Control system and method for multi-branch battery system

Abstract

The present disclosure discloses a control system and method for a multi-branch battery system, the system including: an energy management system controller for monitoring data of an energy storage subsystem in real time and sending a scheduling command to a corresponding battery master controller unit; a first end of each master controller unit is connected to the energy management system controller, and a second end is connected to a first end of a corresponding plurality of energy storage converters, and the first end of each master controller unit is used for monitoring data of the corresponding energy storage unit and uploading it to the energy management system controller, performing redundant control of a failed energy storage unit, and making power equalization adjustment according to the maximum charge / discharge capacity of each detected energy storage unit; a second end of each energy storage converter is connected to a corresponding battery cluster controller, and each battery cluster controller is connected to a third end of the corresponding battery master controller unit.

Description

[Technical Field]

[0001] The present disclosure relates to the field of energy storage technology, and more particularly to a control system and method for a multi-branch battery system. Cross-Citation of Related Applications This application is filed based on and claims priority from a Chinese patent application bearing application number 202210940362.3 and filed on August 5, 2022, the entire contents of which are incorporated herein by reference. [Background technology]

[0002] With the development of new energy technologies, the proportion of energy storage systems in various fields such as small-scale power grid energy storage, wind power field, photovoltaic field electric energy leveling, power grid adjustment, etc. is becoming increasingly large, and they are an important component and key technology in systems such as smart power grids, renewable energy systems, and energy internet. Currently, they are being applied to peak load adjustment, frequency regulation, battery cascade use, emergency power supply, and peak shaving in energy storage power plants.

[0003] Related technologies generally use a method in which battery clusters are paralleled and directly connected to a process control system (PCS), but this method has high requirements for battery consistency. After a period of operation, if a battery mismatch or module failure occurs, a mismatch will also occur between the battery clusters, causing the PCS system to operate at a lower power as a low-power battery cluster, affecting the output of the storage system. In order to meet the different levels of power demand in the power system and fully utilize the performance advantages of energy storage equipment, more and more energy storage systems are using an AC bus multi-branch integration method to achieve decoupling and segmented management between battery clusters, avoiding the impact of battery mismatch caused by direct parallel connection.

[0004] However, multi-branch battery systems have many battery types with different decay characteristics, which results in different capacities for each branch, which can affect the stability of the output power of the energy storage system. In other words, multi-branch battery systems in related technologies have many battery types, low consistency, difficult state assessment, and high safety risks, which result in unstable output power of the energy storage system. Summary of the Invention [Means for solving the problem]

[0005] An embodiment of a first aspect of the present disclosure provides a control system for a multi-branch battery system, the system including: An energy management system (EMS) controller, a plurality of battery master controller units (BAMS), a plurality of energy storage converters and a plurality of battery cluster controllers (BCMS), each of the battery cluster controllers (BCMS) is connected to a corresponding battery cluster, and each battery cluster is further connected to a corresponding one of the energy storage converters to form an energy storage unit, wherein: The energy management system EMS controller is used for monitoring data of energy storage subsystems in real time, and sending a first equalization distribution scheduling command to the corresponding battery master controller unit BAMS according to the maximum charge / discharge capacity of each of the energy storage subsystems; a first end of each of the battery master controller units BAMS is connected to the energy management system EMS controller, and a second end of each of the battery master controller units BAMS is connected to first ends of a corresponding plurality of the energy storage converters, and the battery master controller unit BAMS is used to monitor data of each of the corresponding energy storage units in real time and upload the monitored data to the energy management system EMS controller; When any number of energy storage units among all the corresponding energy storage units fail, the battery master controller unit BAMS is also used to perform redundant control of the failed energy storage units, and perform equalization adjustment of power based on the detected maximum charge / discharge capacity of each of the energy storage units, thereby realizing equalization control of residual charge SOC between battery clusters; A second end of each of the energy storage converters is connected to a corresponding battery cluster controller BCMS, and each of the battery cluster controllers BCMS is connected to a third end of a corresponding battery master controller unit BAMS.

[0006] In some embodiments, all energy storage units corresponding to one said battery master controller unit BAMS constitute one said energy storage subsystem.

[0007] In some embodiments, the energy management system EMS controller is also used to receive a second equalization distribution scheduling command sent from an external monitoring system and send the second equalization distribution scheduling command to the corresponding battery master controller unit BAMS.

[0008] In some embodiments, the battery master controller unit BAMS is also used to perform the power equalization adjustment based on the received first equalization distribution scheduling command and / or the second equalization distribution scheduling command.

[0009] In some embodiments, the system further includes a plurality of energy storage converter controllers EMU, a first end of each of the energy storage converter controllers EMU is connected to a second end of a corresponding one of the battery master controller units BAMS, and a second end of each of the energy storage converter controllers EMU is connected to first ends of a corresponding one of the plurality of energy storage converters, and the battery master controller unit BAMS is also used to perform modular independent control over each of the corresponding energy storage converters through the energy storage converter controller EMU.

[0010] In some embodiments, the battery master controller unit BAMS specifically uses the following formula to calculate the power of each of the energy storage units when each battery cluster in the energy storage subsystem in which it is located operates normally and the residual charge SOC of each branch is equalized:

number

number

number

[0011] In some embodiments, the battery master controller unit BAMS is specifically used to determine the weight of the energy storage unit by the following formula: JPEG0007795852000005.jpg40148 where w i is the weight of the i-th energy storage unit, n is the number of energy storage units, and SOC i is the residual charge SOC value of the second energy storage unit, SOC Q1 is the lower quartile of the residual charge SOC value of each energy storage unit in the energy storage system, SOC Q2 is the median residual charge SOC value of each energy storage unit in the energy storage system, SOC Q3 is the upper quartile of the residual charge SOC value of each energy storage unit in the energy storage system, and i and n are positive integers.

[0012] In some embodiments, the energy storage units of each of the energy storage subsystems can be expanded, and the number of energy storage units included in each of the energy storage subsystems can be equal or unequal, and each of the energy storage subsystems can support multiple types of battery clusters to form a mixed energy storage system, and the battery master controller unit BAMS is also used to monitor data of corresponding different types of battery clusters and exercise independent control over each corresponding battery cluster.

[0013] An embodiment of a second aspect of the present invention provides a control method for a multi-branch battery system, which is used in the control system of the multi-branch battery system described above, and includes: Monitor data of the energy storage subsystems in real time through an energy management system EMS controller, and send a first equalization distribution scheduling command to a corresponding battery master controller unit BAMS based on the maximum charge / discharge capacity of each of the energy storage subsystems; Monitor data of each energy storage unit in real time through the battery master controller unit BAMS, and upload the monitored data to a corresponding energy management system EMS controller; When any number of energy storage units fail, the failed energy storage units are redundantly controlled through the battery master controller unit BAMS, and power equalization adjustment is performed based on the detected maximum charge / discharge capacity of each of the energy storage units, thereby realizing equalization control of residual charge SOC between battery clusters.

[0014] A third embodiment of the present invention provides an electronic device including the control system for the multi-branch battery system described in the above embodiment.

[0015] Additional aspects and advantages of the present disclosure will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present disclosure. [Brief explanation of the drawings]

[0016] The above and / or additional aspects and advantages of the present disclosure will become more apparent and easier to understand from the following description of examples taken in conjunction with the following drawings. [Figure 1] 1 is a schematic diagram of the structure of a control system of a multi-branch battery system proposed by an embodiment of the present disclosure; [Figure 2] 1 is a schematic diagram of the structure of a control system of a multi-branch battery system in some embodiments of the present disclosure; [Figure 3] 1 is a schematic diagram of the principle of calculating the weight of an energy storage unit according to an embodiment of the present disclosure; FIG. [Figure 4]1 is a flowchart of a control method for a multi-branch battery system according to an embodiment of the present disclosure; [Figure 5] 1 is a flowchart illustrating a control method for a multi-branch battery system according to some embodiments of the present disclosure. [Figure 6] 1 is a schematic diagram of the structure of an electronic device proposed by an embodiment of the present disclosure; DETAILED DESCRIPTION OF THE INVENTION

[0017] The following detailed description of the embodiments of the present disclosure is provided below. The embodiments are illustrated in the drawings, and the same or similar reference numerals throughout the drawings represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are merely examples for explaining the present disclosure, and are not intended to limit the present disclosure.

[0018] Hereinafter, a control system for a multi-branch battery system according to an embodiment of the present disclosure will be described with reference to the drawings.

[0019] 1 is a schematic diagram of the control system structure of a multi-branch battery system proposed by an embodiment of the present disclosure. As shown in FIG. 1, the system includes an energy management system (EMS) controller 10, a plurality of battery master controller units (BAMS) 20, a plurality of energy storage converters 30, and a plurality of battery cluster controllers (BCMS) 40.

[0020] Here, each battery cluster controller BCMS 40 is connected to a corresponding battery cluster, i.e., each battery cluster in the energy storage system has a corresponding battery cluster controller as a slave controller for the battery cluster. Since a battery cluster controller is fixedly associated with one battery cluster, the battery cluster can be represented as a BCMS in the following description of the present disclosure. The energy storage converter corresponding to a battery cluster is the energy storage converter in the same branch as the current battery cluster. As can be seen from FIG. 1, the energy storage converters and battery clusters of the present disclosure have a multi-branch topology, and each battery cluster is also connected to a corresponding energy storage converter 30 as one branch of the control system of the present disclosure to form an energy storage unit 60 (shown in FIG. 2). In the figure, x, n, and m are symbols used to distinguish between the battery master controller units, energy storage converters, and battery cluster controllers in different energy storage systems.

[0021] In some embodiments, the energy management system EMS controller 10 (hereinafter referred to as EMS controller 10) is used to monitor data of the energy storage subsystems in real time and send a first equalization distribution scheduling command to the corresponding battery master controller unit BAMS20 (hereinafter referred to as BAMS controller 20) based on the maximum charge / discharge capacity of each energy storage subsystem.

[0022] Here, the energy storage subsystem is one subsystem in the AC-side parallel energy storage system, and each energy storage subsystem is in parallel to form an energy storage system corresponding to the control system of the multi-branch battery system of the present disclosure. In one embodiment of the present disclosure, all energy storage units corresponding to one battery master controller unit BAMS20 can form one energy storage subsystem, that is, all energy storage units currently connected to the BAMS controller 20 are used as the energy storage subsystem corresponding to the current BAMS controller 20.

[0023] In an embodiment of the present disclosure, the EMS controller 10 communicates with each BAMS controller 20 in real time, monitors each energy storage subsystem in real time based on the received data, and when a battery cluster in one or more energy storage subsystems fails, sends an equalization distribution scheduling command to the corresponding battery master controller unit BAMS20 based on the maximum charge / discharge capacity of the energy storage subsystem, and the corresponding battery master controller unit BAMS20 is the BAMS controller corresponding to the energy storage subsystem that has failed and needs power equalization adjustment.

[0024] In one embodiment of the present disclosure, the EMS controller 10 is also used to receive a second equalization distribution scheduling command sent from an external monitoring system and send the second equalization distribution scheduling command to the corresponding battery master controller unit BAMS 20. In this embodiment, an external monitoring system is preset to monitor the status of the multi-branch battery system in real time, and when one or more battery clusters fail, the external monitoring system calculates and sends the equalization distribution scheduling command through logic functions such as data statistics to the EMS controller 10, which then sends it to the corresponding BAMS controller 20.

[0025] A first end of each battery master controller unit BAMS20 is connected to the energy management system EMS controller 10, and a second end of each battery master controller unit BAMS20 is connected to the first ends of the corresponding plurality of energy storage converters 30, and the battery master controller unit BAMS20 is used to monitor the data of each corresponding energy storage unit in real time and upload the monitored data to the energy management system EMS controller 10.

[0026] In some embodiments, the energy storage subsystem corresponding to each BAMS controller 20 may include multiple energy storage units, so the multiple energy storage converters 30 connected to the second end of the BAMS controller 20 are all the energy storage converters 30 in the energy storage subsystem corresponding to the current BAMS controller 20. The BAMS controller 20 is used to monitor data from each energy storage unit in real time and upload it to the EMS controller 10, which then aggregates the data from each energy storage unit in each energy storage subsystem to achieve real-time monitoring of the data from each energy storage subsystem. The data from each energy storage unit may be an operating parameter, such as the output power of the energy storage unit, and the operating status of each energy storage unit can be determined based on the magnitude of the monitored data. For example, if the output power of a certain energy storage unit is detected to be zero, it can be determined that the battery cluster in that energy storage unit is faulty.

[0027] When any number of the corresponding energy storage units fail, the battery master controller unit BAMS20 performs redundant control of the failed energy storage units, performs power equalization adjustment based on the detected maximum charge / discharge capacity of each energy storage unit, and also realizes equalization control of the residual charge SOC between the battery clusters.

[0028] Here, all the corresponding energy storage units refer to the energy storage units included in the energy storage subsystem currently corresponding to the BAMS controller 20. The term "any number" means that the number of energy storage units in which a failure has occurred may be one or more.

[0029] In some embodiments, the BAMS controller 20 can perform single-branch modular control for devices such as energy storage battery clusters and energy storage converters to ensure the system's power response speed. Single-branch modular control refers to the fact that the BAMS controller 20 has coordinated control capabilities. When one or more energy storage units in a cluster fail, the BAMS controller 20 independently executes a redundant control strategy for the failed branch, disconnecting the failed battery cluster in a timely manner to ensure the normal operation of the remaining battery clusters and improving the stability of the system's power support. After executing the redundant control strategy, the BAMS controller 20 performs equalized energy distribution for the remaining normally operating battery clusters. Specifically, it performs power equalization adjustment based on the detected maximum charging and discharging power of each energy storage unit, achieving equalized control of the residual charge SOC between the battery clusters and ensuring stable power output from the system.

[0030] In one embodiment of the present disclosure, the battery master controller unit BAMS20 is also used to make power equalization adjustments based on the received first equalization distribution scheduling command and / or second equalization distribution scheduling command.

[0031] As can be seen from the above description, the control system for the multi-branch battery system disclosed herein can control the BAMS controller 20 to perform redundancy control and power equalization adjustment in at least three ways when any number of energy storage units fail. Specifically, the EMS controller 10 makes a decision based on monitored data from the energy storage subsystem, performs power equalization adjustment, and sends an equalization distribution scheduling command to the BAMS controller 20. The EMS controller 10 receives an equalization distribution scheduling command from an external monitoring system and sends it to the BAMS controller 20. If the BAMS controller 20 determines that an energy storage unit has failed based on the monitored data from each energy storage unit, it performs redundant control for the failed energy storage unit and performs power equalization adjustment based on the detected maximum charge / discharge capacity of each energy storage unit. When a battery cluster fails, the EMS controller 10 and the external monitoring system simultaneously detect the battery cluster failure and send a power equalization distribution scheduling command. The BAMS controller 20 may simultaneously receive a first equalization distribution scheduling command and a second equalization distribution scheduling command, or may receive either the first equalization distribution scheduling command or the second equalization distribution scheduling command separately. It is understood that the BAMS controller 20 can receive a first equalization distribution scheduling command and / or a second equalization distribution scheduling command and perform power equalization adjustment in some scenes when it self-detects that power equalization distribution scheduling is required.

[0032] As a result, the control system of the multi-branch battery system disclosed herein can perform power equalization adjustment in several ways, be applicable to different work scenarios, and better ensure the stability of the output power of the energy storage system when multiple battery clusters fail.

[0033] To facilitate the single-branch control of the energy storage converter 30 by the BAMS controller 20, the present disclosure also provides a specific control system for a multi-branch battery system. Figure 2 is a schematic diagram of the structure of a specific control system for a multi-branch battery system proposed by an embodiment of the present disclosure. As shown in Figure 2, in addition to the control system shown in Figure 1, the system further includes a plurality of energy storage converter controllers EMU 50.

[0034] Here, an energy storage converter controller EMU50 is installed in each energy storage subsystem, and a first end of each energy storage converter controller EMU50 is connected to a second end of a corresponding battery master controller unit BAMS20, and a second end of each energy storage converter controller EMU50 is connected to a first end of a corresponding plurality of energy storage converters 30, i.e., a first end of the energy storage converter controller EMU50 is connected to a second end of the BAMS controller 20 in the energy storage system where it is located, and a second end is connected to a first end of each energy storage converter 30 in the energy storage subsystem where it is located.

[0035] In this embodiment, the energy storage converter controller EMU30 performs modular independent control of the multiple energy storage converter modules AC / DC1 to AC / DCn connected thereto, thereby ensuring the power response speed of the system. Furthermore, when the BAMS controller 20 is connected to the energy storage converter controller EMU50, it transmits control commands for the corresponding energy storage converter modules 30 to the energy storage converter controller EMU30, and modular independent control can be performed for each corresponding energy storage converter 30 (within the energy storage subsystem) through the energy storage converter controller EMU50.

[0036] In one embodiment of the present disclosure, when performing power equalization adjustment, the BAMS controller 20 distributes power equally based on the health state and maximum charge / discharge capacity of each battery cluster BCMS1 to BCMSn, thereby realizing power equalization adjustment of the multi-branch battery system and SOC control between the battery clusters.

[0037] In one possible implementation, the power equalization adjustment by the BAMS controller 20 can be divided into two aspects: equalizing power and equalizing power. That is, the equalizing power strategy of the present disclosure is to first equalize 60% of the total power, and then equalize 40% of the total power, thereby ensuring that the equalized power of each energy storage unit does not exceed the maximum power of the energy storage unit itself, and improving the practicality and reliability of the power equalization adjustment.

[0038] In this embodiment, the BAMS controller 20 performs different operations depending on the operating state of each battery cluster in the energy storage subsystem where it is located and whether the residual charge SOC between each branch is equalized. In specific implementation, the battery master controller unit BAMS is specifically used in the following cases: When each battery cluster in the energy storage subsystem where the BAMS controller 20 is located operates normally and the residual charge SOC of each branch is equalized, the power of each energy storage unit is calculated by the following formula: JPEG0007795852000006.jpg11150 where p (i) is the power of the i-th energy storage unit, p z is the total power of the zth energy storage subsystem, n is the number of energy storage units in the zth energy storage subsystem, and i and z are positive integers. z may be any energy storage subsystem within the energy storage system, where z is understood to be less than or equal to the number of energy storage subsystems included in the AC-side parallel energy storage system, and i is understood to be less than or equal to the number of energy storage units included in the energy storage subsystem.

[0039] If any number of battery clusters in the energy storage subsystem in which the BAMS controller 20 is located fail and the residual charge SOC of each remaining branch is equalized, the power of each energy storage unit is calculated using the following formula:

number

[0040] If the residual charge SOC between the battery clusters in the energy storage subsystem where the BAMS controller 20 is located is not equalized, the power of each energy storage unit is calculated using the following formula:

number

[0041] Furthermore, in the third scene, when calculating the weights of the energy storage units, the BAMS controller 20 specifically calculates the weights of each energy storage unit by the following equation:

number

[0042] The weight calculation method for the energy storage unit in the embodiment of the present disclosure can be easily understood by referring to the schematic diagram of the weight calculation principle shown in Figure 3. The present disclosure first obtains the residual charge SOC value of each energy storage unit in the energy storage subsystem, then sorts each SOC value according to its magnitude, and determines the maximum, minimum, lower quartile, median, and upper quartile of the SOC value of each energy storage unit. Here, quartiles, also known as quartile points, refer to the values ​​located at the three divisions when all values ​​are sorted in ascending order and divided into four equal parts. Furthermore, the residual charge SOC value of the energy storage unit to be calculated is compared with the determined values ​​to determine the section in which the current energy storage unit is located, and the weight of the current energy storage unit is calculated based on the calculation method shown in the above formula. In the figure, w i is the weight of the i-th energy storage unit in the above equation.

[0043] As described above, the multi-branch battery system control system of the embodiment of the present disclosure monitors and compiles statistics on the data of the corresponding battery clusters BCMS1 to BCMSn in real time through each BAMS controller 20. If one or more battery clusters among BCMS1 to BCMSn fail, the BAMS controller 20 can immediately isolate the failed battery cluster based on the system redundancy control strategy of the embodiment to ensure the normal operation of the other battery clusters. Furthermore, after implementing the redundancy control strategy, the BAMS controller 20 performs energy equalization and distribution to the other battery clusters based on the power equalization adjustment method of the embodiment, ensuring stable system power output and improving the stability of the system's power support.

[0044] Furthermore, in one embodiment of the present disclosure, if one or more battery clusters among the battery clusters BCMS1 to BCMSn fail and the maximum charging / discharging capacity of the system cannot meet the rated output power of the system, it is determined that the effective power of the subsystem is 0.

[0045] In one embodiment of the present disclosure, the energy storage units of each energy storage subsystem are expandable, and the number of energy storage units included in each energy storage subsystem may be equal or unequal, and each energy storage subsystem may support multiple types of battery clusters to form a mixed energy storage system. The battery master controller unit BAMS20 is also used to monitor data of corresponding different types of battery clusters and independently control each corresponding battery cluster. That is, the energy storage units of each energy storage subsystem are expandable, and the number of energy storage units is not necessarily equal, and each energy storage subsystem may support multiple types of battery clusters to form a mixed energy storage system, and any BAMS controller 20 can monitor data of different types of BCMSs within the energy storage analysis located therein and independently control different types of battery clusters BCMS1 to BCMSn.

[0046] As described above, the control system for a multi-branch battery system according to the embodiment of the present disclosure can achieve power equalization and regulation of the multi-branch battery system and equalization and control of the residual charge SOC between each battery cluster. In the event of a failure in the multi-branch battery system, the system can be controlled redundantly to immediately disconnect the failed battery cluster, ensuring the normal operation of the remaining battery clusters. After disconnection, the system can perform energy equalization and distribution among the remaining battery clusters, ensuring the stability of the system output power. Therefore, the system can achieve power equalization and redundancy control of the multi-branch battery system and improve the stability of the system's power support.

[0047] Based on the above embodiment, in order to more clearly explain the operation process of the control system for the multi-branch battery system of the present disclosure, a control method applied to the multi-branch battery system will also be described below. It should be noted that the control method for the multi-branch battery system is realized based on the control system for the multi-branch battery system described above.

[0048] As shown in FIG. 4, the control method for the multi-branch battery system includes steps S401 to S403.

[0049] Step S401: monitor the data of the energy storage subsystems in real time through the energy management system EMS controller, and send a first equalization distribution scheduling command to the corresponding battery master controller unit BAMS according to the maximum charge / discharge capacity of each energy storage subsystem.

[0050] Step S402: Monitor the data of each energy storage system in real time through the battery master controller unit BAMS, and upload the monitored data to the energy management system EMS controller.

[0051] Step S403: When any number of energy storage units fail, redundant control of the failed energy storage units is performed through the battery master controller unit BAMS, and power equalization adjustment is performed based on the detected maximum charge / discharge capacity of each energy storage unit, thereby realizing equalization control of residual charge SOC between battery clusters.

[0052] Based on the above-described control method for a multi-branch battery system, in order to more clearly explain the process of achieving power equalization adjustment in the multi-branch battery system disclosed herein, a specific control method for a multi-branch battery system will be described below. As shown in Figure 5, the method includes steps S501 to S505.

[0053] Step S501: Count the number of failed battery clusters.

[0054] In this step, the number k of failures of all battery clusters BCMS1 to BCMSn in the current energy storage subsystem is counted, where k is equal to or greater than 0.

[0055] Step S502: Redundancy control of the branch failure system is performed.

[0056] Step S503: Determine whether the remaining energy storage units in normal state are equalized; if yes, execute step S504; if no, execute step S505.

[0057] Step S504: Control the equalized power distribution of the energy storage units in the normal state, where the equalized power of each energy storage unit in the normal state is less than or equal to the maximum power of a single energy storage unit.

[0058] Step S505: Control the equalized power of the energy storage units in a normal state, where the equalized power of each energy storage unit in a normal state is less than or equal to the maximum power of a single energy storage unit.

[0059] It should be noted that the description of the control system embodiment of the multi-branch battery system above also applies to the method of this embodiment, and the realization principle is similar, so no further description is given here.

[0060] As described above, the control method for a multi-branch battery system according to the embodiment of the present disclosure can achieve power equalization and control of the multi-branch battery system and equalization and control of the residual charge SOC between each battery cluster. In the event of a failure in the multi-branch battery system, the system performs redundant control to immediately disconnect the failed battery cluster, ensuring the normal operation of the remaining battery clusters. After disconnection, the remaining battery clusters are subjected to energy equalization and distribution, ensuring the stability of the system output power. Therefore, the system can achieve power equalization and redundant control for the multi-branch battery system and improve the stability of the system's power support.

[0061] To realize the above embodiment, the embodiment of the present invention further provides electronic equipment, as shown in Figure 6, which is a schematic diagram of the structure of the electronic equipment provided by the embodiment of the present disclosure.

[0062] As shown in FIG. 6 , the electronic device 1000 may include the control system 2000 for the multi-branch battery system described in the above embodiment, or the electronic device 1000 of the embodiment of the present disclosure. The control system 2000 for the multi-branch battery system can adjust the output power of the AC-side parallel energy storage system and realize power equalization adjustment and redundancy control of the AC bus battery system.

[0063] In describing the present invention, the terms "first" and "second" are used for descriptive purposes and are not to be understood as indicating or implying relative importance. Also, in describing the present disclosure, "plurality" means two or more, unless otherwise specified.

[0064] Any process or method illustrations depicted in flow charts or otherwise described herein represent modules, segments, or portions of code of one or more executable instructions that comprise steps for implementing specific logical functions or processes, and those skilled in the art to which embodiments of the present disclosure pertain will understand that the scope of preferred embodiments of the present disclosure may be implemented in sequences other than those shown or discussed, including performing functions essentially simultaneously or in reverse order based on the functions involved.

[0065] In the description herein, references to "one embodiment," "some embodiments," "examples," "particular examples," or "some examples" mean that the 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 the description herein, general references to the above terms do not necessarily refer 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.

[0066] Although the embodiments of the present disclosure have been shown and described above, the above embodiments are illustrative and do not limit the present disclosure. Those skilled in the art may change, modify, substitute, and alter the above embodiments within the scope of the present disclosure.

Claims

1. 1. A control system for a multi-branch battery system, comprising: Energy management system EMS controller, a plurality of battery master controller units BAMS; multiple energy storage converters, a plurality of battery cluster controllers BCMS; Each of the battery cluster controllers BCMS is connected to a corresponding battery cluster; Each battery cluster is further connected to a corresponding one of the energy storage converters to form an energy storage unit, wherein: The energy management system EMS controller is used for monitoring data of energy storage subsystems in real time, and sending a first equalization distribution scheduling command to the corresponding battery master controller unit BAMS according to the maximum charge / discharge capacity of each of the energy storage subsystems; A first end of each of the battery master controller units BAMS is connected to the energy management system EMS controller, and a second end of each of the battery master controller units BAMS is connected to first ends of a corresponding plurality of the energy storage converters, and the battery master controller unit BAMS is used to monitor data of each of the corresponding energy storage units in real time and upload the monitored data to the energy management system EMS controller; When any number of energy storage units among all the corresponding energy storage units fail, the battery master controller unit BAMS is also used to perform redundant control of the failed energy storage units, and perform equalization adjustment of power based on the detected maximum charge / discharge capacity of each of the energy storage units, thereby realizing equalization control of residual charge SOC between battery clusters; The control system of the multi-branch battery system further includes: a plurality of energy storage converter controllers EMU, a first end of each of the energy storage converter controllers EMU being connected to a second end of a corresponding one of the battery master controller units BAMS; a second terminal of each of the energy storage converter controllers EMU is connected to a first terminal of a corresponding one of the plurality of energy storage converters; The battery master controller unit BAMS is also used to perform modular independent control for each of the corresponding energy storage converters through the energy storage converter controller EMU.

2. The control system according to claim 1 , wherein all energy storage units corresponding to one battery master controller unit BAMS constitute one energy storage subsystem.

3. The energy management system EMS controller receives a second equalization distribution scheduling command sent from an external monitoring system; and 2. The control system according to claim 1, further used to send the second equalization distribution scheduling command to the corresponding battery master controller unit BAMS.

4. The control system according to claim 3 , wherein the battery master controller unit BAMS is also used to perform the power equalization adjustment based on the received first equalization distribution scheduling command and / or the received second equalization distribution scheduling command.

5. Specifically, when each battery cluster in the energy storage subsystem where the BAMS is located operates normally and the residual charge SOC of each branch is equalized, the battery master controller unit BAMS uses the following formula to calculate the power of each energy storage unit: [Equation 1] where p (i) is the power of the i-th energy storage unit, p z is the total power of the zth energy storage subsystem, n is the number of energy storage units included in the zth energy storage subsystem, and i and z are positive integers; When any number of the battery clusters in the energy storage subsystem in which it is located fail and the residual charge SOC of each remaining branch is equalized, the power of each of the energy storage units is calculated by the following formula: [Equation 2] where p (i) is the power of the i-th energy storage unit, p z is the total power of the zth energy storage subsystem, n is the number of energy storage units contained in the zth energy storage subsystem, k is the number of failed battery clusters, and i, z, and k are positive integers; If the residual charge SOC between each of the battery clusters in the energy storage subsystem is not equalized, calculate the power of each of the energy storage units using the following formula: [Equation 3] where: 【number】 and where p (i) is the power of the i-th energy storage unit, p z is the total power of the zth energy storage subsystem, n is the number of energy storage units in the zth energy storage subsystem, k is the number of failed battery clusters, and w i The control system of claim 1 , wherein: is the weight of the i-th energy storage unit.

6. Specifically, the battery master controller unit BAMS calculates the weight of the energy storage unit by the following formula: [Equation 4] where w i is the weight of the i-th energy storage unit, n is the number of energy storage units included in the z-th energy storage subsystem, and SOC i is the residual charge SOC value of the energy storage unit, SOC Q1 is the lower quartile of the residual charge SOC value of each energy storage unit in the energy storage system, SOC Q2 is the median of the residual charge SOC value of each energy storage unit in the energy storage system, SOC Q3 6. The control system of claim 5, wherein i, z, and n are positive integers, and n is an upper quartile of the residual charge SOC value of each energy storage unit in the energy storage system.

7. 2. The control system of claim 1, wherein the energy storage units of each of the energy storage subsystems are expandable, and the number of energy storage units included in each of the energy storage subsystems is equal or unequal, and each of the energy storage subsystems is capable of supporting multiple types of battery clusters to form a mixed energy storage system, and the battery master controller unit BAMS is also used to monitor data of corresponding different types of battery clusters and exercise independent control over each corresponding battery cluster.

8. An electronic device comprising the control system for the multi-branch battery system according to any one of claims 1 to 7.

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