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 in particular to a control system and method for a multi-branch battery system. Cross-references to related applications This application is filed based on a Chinese patent application bearing application number 202210940362.3 and filing date August 5, 2022, and claims priority to said Chinese patent application, the entire contents of which are incorporated herein by reference. [Background technology]

[0002] With the development of new energy technology, 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 it is an important component and key technology in systems such as smart power grids, renewable energy systems and energy internet. At present, it is used in peak adjustment, frequency adjustment, or cascading use of batteries in energy storage power plants, emergency power supply and peak shaving.

[0003] In the related art, battery clusters are generally paralleled and directly connected to a process control system (PCS), which has high requirements for battery consistency. When a battery mismatch or module failure occurs after a period of operation, mismatch will also occur between the battery clusters, causing the PCS system to operate at a lower power as a low-power battery cluster, which will affect 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 use the multi-branch integration method of AC bus to realize decoupling and segmented management between battery clusters, avoiding the impact of battery mismatch caused by direct parallel connection.

[0004] However, in a multi-branch battery system, there are many battery types and the batteries have different decay characteristics, so the capacity of each branch is also different, which may affect the stability of the output power of the energy storage system. That is, the multi-branch battery system in the related art has many battery types, low consistency, difficult state evaluation, high safety risks, etc., which result in the problem that the output power of the energy storage system is unstable. 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 said battery cluster controllers BCMS is connected to a corresponding battery cluster, and each battery cluster is further connected to a corresponding said energy storage converter to form an energy storage unit, wherein: The energy management system EMS controller is used for monitoring data of the 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 charging and discharging 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 corresponding ones of the plurality of energy storage converters, and the battery master controller unit BAMS is used for monitoring data of each of the corresponding energy storage units in real time and uploading the monitored data to the energy management system EMS controller; The battery master controller unit BAMS is also used for performing redundant control of the failed energy storage units when any number of the corresponding energy storage units fail, and performing equalization adjustment of power according to the maximum charge / discharge capacity of each of the detected energy storage units, to realize 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 one of the energy storage converters through the energy storage converter controller EMU.

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

number

number

number

[0011] In some embodiments, the battery master controller unit BAMS is specifically used to calculate the weight of the energy storage unit according to the following formula: JPEG2025511502000006.jpg40148 Here, 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 th 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, where i and n are positive integers.

[0012] In some embodiments, the energy storage units of each of the energy storage subsystems can support expansion, 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 according to a 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 charging and discharging capacity of each of the energy storage units, thereby realizing equalization control of the residual charge SOC between the battery clusters.

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

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

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

[0017] Hereinafter, the embodiments of the present disclosure will be described in detail. The embodiments are illustrated in the drawings for illustrative purposes, 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 structure of a control system for a multi-branch battery system proposed in an embodiment of the present disclosure. As shown in FIG. 1, the system includes an Energy Management System (EMS) controller 10, a number of Battery Master Controller Units (BAMS) 20, a number of Energy Storage Converters 30 and a number of Battery Cluster Controllers (BCMS) 40.

[0020] Here, each battery cluster controller BCMS 40 is connected to a corresponding battery cluster, that is, for each battery cluster in the energy storage system, one corresponding battery cluster controller is installed as a slave controller of the battery cluster, and the battery cluster controller is fixedly corresponding to one battery cluster, so that in the following description of the present disclosure, the battery cluster can be represented by BCMS. The energy storage converter corresponding to the battery cluster is the energy storage converter in the same branch as the current battery cluster, and as can be seen from FIG. 1, the energy storage converter and the battery cluster of the present disclosure are multi-branch topology structures, and each battery cluster is also connected to the 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 for distinguishing the battery master controller unit, the energy storage converter and the battery cluster controller in different energy storage systems.

[0021] In some embodiments, an 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 a corresponding battery master controller unit BAMS 20 (hereinafter referred to as BAMS controller 20) based on the maximum charging and discharging 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 constitute 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 constitute one energy storage subsystem, that is, all energy storage units currently connected to the BAMS controller 20 are used as the energy storage subsystem currently corresponding to the 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 charging / discharging capacity of the energy storage subsystem, and the corresponding battery master controller unit BAMS20 is, i.e., 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 the second equalization distribution scheduling command sent from the 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 state of the multi-branch battery system in real time, and when one or more battery clusters fail, the equalization distribution scheduling command is calculated through logic functions such as data statistics of the external monitoring system and sent to the EMS controller 10, and then the EMS controller 10 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 first ends of a corresponding plurality of energy storage converters 30, and the battery master controller unit BAMS20 is used to monitor 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 of each energy storage unit in real time and upload it to the EMS controller 10, so that the EMS controller 10 collects data of each energy storage unit in each energy storage subsystem to realize real-time monitoring of data of each energy storage subsystem. The data of each energy storage unit may be an operating parameter such as the output power of the energy storage unit, and the operating state of each energy storage unit can be determined based on the magnitude of the monitored data. For example, if it is detected that the output power of a certain energy storage unit is zero, it can be determined that the battery cluster in the energy storage unit is faulty.

[0027] The battery master controller unit BAMS20 is also used to perform redundant control of the failed energy storage units when any number of the corresponding energy storage units fail, and perform power equalization adjustment based on the maximum charge / discharge capacity of each detected energy storage unit, thereby realizing equalization control of the residual charge SOC between the battery clusters.

[0028] Here, all the corresponding energy storage units refer to the respective energy storage units included in the energy storage subsystem currently corresponding to the BAMS controller 20. The arbitrary number means that the number of energy storage units in which a failure occurs 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 power response speed of the system. Single-branch modular control means that the BAMS controller 20 has a coordinated control capability, and when the energy storage units of one or more clusters fail, the BAMS controller 20 executes a redundancy control strategy for the failed branch alone, disconnects the failed battery cluster in a timely manner, ensures the normal operation of other battery clusters, and enhances the stability of the power support of the system. After executing the redundancy control strategy, the BAMS controller 20 performs an equalized distribution of energy for the remaining normally operating battery clusters, specifically, performs power equalization adjustment based on the maximum charging and discharging power of each detected energy storage unit, realizes equalized control of the residual charge SOC between the battery clusters, and ensures the stable power output of the system.

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

[0031] As can be seen from the above description, the control system of 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 judgment based on the monitored data of 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 the equalization distribution scheduling command sent from the external monitoring system and sends it to the BAMS controller 20; when the BAMS controller 20 judges that an energy storage unit has failed based on the monitored data of each energy storage unit, it performs redundancy control for the failed energy storage unit, and performs power equalization adjustment based on the maximum charge / discharge capacity of each detected energy storage unit. When a battery cluster fails, the EMS controller 10 and the external monitoring system simultaneously detect the failure of the battery cluster and send a power equalization distribution scheduling command, and the BAMS controller 20 may simultaneously receive the first equalization distribution scheduling command and the second equalization distribution scheduling command, or may receive the first equalization distribution scheduling command or the second equalization distribution scheduling command alone. It is understood that the BAMS controller 20 is thus capable of receiving a first equalization distribution scheduling command and / or a second equalization distribution scheduling command, and performing power equalization adjustments in some scenes when it is self-detected that power equalization distribution scheduling needs to be performed.

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

[0033] In order 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 presented by an embodiment of the present disclosure, and 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., the first end of the energy storage converter controller EMU50 is connected to the second end of the BAMS controller 20 in the energy storage system in which it is located, and the second end is connected to the first end of each energy storage converter 30 in the energy storage subsystem in which it is located.

[0035] In this embodiment, the energy storage converter controller EMU30 performs modularized independent control on the multiple energy storage converter modules AC / DC1 to AC / DCn connected thereto, and can guarantee the power response speed of the system. Furthermore, when the BAMS controller 20 is connected to the energy storage converter controller EMU50, it transmits a control command for the corresponding energy storage converter module 30 to the energy storage converter controller EMU30, and can perform modularized independent control on each corresponding energy storage converter 30 (in the energy storage subsystem) through the energy storage converter controller EMU50.

[0036] In one embodiment of the present disclosure, when the BAMS controller 20 performs power equalization adjustment, it 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] As one possible implementation, the power equalization adjustment by the BAMS controller 20 can be divided into two aspects: equal distribution power and equalization power, that is, the equalization 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 practicability and reliability of the power equalization adjustment.

[0038] In this embodiment, the BAMS controller 20 performs different operations according to the working state of each battery cluster in the energy storage subsystem in which it is located and whether the residual charge SOC between each branch is equalized. When specifically implemented, the battery master controller unit BAMS is specifically used in the following cases: When each battery cluster in the energy storage subsystem in which 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: JPEG2025511502000007.jpg11150 Here, 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 by the following formula:

number

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

number

[0041] Furthermore, in the above third scene, when the BAMS controller 20 calculates the weight of the energy storage unit, the BAMS controller 20 specifically calculates the weight of each energy storage unit by the following formula:

number

[0042] The weight calculation method of 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 FIG. 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, the quartile is also called the quartile point, and refers to the value 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 each of 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, i is the weight of the i-th energy storage unit in the above equation.

[0043] As described above, the control system of the multi-branch battery system of the embodiment of the present disclosure monitors and stats the data of the corresponding battery clusters BCMS1 to BCMSn in real time through each BAMS controller 20, and when one or more battery clusters of the battery clusters BCMS1 to BCMSn fail, the BAMS controller 20 can immediately isolate the failed battery cluster based on the system redundancy control strategy of the above 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 distribution to the other battery clusters based on the power equalization adjustment method of the embodiment, to ensure the stable output of the system power and improve the stability of the system power support.

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

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

[0046] As described above, the control system of the multi-branch battery system of the embodiment of the present disclosure can realize the power equalization adjustment of the multi-branch battery system and the equalization control of the residual charge SOC between each battery cluster, and when the multi-branch battery system fails, it performs redundant control of the system to immediately isolate the failed battery cluster to ensure the normal operation of the other battery clusters, and after isolation, performs energy equalization distribution for the remaining battery clusters to ensure the stability of the system output power. Therefore, the system can realize the power equalization adjustment and redundant control of the multi-branch battery system and improve the stability of the power support of the system.

[0047] Based on the above embodiment, in order to more clearly explain the operating 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 above-mentioned control system for the multi-branch battery system.

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

[0049] Step S401, monitor data of 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 according to the maximum charge / discharge capacity of each energy storage subsystem.

[0050] Step S402, monitor 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, perform redundant control of the failed energy storage units through the battery master controller unit BAMS, and perform power equalization adjustment according to the maximum charge / discharge capacity of each detected energy storage unit, thereby realizing equalization control of residual charge SOC between battery clusters.

[0052] Based on the above-mentioned control method of the multi-branch battery system, in order to more clearly explain the process of realizing the power equalization adjustment of the multi-branch battery system of the present disclosure, a specific control method of the 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 greater than or equal to 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 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 above description of the control system embodiment of the multi-branch battery system also applies to the method of this embodiment, and the realization principle is similar, so no further description will be given here.

[0060] As described above, the control method of the multi-branch battery system of the embodiment of the present disclosure can realize the power equalization adjustment of the multi-branch battery system and the equalization control of the residual charge SOC between each battery cluster, and when the multi-branch battery system fails, the system performs redundancy control to immediately isolate the failed battery cluster to ensure the normal operation of the other battery clusters, and after isolation, performs energy equalization distribution for the remaining battery clusters to ensure the stability of the system output power. Therefore, the system can realize the power equalization adjustment and redundancy control of the multi-branch battery system and improve the stability of the power support of the system.

[0061] To realize the above embodiment, the embodiment of the present disclosure further provides an electronic device. Figure 6 is a schematic diagram of the structure of the electronic device provided by the embodiment of the present disclosure.

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

[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 depict modules, segments or portions of code of one or more executable instructions that comprise steps for implementing particular logical functions or processes, and it will be understood by those skilled in the art to which the embodiments of the present disclosure pertain that the scope of the preferred embodiments of the present disclosure may be implemented in other sequences 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 disclosure. In the present description, general references to the above terms do not necessarily refer to the same embodiment or example. Moreover, 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 change the above embodiments within the scope of the present disclosure.

Claims

1. A control system for a multi-branch battery system, comprising: Energy management system EMS controller, A plurality of battery master controller units BAMS; A plurality of 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 charging and discharging 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 corresponding multiple energy storage converters, and the battery master controller unit BAMS is used for monitoring data of each of the corresponding energy storage units in real time and uploading the monitored data to the energy management system EMS controller; The battery master controller unit BAMS is also used for performing redundant control of the failed energy storage units when any number of the corresponding energy storage units fail, and performing equalization adjustment of power based on the maximum charge / discharge capacity of each of the detected energy storage units, thereby realizing equalization control of residual charge SOC between battery clusters; The control system for the multi-branch battery system, wherein 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.

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

3. The energy management system EMS controller receives a second equalization distribution scheduling command sent from an external monitoring system; and The control system according to claim 1 , further used for sending 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 second equalization distribution scheduling command.

5. It 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 end of each of the energy storage converter controllers EMU is connected to first ends of a corresponding one of the energy storage converters; 2. The control system according to claim 1, wherein the battery master controller unit BAMS is also used to provide modular independent control to each of the corresponding energy storage converters through the energy storage converter controller EMU.

6. Specifically, when each battery cluster in the energy storage subsystem in which the battery master controller unit 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: [0010] Here, 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, i and z are positive integers, When any number of the battery clusters in the energy storage subsystem in which they are 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: [0025] Here, 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 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, the power of each of the energy storage units is calculated by the following formula: [0030] Where: 【number】 and Here, 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:

7. Specifically, the battery master controller unit BAMS calculates the weight of the energy storage unit according to the following formula: [0045] Here, w i is the weight of the i-th energy storage unit, n is the number of energy storage units in the z-th energy storage subsystem, and SOC i is the residual charge SOC value of the th 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 7. The control system of claim 6, 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.

8. 2. The control system of claim 1, wherein the energy storage units of each of the energy storage subsystems can support expansion, 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 can support multiple types of battery clusters to configure 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 on each corresponding battery cluster.

9. A method for controlling a multi-branch battery system, comprising: 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 according to a 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; The control method for the multi-branch battery system, when any number of energy storage units fail, performs redundant control of the failed energy storage units through the battery master controller unit BAMS, performs power equalization adjustment based on the detected maximum charge / discharge capacity of each of the energy storage units, and realizes equalization control of residual charge SOC between battery clusters.

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

Images