodiment of the disclosure, the device firstly obtains a reference voltage, a bridge arm current and a first output voltage of a bridge arm, and a state of charge of each battery cluster corresponding to each power unit in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters, then calculates a first number of first power units based on the reference voltage and the first output voltage, then selects the first number of first power units from the power units according to the magnitude of bridge arm current, then calculates a second number of remaining second power units in the power units based on the first number, and finally distributes the output voltage corresponding to each power unit based on the second number, the magnitude of bridge arm current and the state of charge of each battery cluster. Therefore, the output voltage of each power unit can be flexibly selected through the current direction and the charge state of the battery cluster of the submodule, the problem of non-uniform SOC of the battery cluster can be further solved, the energy of the battery energy storage system is finely managed on the control level, the possibility of occurrence of faults of the battery cluster is reduced, the normal operation of an independent energy storage power station is further ensured, and the flexibility and the economic benefit of a traditional thermal power plant are improved.
Fig. 3 is a flowchart illustrating a voltage distribution method of a multi-battery cluster according to an embodiment of the disclosure.
As shown in fig. 3, the voltage distribution method of the multi-cell cluster may include the steps of:
step 201, obtaining a reference voltage, a bridge arm current and a first output voltage of a bridge arm, and a state of charge of each battery cluster corresponding to each power unit in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters.
Step 202, calculating a first number of first power cells based on the reference voltage and the first output voltage.
Step 203, selecting the first number of the first power units from the power units according to the magnitude of the bridge arm current.
Step 204, calculating a second number of remaining second power units in the respective power units based on the first number.
It should be noted that, the specific implementation manner of the steps 201 to 204 may refer to the above embodiment, and will not be described herein.
Step 205, when the second number is greater than the preset threshold, calculating a first average value of a plurality of first battery clusters corresponding to the bridge arm and a second average value corresponding to the plurality of second battery clusters according to the charge states of the battery clusters in the bridge arm.
The first average value may be an average value of charge states of each first battery cluster in the current bridge arm, and the second average value may be an average value of charge states of each second battery cluster in the current bridge arm.
For example, if the current battery clusters have 10 battery clusters, 5 first battery clusters and 5 second battery clusters are respectively included. The states of charge of the 5 first battery clusters are 0.2, 0.8, 0.6, 0.4, and 0.5, respectively, the first average value can be calculated to be 0.5, and if the states of charge of the 5 second battery clusters are 0.3, 0.5, 0.2, 0.4, and 0.6, respectively, the first average value can be calculated to be 0.4.
It should be noted that the above examples are only illustrative, and are not limited thereto.
Step 206, judging whether a third power unit meeting a first preset condition and a fourth power unit meeting a second preset condition exist or not based on preset conditions related to the magnitude of the bridge arm current and the charge state of the battery cluster corresponding to the second power unit, the first average value and the second average value, wherein the preset conditions comprise the first preset condition and the second preset condition.
Optionally, under the condition that the bridge arm current is greater than zero, judging whether the charge state of the first battery cluster corresponding to each second power unit is smaller than the first average value, determining the second power unit with the charge state smaller than the first average value of the corresponding first battery cluster as a third power unit, then judging whether the charge state of the second battery cluster corresponding to each second power unit is greater than the second average value, and determining the second power unit with the charge state greater than the second average value of the corresponding second battery cluster as a fourth power unit.
For example, if the bridge arm current is greater than zero, the second power units are R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10, the charge states of the corresponding second battery clusters are 0.2, 0.5, 0.3, 0.4, 0.85, 0.62, 0.78, 0.35, 0.5, and 0.4, respectively, and the second average value is 0.5, then R5, R6, and R7 may be used as the fourth power units.
If the states of charge of the corresponding first battery clusters are 0.2, 0.5, 0.3, 0.4, 0.85, 0.62, 0.78, 0.35, 0.5, 0.4, and the first average value is 0.5, then R1, R3, R4, R8, and R10 can be used as the third power unit.
Optionally, if the bridge arm current is less than or equal to zero, determining whether the state of charge of the first battery cluster corresponding to each second power unit is less than a first average value, determining a second power unit with the state of charge of the corresponding first battery cluster less than the first average value as a third power unit, then determining whether the state of charge of the second battery cluster corresponding to each second power unit is greater than the second average value, and determining a second power unit with the state of charge of the corresponding second battery cluster greater than the second average value as a fourth power unit.
For example, if the bridge arm current is less than or equal to zero, the second power units are R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10, the charge states of the corresponding first battery clusters are 0.2, 0.5, 0.3, 0.4, 0.85, 0.62, 0.78, 0.35, 0.5, and 0.4, respectively, and the first average value is 0.5, then R5, R6, and R7 may be used as the third power units.
If the states of charge of the corresponding second battery clusters are 0.2, 0.5, 0.3, 0.4, 0.85, 0.62, 0.78, 0.35, 0.5, 0.4, and the second average value is 0.5, then R1, R3, R4, R8, and R10 can be used as the fourth power unit.
Step 207, controlling the output voltages of the third power unit and the first power unit to be the first output voltage when the number of the third power unit is less than or equal to the fourth power unit.
For example, if there are 4 third power units and 5 fourth power units, the output voltages of the 4 third power units may be set to the first output voltage, and the output voltage of the first power unit may also be set to the first output voltage.
For example, if the bridge arm includes 12 power units, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, and Q12, respectively, where Q1, Q2, and Q3 are known as a first power unit, Q4, Q5, Q6, and Q7 are known as a third power unit, and Q8, Q9, Q10, and Q11, and Q12 are known as a fourth power unit, since there are 4 third power units and 5 fourth power units, the output voltages of Q4, Q5, Q6, Q7, and Q1, Q2, and Q3 may be set to be the first output voltages in order to pair the third power units and the fourth power units.
And step 208, obtaining fifth power units with the same number as the third power units from the fourth power units, and controlling the output voltage of the fifth power units to be the second output voltage.
The fifth power unit may be a power unit corresponding to the number of the third power units obtained from the fourth power unit.
For example, if there are 4 third power units and 5 fourth power units, the output voltages of the 4 fourth power units may be set to the second output voltage. The polarities of the second output voltage and the first output voltage are opposite, for example, if the first output voltage is U, the second output voltage is-U.
In connection with the example in step 207, the output voltages of 4 fourth power cells among Q8, Q9, Q10, Q11, Q12 may be set to the second output voltage.
Optionally, if the bridge arm current is greater than 0, when the fifth power units with the same number as the third power units are obtained from the fourth power units with a larger number, the second battery clusters corresponding to the fourth power units may be first sorted according to the order of the charge states from the large to the small, and then the fifth power units with the same number as the third power units are selected from the fourth power units from the large to the small.
For example, if the states of charge corresponding to Q8, Q9, Q10, Q11, Q12 are 0.5, 0.6, 0.4, 0.25, 0.7, respectively, Q8, Q9, Q10, Q11, Q12 may be ranked as Q12, Q9, Q8, Q10, Q11, and if there are 4 third power units, 4 fourth power units of Q12, Q9, Q8, Q10 may be used as the currently selected fifth power unit.
Alternatively, if the bridge arm current is less than or equal to 0, when the fifth power units with the same number as the third power units are obtained from the fourth power units with a larger number, the fourth power units may be first sorted in order of the states of charge from small to large, and then the fifth power units with the same number as the third power units are selected from the fourth power units from small to large.
For example, if the states of charge corresponding to Q8, Q9, Q10, Q11, Q12 are 0.5, 0.6, 0.4, 0.25, 0.7, respectively, Q8, Q9, Q10, Q11, Q12 may be ranked as Q11, Q10, Q8, Q9, Q12, and if there are 4 third power units, 4 fourth power units of Q11, Q10, Q8, Q9 may be used as the currently selected fifth power unit.
Step 209, controlling output voltages of the power units other than the third power unit, the fifth power unit and the first power unit in the power units of the bridge arm to be zero level.
Note that if 12 power units are included in the bridge arm, and Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, and Q12 are respectively included, where Q1, Q2, and Q3 are known as the first power unit, Q4, Q5, and Q6 are known as the third power unit, and Q7, Q8, and Q9 are known as the fifth power unit, the output voltages of Q10, Q11, and Q12 may be set to zero level.
It should be noted that the above examples are only illustrative, and are not meant to limit the present disclosure.
In step 210, when the number of the fourth power units is less than or equal to the number of the third power units, the output voltage of the fourth power units is controlled to be the second output voltage.
For example, if there are 5 third power units and 4 fourth power units, the output voltages of the 4 fourth power units may be set to the second output voltage.
For example, if the bridge arm includes 12 power units, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, and Q12, respectively, where Q1, Q2, and Q3 are known as a first power unit, Q4, Q5, Q6, and Q7 are known as a fourth power unit, and Q8, Q9, Q10, Q11, and Q12 are known as a third power unit, wherein since there are 5 third power units and 4 fourth power units, the output voltages of Q4, Q5, Q6, and Q7 may be set as the second output voltages in order to pair the third power unit and the fourth power unit.
Step 211, obtaining the sixth power units with the same number as the fourth power units from the third power units, and controlling the output voltages of the sixth power units and the first power units to be the first output voltage.
The sixth rate unit may be a number of power units corresponding to the fourth power unit obtained from the third power unit.
For example, if there are 5 third power units and 4 fourth power units, the output voltages of the 4 third power units may be set to the first output voltage. The polarities of the second output voltage and the first output voltage are opposite, for example, if the first output voltage is U, the second output voltage is-U.
In connection with the example in step 210, the output voltages of 4 third power cells among Q8, Q9, Q10, Q11, Q12 may be set to the first output voltage, and the output voltages of Q1, Q2, Q3 may be set to the first output voltage.
Alternatively, if the bridge arm current is greater than 0, when the sixth power units with the same number as the fourth power units are obtained from the third power units with a larger number, the fourth power units may be first sorted in order of the states of charge from small to large, and then the sixth power units with the same number as the fourth power units are selected from the third power units from small to large.
For example, if the states of charge corresponding to Q8, Q9, Q10, Q11, Q12 are 0.5, 0.6, 0.4, 0.25, 0.7, respectively, Q8, Q9, Q10, Q11, Q12 may be ranked as Q11, Q10, Q8, Q9, Q12, and if there are 4 fourth power units, the 4 third power units of Q11, Q10, Q8, Q9 may be regarded as the sixth power unit currently selected.
Alternatively, if the bridge arm current is less than or equal to 0, when the sixth power units with the same number as the fourth power units are obtained from the third power units with a larger number, the third power units may be first sorted in the order of from the high state of charge to the low state of charge, and then the sixth power units with the same number as the fourth power units are selected from the third power units from the high state of charge to the low state of charge.
For example, if the states of charge corresponding to Q8, Q9, Q10, Q11, Q12 are 0.5, 0.6, 0.4, 0.25, 0.7, respectively, Q8, Q9, Q10, Q11, Q12 may be ranked as Q12, Q9, Q8, Q10, Q11, and if there are 4 fourth power units, the 4 third power units of Q12, Q9, Q8, Q10 may be the sixth power unit currently selected.
And step 212, controlling output voltages of the power units except the third power unit, the sixth power unit and the first power unit in the power units of the bridge arm to be zero level.
Note that if 12 power units are included in the bridge arm, and Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, and Q12 are respectively included, where Q1, Q2, and Q3 are known as the first power unit, Q4, Q5, and Q6 are known as the third power unit, and Q7, Q8, and Q9 are known as the sixth power unit, the output voltages of Q10, Q11, and Q12 may be set to zero level.
It should be noted that the above examples are only illustrative, and are not meant to limit the present disclosure.
In summary, if the bridge arm current is positive, the current flowing through the upper bus bar cluster (the first cluster) will charge the corresponding cluster, and the current flowing through the lower bus bar cluster (the second cluster) will discharge the corresponding cluster. Otherwise, if the current flowing into the power unit is negative, the current flowing through the upper bus battery cluster discharges the corresponding battery cluster, the current flowing through the lower bus battery cluster charges the corresponding battery cluster, and the discharging and charging conditions can be selected according to the state of charge of each battery cluster, so that the process of balancing the state of charge is very accurate when the voltage is distributed, and the problem of uneven SOC of the battery clusters is effectively solved.
In order to implement the above embodiment, the present disclosure further proposes a voltage distribution device for a multi-battery cluster.
Fig. 4 is a block diagram of a voltage distribution device for a multi-battery cluster according to a fourth embodiment of the present disclosure.
As shown in fig. 4, the voltage distribution apparatus 400 of the multi-cell cluster may include:
an obtaining module 410, configured to obtain a reference voltage of a bridge arm, a bridge arm current, and a first output voltage, and a state of charge of each battery cluster corresponding to each power unit in the bridge arm, where each battery cluster includes a plurality of first battery clusters and a plurality of second battery clusters;
a first calculation module 420 for calculating a first number of first power cells based on the reference voltage and the first output voltage;
a selecting module 430, configured to select the first number of the first power units from the power units according to the magnitude of the bridge arm current;
a second calculating module 440, configured to calculate, based on the first number, a second number of second power units remaining in the respective power units currently;
and an allocation module 450, configured to allocate an output voltage corresponding to each power unit based on the second number, the magnitude of the bridge arm current, and the state of charge of each battery cluster.
Optionally, the first calculating module 420 is specifically configured to:
Calculating a ratio of the reference voltage and the first output voltage;
based on the ratio, a first number of the first power cells is calculated.
Optionally, the selection module 430 is specifically configured to:
according to the order of the charge states from small to large, sorting a plurality of power units corresponding to the plurality of first battery clusters according to the charge states corresponding to the plurality of first battery clusters;
and under the condition that the bridge arm current is larger than zero, acquiring the first number of the first power units from small to large based on the ordering of the plurality of power units.
Optionally, the selection module 430 is specifically configured to:
according to the order of the charge states from small to large, sorting a plurality of power units corresponding to the plurality of first battery clusters according to the charge states corresponding to the plurality of first battery clusters;
and acquiring the first number of the first power units from large to small based on the ordering of the plurality of power units under the condition that the bridge arm current is smaller than or equal to zero.
Optionally, the allocation module is specifically configured to:
and under the condition that the second number is smaller than a preset threshold value, controlling the output voltage of the second power unit to be zero level, and controlling the output voltage of the first power unit to be a first output voltage.
Optionally, the allocation module includes:
the first calculating unit is used for calculating a first average value of a plurality of first battery clusters corresponding to the bridge arm and a second average value corresponding to the plurality of second battery clusters according to the charge states of the battery clusters in the bridge arm under the condition that the second number is larger than the preset threshold;
a judging unit, configured to judge whether there are a third power unit satisfying a first preset condition and a fourth power unit satisfying a second preset condition based on a preset condition related to the magnitude of the bridge arm current and a state of charge of a battery cluster corresponding to the second power unit, the first average value, and the second average value, where the preset condition includes the first preset condition and the second preset condition;
a first control unit configured to control output voltages of the third power unit and the first power unit to be a first output voltage in a case where the number of the third power unit is less than or equal to the fourth power unit;
the second control unit is used for acquiring fifth power units, the number of which is the same as that of the third power units, from the fourth power units and controlling the output voltage of the fifth power units to be a second output voltage;
And the third control unit is used for controlling the output voltage of the power units except the third power unit, the fifth power unit and the first power unit in the power units of the bridge arm to be zero level.
Optionally, the judging unit is further used for
Controlling the output voltage of the fourth power unit to be a second output voltage under the condition that the number of the fourth power unit is smaller than or equal to the third power unit;
obtaining sixth power units, the number of which is the same as that of the fourth power units, from the third power units, and controlling the output voltages of the sixth power units and the first power units to be first output voltages;
and controlling the output voltages of the power units except the third power unit, the sixth power unit and the first power unit in the power units of the bridge arm to be zero level.
Optionally, the judging unit is specifically configured to:
judging whether the charge state of the first battery cluster corresponding to each second power unit is larger than the first average value or not under the condition that the bridge arm current is larger than zero, and determining the second power unit with the charge state of the corresponding first battery cluster larger than the first average value as a third power unit;
And judging whether the charge state of the second battery cluster corresponding to each second power unit is smaller than the second average value, and determining the second power unit of which the charge state of the corresponding second battery cluster is smaller than the second average value as a fourth power unit.
Optionally, the judging unit is specifically configured to:
judging whether the charge state of the first battery cluster corresponding to each second power unit is smaller than the first average value or not under the condition that the bridge arm current is smaller than or equal to zero, and determining the second power unit with the charge state smaller than the first average value of the corresponding first battery cluster as a third power unit;
and judging whether the charge state of the second battery cluster corresponding to each second power unit is larger than the second average value, and determining the second power unit with the charge state of the corresponding second battery cluster larger than the second average value as a fourth power unit.
In the embodiment of the disclosure, the device firstly obtains a reference voltage, a bridge arm current and a first output voltage of a bridge arm, and a state of charge of each battery cluster corresponding to each power unit in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters, then calculates a first number of first power units based on the reference voltage and the first output voltage, then selects the first number of first power units from the power units according to the magnitude of bridge arm current, then calculates a second number of remaining second power units in the power units based on the first number, and finally distributes the output voltage corresponding to each power unit based on the second number, the magnitude of bridge arm current and the state of charge of each battery cluster. Therefore, the output voltage of each power unit can be flexibly selected through the current direction and the charge state of the battery cluster of the submodule, the problem of uneven voltage SOC of the battery cluster can be further solved, the energy of the battery energy storage system is finely managed on the control level, the possibility of occurrence of faults of the battery cluster is reduced, the normal operation of an independent energy storage power station is further ensured, and the flexibility and the economic benefit of a traditional thermal power plant are improved.
In order to achieve the above embodiments, the present disclosure further proposes an energy storage system control device, including: the voltage distribution method for the multi-battery cluster comprises a memory, a processor and an energy storage system control program which is stored in the memory and can run on the processor, wherein the processor realizes the voltage distribution method for the multi-battery cluster according to the embodiment of the disclosure when executing the program.
In order to implement the foregoing embodiments, the present disclosure further proposes a non-transitory computer readable storage medium storing an energy storage system control program, which when executed by a processor implements a voltage distribution method of a multi-battery cluster as proposed in the foregoing embodiments of the present disclosure.
Fig. 5 illustrates a block diagram of an exemplary computer device suitable for use in implementing embodiments of the present disclosure. The computer device 12 shown in fig. 5 is merely an example and should not be construed as limiting the functionality and scope of use of the disclosed embodiments. As one example, the computer device may be an energy storage system control device.
As shown in FIG. 5, the computer device 12 is in the form of a general purpose computing device. Components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.
Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, and a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include industry Standard architecture (Industry Standard Architecture; hereinafter ISA) bus, micro channel architecture (Micro Channel Architecture; hereinafter MAC) bus, enhanced ISA bus, video electronics standards Association (Video Electronics Standards Association; hereinafter VESA) local bus, and peripheral component interconnect (Peripheral Component Interconnection; hereinafter PCI) bus.
Computer device 12 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
Memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (Random Access Memory; hereinafter: RAM) 30 and/or cache memory 32. The computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, commonly referred to as a "hard disk drive"). Although not shown in fig. 5, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a compact disk read only memory (Compact Disc Read Only Memory; hereinafter CD-ROM), digital versatile read only optical disk (Digital Video Disc Read Only Memory; hereinafter DVD-ROM), or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of the various embodiments of the disclosure.
A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods in the embodiments described in this disclosure.
The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), one or more devices that enable a user to interact with the computer device 12, and/or any devices (e.g., network card, modem, etc.) that enable the computer device 12 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. Moreover, the computer device 12 may also communicate with one or more networks such as a local area network (Local Area Network; hereinafter LAN), a wide area network (Wide Area Network; hereinafter WAN) and/or a public network such as the Internet via the network adapter 20. As shown, network adapter 20 communicates with other modules of computer device 12 via bus 18. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with computer device 12, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, for example, implementing the methods mentioned in the foregoing embodiments.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

Claims (9)

1. A method of voltage distribution for a multi-cell cluster, comprising:
acquiring reference voltage, bridge arm current and first output voltage of a bridge arm and charge states of battery clusters corresponding to power units in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters;
Calculating a first number of first power cells based on the reference voltage and the first output voltage;
selecting the first number of the first power units from the power units according to the magnitude of the bridge arm current;
calculating a second number of remaining second power cells in the respective power cells based on the first number;
distributing output voltages corresponding to each power unit based on the second quantity, the magnitude of the bridge arm current and the charge state of each battery cluster;
the distributing the output voltage corresponding to each power unit based on the second number, the magnitude of the bridge arm current and the state of charge of each battery cluster includes:
under the condition that the second number is larger than a preset threshold value, respectively calculating a first average value of a plurality of first battery clusters corresponding to the bridge arm and a second average value corresponding to the plurality of second battery clusters according to the charge states of the battery clusters in the bridge arm;
judging whether a third power unit meeting a first preset condition and a fourth power unit meeting a second preset condition exist or not based on preset conditions related to the magnitude of the bridge arm current and the charge state of a battery cluster corresponding to the second power unit, the first average value and the second average value, wherein the preset conditions comprise the first preset condition and the second preset condition;
Controlling the output voltages of the third power unit and the first power unit to be first output voltages under the condition that the number of the third power unit is smaller than or equal to that of the fourth power unit;
obtaining fifth power units with the same number as the third power units from the fourth power units, and controlling the output voltage of the fifth power units to be a second output voltage;
and controlling the output voltages of the power units except the third power unit, the fifth power unit and the first power unit in the power units of the bridge arm to be zero level.
2. The method of claim 1, wherein the calculating a first number of first power cells based on the reference voltage and the first output voltage comprises:
calculating a ratio of the reference voltage and the first output voltage;
based on the ratio, a first number of the first power cells is calculated.
3. The method of claim 1, wherein said selecting said first number of said power cells from said respective power cells based on a magnitude of said leg current comprises:
According to the order of the charge states from small to large, sorting a plurality of power units corresponding to the plurality of first battery clusters according to the charge states corresponding to the plurality of first battery clusters;
and under the condition that the bridge arm current is larger than zero, acquiring the first number of the first power units from small to large based on the ordering of the plurality of power units.
4. The method of claim 1, wherein said selecting said first number of said power cells from said respective power cells based on a magnitude of said leg current comprises:
according to the order of the charge states from small to large, sorting a plurality of power units corresponding to the plurality of first battery clusters according to the charge states corresponding to the plurality of first battery clusters;
and acquiring the first number of the first power units from large to small based on the ordering of the plurality of power units under the condition that the bridge arm current is smaller than or equal to zero.
5. The method of claim 3 or 4, wherein the assigning the corresponding output voltage of each of the power cells based on the second number and the state of charge of each of the battery clusters comprises:
And under the condition that the second number is smaller than a preset threshold value, controlling the output voltage of the second power unit to be zero level, and controlling the output voltage of the first power unit to be a first output voltage.
6. The method of claim 1, further comprising, after said determining whether there is a third power unit satisfying the first preset condition and a fourth power unit satisfying the second preset condition:
controlling the output voltage of the fourth power unit to be a second output voltage under the condition that the number of the fourth power unit is smaller than or equal to the third power unit;
obtaining sixth power units, the number of which is the same as that of the fourth power units, from the third power units, and controlling the output voltages of the sixth power units and the first power units to be first output voltages;
and controlling the output voltages of the power units except the third power unit, the sixth power unit and the first power unit in the power units of the bridge arm to be zero level.
7. The method of claim 1, wherein the determining whether there is a third power cell satisfying a first preset condition and a fourth power cell satisfying a second preset condition based on a preset condition associated with the magnitude of the bridge arm current and a state of charge of a battery cluster corresponding to the second power cell, the first average value, and the second average value, comprises:
Judging whether the charge state of the first battery cluster corresponding to each second power unit is larger than the first average value or not under the condition that the bridge arm current is larger than zero, and determining the second power unit with the charge state of the corresponding first battery cluster larger than the first average value as a third power unit;
and judging whether the charge state of the second battery cluster corresponding to each second power unit is smaller than the second average value, and determining the second power unit of which the charge state of the corresponding second battery cluster is smaller than the second average value as a fourth power unit.
8. The method of claim 1, wherein the determining whether there is a third power cell satisfying a first preset condition and a fourth power cell satisfying a second preset condition based on a preset condition associated with the magnitude of the bridge arm current and a state of charge of a battery cluster corresponding to the second power cell, the first average value, and the second average value, comprises:
judging whether the charge state of the first battery cluster corresponding to each second power unit is smaller than the first average value or not under the condition that the bridge arm current is smaller than or equal to zero, and determining the second power unit with the charge state smaller than the first average value of the corresponding first battery cluster as a third power unit;
And judging whether the charge state of the second battery cluster corresponding to each second power unit is larger than the second average value, and determining the second power unit with the charge state of the corresponding second battery cluster larger than the second average value as a fourth power unit.
9. A voltage distribution device for a multi-cell cluster, comprising:
the power supply device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring reference voltage, bridge arm current and first output voltage of a bridge arm and charge states of battery clusters corresponding to power units in the bridge arm, wherein each battery cluster comprises a plurality of first battery clusters and a plurality of second battery clusters;
a first calculation module for calculating a first number of first power cells based on the reference voltage and the first output voltage;
a selection module, configured to select the first number of the first power units from the power units according to the magnitude of the bridge arm current;
a second calculating module, configured to calculate, based on the first number, a second number of second power units remaining in the respective power units currently;
the distribution module is used for distributing the output voltage corresponding to each power unit based on the second quantity, the bridge arm current and the charge state of each battery cluster;
A dispensing module comprising:
the first calculating unit is used for calculating a first average value of a plurality of first battery clusters corresponding to the bridge arm and a second average value corresponding to the plurality of second battery clusters according to the charge states of the battery clusters in the bridge arm under the condition that the second number is larger than a preset threshold value;
a judging unit, configured to judge whether there are a third power unit satisfying a first preset condition and a fourth power unit satisfying a second preset condition based on a preset condition related to the magnitude of the bridge arm current and a state of charge of a battery cluster corresponding to the second power unit, the first average value, and the second average value, where the preset condition includes the first preset condition and the second preset condition;
a first control unit configured to control output voltages of the third power unit and the first power unit to be a first output voltage in a case where the number of the third power unit is less than or equal to the fourth power unit;
the second control unit is used for acquiring fifth power units, the number of which is the same as that of the third power units, from the fourth power units and controlling the output voltage of the fifth power units to be a second output voltage;
And the third control unit is used for controlling the output voltage of the power units except the third power unit, the fifth power unit and the first power unit in the power units of the bridge arm to be zero level.
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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011065253A1 (en) * 2009-11-26 2011-06-03 株式会社日立製作所 Power conversion device
JP2016063578A (en) * 2014-09-16 2016-04-25 日本車輌製造株式会社 Secondary battery control device
CN108092352A (en) * 2017-11-27 2018-05-29 浙江大学 A kind of modulator approach suitable for the state-of-charge equilibrium of multimode battery modules
CN113690914A (en) * 2021-07-08 2021-11-23 国网河北省电力有限公司电力科学研究院 Energy storage railway power regulator and control method thereof
WO2021244641A1 (en) * 2020-06-04 2021-12-09 比亚迪股份有限公司 Battery energy processing apparatus and method, and vehicle
CN114844181A (en) * 2022-07-01 2022-08-02 中国华能集团清洁能源技术研究院有限公司 Equalization system of battery cluster
CN114884078A (en) * 2022-01-28 2022-08-09 上海交通大学 High-voltage direct-hanging system integrating reactive compensation and energy storage
WO2022198564A1 (en) * 2021-03-25 2022-09-29 华为数字能源技术有限公司 Energy storage system control method and energy storage system
CN115378102A (en) * 2022-10-25 2022-11-22 佛山和储能源科技有限公司 Full current balancing method for state of charge of energy storage system
CN115800414A (en) * 2022-06-10 2023-03-14 宁德时代新能源科技股份有限公司 Adjusting system and energy storage system and adjusting method thereof
CN115940228A (en) * 2022-12-03 2023-04-07 广东迪度新能源有限公司 Grid-connected energy storage system with modular multilevel topological structure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115833404A (en) * 2021-09-17 2023-03-21 华为数字能源技术有限公司 Energy storage system, uninterruptible power supply and battery balancing method

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011065253A1 (en) * 2009-11-26 2011-06-03 株式会社日立製作所 Power conversion device
JP2016063578A (en) * 2014-09-16 2016-04-25 日本車輌製造株式会社 Secondary battery control device
CN108092352A (en) * 2017-11-27 2018-05-29 浙江大学 A kind of modulator approach suitable for the state-of-charge equilibrium of multimode battery modules
WO2021244641A1 (en) * 2020-06-04 2021-12-09 比亚迪股份有限公司 Battery energy processing apparatus and method, and vehicle
WO2022198564A1 (en) * 2021-03-25 2022-09-29 华为数字能源技术有限公司 Energy storage system control method and energy storage system
CN113690914A (en) * 2021-07-08 2021-11-23 国网河北省电力有限公司电力科学研究院 Energy storage railway power regulator and control method thereof
CN114884078A (en) * 2022-01-28 2022-08-09 上海交通大学 High-voltage direct-hanging system integrating reactive compensation and energy storage
CN115800414A (en) * 2022-06-10 2023-03-14 宁德时代新能源科技股份有限公司 Adjusting system and energy storage system and adjusting method thereof
CN114844181A (en) * 2022-07-01 2022-08-02 中国华能集团清洁能源技术研究院有限公司 Equalization system of battery cluster
CN115378102A (en) * 2022-10-25 2022-11-22 佛山和储能源科技有限公司 Full current balancing method for state of charge of energy storage system
CN115940228A (en) * 2022-12-03 2023-04-07 广东迪度新能源有限公司 Grid-connected energy storage system with modular multilevel topological structure

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Analysis and control of modular multilevel converters with integrated battery energy storage;Vasiladiotis M;《 Power Electronics》;第163-175页 *
基于模块化多电平变流器的 电池储能系统荷电状态均衡控制策略;郭龙等;《电网技术》;第2688-2694页 *

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