Control method, device and system of energy storage system

Abstract

The invention discloses a control method, device and system of an energy storage system, the energy storage system comprises a plurality of battery clusters connected in parallel, each battery cluster comprises a cluster battery management module, a current limiting module and at least one battery module, and the current limiting module is used for keeping the current of the battery module within a preset range; the control method comprises the following steps: acquiring current data corresponding to each battery module; determining current information of the corresponding battery cluster according to the current data; according to the current information and the preset current information, the corresponding current limiting module is controlled to be turned on or turned off. According to the control method provided by the invention, circulation control can be completed, the capacity difference between the battery clusters is balanced, and the reliability and energy utilization rate of the system are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery control technology, and in particular to a control method, device and system for an energy storage system. Background Art

[0002] The development of energy directly affects the development of social production. Various energy technologies such as wind power generation, solar power generation and hydropower generation have become the main energy technologies for social development. When a large amount of unstable new energy generation is integrated into the power grid, it will bring unbearable pressure to the power grid. In order to maintain the balance of "source follows load" in the power grid, the role of multi-battery cluster DC coupled energy storage, i.e. large-scale energy storage, becomes extremely important; large-scale energy storage technology plays an important role in smoothing intermittent power fluctuations, reducing load peak-to-valley differences, and improving the safety, stability and power supply quality of the power grid.

[0003] From the current development of electrochemical energy storage technology: with the development of high-rate batteries, they can be more widely used in situations that require a large amount of energy in a short period of time; with the research on low-temperature battery technology, the application range of batteries has become wider; coupled with the development of low-cost and high-efficiency waste battery recycling technology, it will promote the further development of electrochemical energy storage.

[0004] With the development of highly integrated energy storage technology, the capacity of a single cabinet has grown from 1MWh to 5MWh. The increase in capacity requires not only an increase in the number of single battery strings, but also an increase in the capacity of single batteries. The number of battery clusters in the energy storage system has developed to N (N=15) clusters of DC coupling; since the number of battery strings in a cluster ranges from 200 to 400, the differences between lithium battery clusters have greatly increased; in order to improve system reliability and safety, the system needs to be able to start normally even when there are current differences between clusters, and the current size of each cluster can be controlled not to exceed the system design threshold.

[0005] The current between each coupled cluster is too large. The fundamental reason is that there are too many battery strings and the system itself. Once the difference occurs and is not handled, the actual capacity difference between clusters will become larger and larger. The system will be reflected in the problems of inconsistent voltage, excessive circulating current and inconsistent temperature rise, causing the system to fail to operate normally, and even worse, causing serious failures. Summary of the invention

[0006] The present invention provides a control method, device and system for an energy storage system. By adding a current limiting module to each battery cluster in the energy storage system, the capacity balance of the entire energy storage system is achieved by controlling the current limiting module, thereby preventing the problem of excessive circulating current during startup and improving the stability and working efficiency of the entire energy storage system.

[0007] According to a first aspect of the present invention, a control method for an energy storage system is provided, wherein the energy storage system comprises a plurality of battery clusters connected in parallel, each of the battery clusters comprises a cluster battery management module, a current limiting module and at least one battery module, the current limiting module being used to keep the current of the battery module within a preset range, the control method comprising:

[0008] Acquiring current data corresponding to each of the battery modules;

[0009] Determining current information corresponding to the battery cluster according to the current data;

[0010] The corresponding current limiting module is controlled to be turned on or off according to the current information and the preset current information.

[0011] Optionally, controlling the opening or closing of the corresponding current limiting module according to the current information and the preset current information includes:

[0012] When the current information is greater than or equal to the preset current information, the cluster battery management module controls the corresponding current limiting module to keep the current in the battery cluster at a preset current value;

[0013] When the current information is less than the preset current information, the cluster battery management module controls the corresponding current limiting module to enter a standby state.

[0014] Optionally, when the current information is less than the preset current information, the cluster battery management module controls the corresponding current limiting module to enter a standby state, including:

[0015] Continuously monitoring the current information;

[0016] When the current information is less than or equal to a first threshold current, the cluster battery management module controls the corresponding current limiting module to be turned off.

[0017] Optionally, before acquiring the current data corresponding to the battery module, the method further includes:

[0018] Obtaining the working status of the battery module;

[0019] The opening or closing of the DC switch in the corresponding battery cluster is controlled according to the working state.

[0020] Optionally, obtaining the working status of the battery module includes:

[0021] detecting a state of charge of the battery module;

[0022] A charge and discharge state of the battery cluster is determined according to the state of charge.

[0023] Optionally, controlling the opening or closing of a DC switch in the battery cluster according to the working state includes:

[0024] When the working state is in charging or discharging, controlling the DC switch of the corresponding battery cluster to close;

[0025] When the working state is in the state of charging completion or discharging completion, the DC switch of the corresponding battery cluster is controlled to be disconnected.

[0026] Optionally, when the DC switches of the battery cluster are all in the disconnected state, after obtaining the power-on instruction of the energy storage system, the current data corresponding to each of the battery modules is obtained; the current information corresponding to the battery cluster is determined according to the current data; and the corresponding current limiting module is controlled to be turned on or off according to the current information and preset current information.

[0027] According to a second aspect of the present invention, a control device for an energy storage system is provided, wherein the energy storage system comprises a plurality of battery clusters connected in parallel, each of the battery clusters comprises a cluster battery management module, a current limiting module and at least one battery module, wherein the current limiting module is used to keep the current of the battery module within a preset range, and the control device comprises:

[0028] An acquisition module, used for acquiring current data corresponding to each of the battery modules;

[0029] A current information determination module, used to determine the current information corresponding to the battery cluster according to the current data;

[0030] A control module is used to control the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

[0031] Optionally, the control device further includes a display module;

[0032] The display module is used to display the current data and the current information.

[0033] According to a third aspect of the present invention, a control system for an energy storage system is provided, comprising an inverter, a battery array management system and the control device for the energy storage system described in the second aspect; the inverter and the battery array management system are connected via a bus.

[0034] The present invention discloses a control method, device and system for an energy storage system. The energy storage system includes a plurality of battery clusters connected in parallel. Each battery cluster includes a cluster battery management module, a current limiting module and at least one battery module. The current limiting module is used to keep the current of the battery module within a preset range. The control method includes: obtaining current data corresponding to each battery module; determining the current information of the corresponding battery cluster according to the current data; and controlling the opening or closing of the corresponding current limiting module according to the current information and the preset current information. The control method for the energy storage system provided by the present invention realizes the capacity balance of the entire energy storage system by adding a current limiting module to each battery cluster in the energy storage system and controlling the current limiting module, thereby preventing the problem of excessive circulating current at startup and improving the stability and working efficiency of the entire energy storage system.

[0035] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a block diagram of a control device for an energy storage system provided by an embodiment of the present invention;

[0038] Figure 2 is a flow chart of a control method for an energy storage system provided by an embodiment of the present invention;

[0039] Figure 3 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention;

[0040] Figure 4 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention;

[0041] Figure 5 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention;

[0042] Figure 6 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention;

[0043] Figure 7 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention;

[0044] Figure 8 is a schematic diagram of a control device for an energy storage system provided by an embodiment of the present invention;

[0045] Fig. 9 It is a schematic diagram of a control device of another energy storage system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0049] Figure 1 is a block diagram of a control device for an energy storage system provided by an embodiment of the present invention. Figure 2 This is a flow chart of a control method for an energy storage system provided by an embodiment of the present invention, combined with Figure 1 and Figure 2 An embodiment of the present invention provides a control method for an energy storage system, wherein the energy storage system includes a plurality of battery clusters 1 connected in parallel, each battery cluster 1 including a cluster battery management module 11, a current limiting module 12 and at least one battery module 13, and the current limiting module 12 is used to keep the current of the battery module 13 within a preset range.

[0050] The energy storage system is a system that can store and release electric energy, including L battery clusters 1, L is at least 2 clusters, each battery cluster 1 includes a cluster battery management module 11, the cluster battery management module 11 is used to monitor and manage all battery modules 13 in the battery cluster, wherein the number of battery modules 13 is N, N is at least 2, the current limiting module 12 can be a constant current limiting circuit (Constant Current Limiting Circuit, CCLC), CCLC can maintain the output current of the battery module 13 at a constant maximum value by controlling when the load exceeds a certain level, so as to avoid the problem of excessive circulating current or excessive current caused at the power-on moment and the end of charging and discharging of the energy storage system.

[0051] The control method provided by the embodiment of the present invention includes:

[0052] S1. Obtain current data corresponding to each battery module 13.

[0053] Specifically, when the cluster battery management module 11 receives a power-on instruction from the user, it can be understood that the power-on instruction includes but is not limited to: starting charging, starting discharging or stopping charging, etc. Since the energy storage system may have a problem of excessive circulating current at the moment of powering on, when the energy storage system starts to power on, the cluster battery management module 11 turns on the current limiting module 12, and at the same time, the current limiting module 12 obtains the current data corresponding to each battery module 13.

[0054] S2. Determine the current information of the corresponding battery cluster 1 according to the current data.

[0055] Specifically, the entire current information of the battery cluster 1 where the battery module 13 is located is determined according to the current data of all battery modules 13 obtained in the above step S1. It can be understood that each battery cluster 1 corresponds to at least one battery module 13, and the current data of the battery module 13 obtained corresponds to the current information of the battery cluster 1 where the battery module 13 is located.

[0056] S3. Control the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

[0057] The preset current information may be set in advance by the user according to demand. For example, the embodiment of the present invention is described by taking 50A as an example.

[0058] Specifically, the cluster battery management module 11 compares and analyzes the current information determined in the above step S2 with the preset current information to control the opening or closing of the current limiting module 12 .

[0059] The energy storage system control method provided in the embodiment of the present invention achieves capacity balance of the entire energy storage system by adding current limiting modules to each battery cluster in the energy storage system and controlling the current limiting modules, thereby preventing the problem of excessive circulating current during startup and improving the stability and working efficiency of the entire energy storage system.

[0060] On the basis of the above-mentioned embodiment, this embodiment further refines the control of opening or closing of the corresponding current limiting module according to the current information and the preset current information. Figure 3 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention, refer to Figure 3 , the control method of the embodiment of the present invention includes:

[0061] S21. Obtain current data corresponding to each battery module.

[0062] S22. Determine current information of the corresponding battery cluster according to the current data.

[0063] S23. Control the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

[0064] S24. Analyze and compare the current information with the preset current information.

[0065] When the current information is greater than or equal to the preset current information, step S2401 is executed; when the current information is less than the preset current information, step S2402 is executed.

[0066] S2401: When the current information is greater than or equal to the preset current information, the cluster battery management module controls the corresponding current limiting module to keep the current in the battery cluster at the preset current value.

[0067] Specifically, when the current information determined in the above step S23 is greater than or equal to the preset current information, it proves that there is a problem of excessive current in the energy storage system at this time. At this time, it is necessary to intervene in the current in the battery cluster. The cluster battery management module controls the current limiting module in the battery cluster to keep the current in the battery cluster at the preset current value.

[0068] S2402: When the current information is less than the preset current information, the cluster battery management module controls the corresponding current limiting module to enter a standby state.

[0069] Specifically, when the current information determined in the above step S23 is less than the preset current information, it proves that the current in the energy storage system at this time does not exceed the limited maximum current value, but it is not yet determined whether the current in the energy storage system at this time is within a reasonable range. Therefore, the cluster battery management module controls the corresponding current limiting module to enter the standby state to perform the next step of current control.

[0070] On the basis of the above-mentioned embodiment, this embodiment further refines the control of opening or closing of the corresponding current limiting module according to the current information and the preset current information. Figure 4 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention, refer to Figure 4 , the control method of the embodiment of the present invention includes:

[0071] S31. Obtain current data corresponding to each battery module.

[0072] S32: Determine current information of the corresponding battery cluster according to the current data.

[0073] S33, controlling the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

[0074] S34: Analyze and compare the current information with the preset current information.

[0075] When the current information is greater than or equal to the preset current information, step S3401 is executed; when the current information is less than the preset current information, step S3402 is executed.

[0076] S3401: When the current information is greater than or equal to the preset current information, the cluster battery management module controls the corresponding current limiting module to keep the current in the battery cluster at the preset current value.

[0077] S3402. Continuously monitor current information.

[0078] Specifically, when the current information is less than the preset current information, it proves that the current in the energy storage system does not exceed the maximum current limit, but it is not yet determined whether the current in the energy storage system is within a reasonable range. The cluster battery management module controls the corresponding current limiting module to enter the standby state to control the current further and continuously monitor the current information of the battery cluster.

[0079] S3403: When the current information is less than or equal to the first threshold current, the cluster battery management module controls the corresponding current limiting module to be turned off.

[0080] Specifically, when the current information is less than or equal to the first threshold current, it means that the current in the energy storage system is within a reasonable current range, and the cluster battery management module controls the corresponding current limiting module to be turned off. At this time, the energy storage system enters a normal state, wherein the first threshold can be set according to actual needs, and exemplarily, it can be 40A.

[0081] Figure 5 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention, refer to Figure 5 Optionally, before obtaining the current data corresponding to the battery module, the method further includes:

[0082] S40: Obtain the working status of the battery module.

[0083] Specifically, the working status of each battery module is obtained, which may be, for example, a charging status, a discharging status, a charging completion status, a discharging completion status, and the like.

[0084] S41. Control the opening or closing of the DC switch in the corresponding battery cluster according to the working state.

[0085] Specifically, the DC switch is a device in the battery cluster for controlling the battery module to perform charging or discharging operations, and controls the opening or closing of the DC switch of the corresponding battery cluster according to the working state of the battery module determined in the above step S40.

[0086] S42. Obtain current data corresponding to each battery module.

[0087] S43: Determine current information of the corresponding battery cluster according to the current data.

[0088] S44, controlling the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

[0089] Figure 6 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention, refer to Figure 6 , get the working status of the battery module, including:

[0090] S50: Detect the state of charge of the battery module.

[0091] The state of charge (SOC) refers to the ratio of the remaining capacity of a battery module after it has worked for a period of time to its capacity in a fully charged state.

[0092] S51 . Determine the charge and discharge state of the corresponding battery cluster according to the state of charge.

[0093] Specifically, the charge and discharge state of the battery cluster is determined according to the state of charge. For example, the SOC change within a preset time period is obtained, and the charge and discharge state of the battery cluster is determined according to the SOC change. When the SOC is less than a preset value, charging is performed; when the SOC is greater than or equal to a preset value, discharging is performed; when the SOC is 0%, it proves that the battery cluster has completed discharging; when the SOC is 100%, it proves that the battery cluster has completed charging. The embodiments of the present invention do not list them all.

[0094] S52, controlling the opening or closing of the DC switch in the corresponding battery cluster according to the working state.

[0095] S53: Obtain current data corresponding to each battery module.

[0096] S54: Determine current information of the corresponding battery cluster according to the current data.

[0097] S55. Control the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

[0098] Figure 7 is a flow chart of another control method of an energy storage system provided by an embodiment of the present invention, refer to Figure 7 , according to the working state, the DC switch in the corresponding battery cluster is controlled to be opened or closed, including:

[0099] S60: Obtain the working status of the battery module.

[0100] S61. When the working state is in charging or discharging, control the DC switch of the corresponding battery cluster to close.

[0101] Specifically, when it is detected that a battery module is being charged or discharged, it indicates that the battery cluster where the battery module is located has not completed charging or discharging, and the DC switch in the current battery cluster is controlled to be closed to keep the battery cluster in a continuous charging or discharging state.

[0102] S62: When the working state is in the state of charging completion or discharging completion, the DC switch of the corresponding battery cluster is controlled to be disconnected.

[0103] Specifically, when it is detected that the battery module is in the process of completing charging or discharging, it indicates that the battery cluster where the battery module is located has completed the charging and discharging tasks, and the DC switch in the current battery cluster is controlled to be disconnected to end the working state of the battery cluster.

[0104] Optionally, when all battery clusters have completed charging or discharging, the DC switches of all battery clusters are disconnected.

[0105] Optionally, when the DC switches of the battery cluster are all in the disconnected state, after obtaining the power-on instruction of the energy storage system, the current data corresponding to each battery module is obtained; the current information of the corresponding battery cluster is determined according to the current data; and the corresponding current limiting module is controlled to be turned on or off according to the current information and preset current information.

[0106] Specifically, when all the battery cluster DC switches are disconnected, it indicates that the energy storage system has completed the charging and discharging tasks, and then executes the following steps: Figure 2 The various steps shown are exemplary, when the energy storage system completes a whole set of charging processes, the DC switches of all battery clusters are disconnected, and then a discharge instruction from the energy storage system is received, and the current monitoring and management of the energy storage system during the discharge process are continued; or when the energy storage system completes a whole set of discharging processes, the DC switches of all battery clusters are disconnected, and then a charging instruction from the energy storage system is received, and the current monitoring and management of the energy storage system during the charging process are continued.

[0107] Optionally, after acquiring the current data corresponding to each battery module, the method may further include generating a required power of the battery module according to the current data, and sending the required power to the cluster battery management module.

[0108] Specifically, after the current data of the battery module is acquired, the real-time required power of the battery module is generated according to the current data, and the required power is sent to the cluster battery management module to adjust the charging and discharging power of the battery cluster in real time.

[0109] Figure 8 is a schematic diagram of a control device for an energy storage system provided by an embodiment of the present invention, with reference to Figure 8 According to the same inventive concept, an embodiment of the present invention provides a control device for an energy storage system, the energy storage system includes a plurality of battery clusters connected in parallel, each battery cluster includes a cluster battery management module, a current limiting module and at least one battery module, the current limiting module is used to keep the current of the battery module within a preset range, the control device includes:

[0110] Acquisition module 2, used to acquire current data corresponding to each battery module;

[0111] A current information determination module 3, used to determine the current information of the corresponding battery cluster according to the current data;

[0112] The control module 4 is used to control the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

[0113] Fig. 9 is a schematic diagram of another control device for an energy storage system provided by an embodiment of the present invention, with reference to Fig. 9 , optionally, further comprising a display module 5;

[0114] The display module 5 is used to display current data and current information.

[0115] Specifically, the display module 5 is used to display information such as current data, current information, and charge status of all battery modules.

[0116] refer to Figure 1 According to the same inventive concept, the present invention provides a control system for an energy storage system, including an inverter 6, a battery array management system 7 and the control device for the energy storage system described in the above-mentioned invention embodiment, and the inverter 6 and the battery array management system 7 are connected via a bus.

[0117] The control system of the energy storage system provided in the embodiment of the present invention can achieve the same technical effect as the control method of the energy storage system described in the above-mentioned embodiment of the invention, and the present invention will not elaborate on it here.

[0118] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for an energy storage system, characterized in that: The energy storage system includes a plurality of battery clusters connected in parallel, each of the battery clusters includes a cluster battery management module, a current limiting module and at least one battery module, the current limiting module is used to keep the current of the battery module within a preset range, and the control method includes: Acquiring current data corresponding to each of the battery modules; Determining current information corresponding to the battery cluster according to the current data; The corresponding current limiting module is controlled to be turned on or off according to the current information and the preset current information.

2. The control method of the energy storage system according to claim 1, characterized in that: The controlling the opening or closing of the corresponding current limiting module according to the current information and the preset current information includes: When the current information is greater than or equal to the preset current information, the cluster battery management module controls the corresponding current limiting module to keep the current in the battery cluster at a preset current value; When the current information is less than the preset current information, the cluster battery management module controls the corresponding current limiting module to enter a standby state.

3. The control method of the energy storage system according to claim 2, characterized in that: When the current information is less than the preset current information, the cluster battery management module controls the corresponding current limiting module to enter a standby state, including: Continuously monitoring the current information; When the current information is less than or equal to a first threshold current, the cluster battery management module controls the corresponding current limiting module to be turned off.

4. The control method of the energy storage system according to claim 1, characterized in that: Before obtaining the current data corresponding to the battery module, the method further includes: Obtaining the working status of the battery module; The opening or closing of the DC switch in the corresponding battery cluster is controlled according to the working state.

5. The control method of the energy storage system according to claim 4, characterized in that: The obtaining the working status of the battery module includes: detecting a state of charge of the battery module; A charge and discharge state of the battery cluster is determined according to the state of charge.

6. The control method of the energy storage system according to claim 4, characterized in that: The controlling the opening or closing of the DC switch in the battery cluster according to the working state includes: When the working state is in charging or discharging, controlling the DC switch of the corresponding battery cluster to close; When the working state is in the state of charging completion or discharging completion, the DC switch of the corresponding battery cluster is controlled to be disconnected.

7. The control method of the energy storage system according to claim 6, characterized in that: Also includes: When the DC switches of the battery cluster are all in the off state, after obtaining the power-on instruction of the energy storage system, the current data corresponding to each of the battery modules is obtained; Determining current information corresponding to the battery cluster according to the current data; The corresponding current limiting module is controlled to be turned on or off according to the current information and the preset current information.

8. A control device for an energy storage system, characterized in that: The energy storage system includes a plurality of battery clusters connected in parallel, each of the battery clusters includes a cluster battery management module, a current limiting module and at least one battery module, the current limiting module is used to keep the current of the battery module within a preset range, and the control device includes: An acquisition module, used for acquiring current data corresponding to each of the battery modules; A current information determination module, used to determine the current information corresponding to the battery cluster according to the current data; A control module is used to control the opening or closing of the corresponding current limiting module according to the current information and the preset current information.

9. The control device of the energy storage system according to claim 8, characterized in that: The control device also includes a display module; The display module is used to display the current data and the current information.

10. A control system for an energy storage system, characterized in that: It comprises an inverter, a battery array management system and a control device for the energy storage system according to claim 8 or 9; the inverter and the battery array management system are connected via a bus.

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