Energy storage system, control method and electrical equipment

Abstract

The present application relates to the field of industrial and commercial energy storage technology, and in particular to an energy storage system, a control method, and an electrical device. An energy storage system comprises: at least one energy storage device, wherein the energy storage device comprises a host control module and a slave control module, the energy storage device enabled by the host control module is the host, and the energy storage device enabled by the slave control module is the slave; the host control module is used to distribute power to each of the slaves according to the charge and discharge power information sent by each slave control module, and send the determined target charge and discharge power to each corresponding slave control module; the slave control module is used to control the slave to perform charge and discharge according to the target charge and discharge power sent by the host control module. The present invention establishes a master-slave architecture of the energy storage system by taking any energy storage device in the energy storage system as the host, thereby reducing the number of controllers and increasing the flexibility of the product.

Description

Technical Field

[0001] The present application relates to the field of industrial and commercial energy storage technology, and in particular to an energy storage system, a control method, and electrical equipment. Background Art

[0002] In 400V industrial and commercial energy storage scenarios, industrial and commercial energy storage is integrated into cabinets, each of which requires a system control unit (SCU). To connect multiple cabinets in the energy storage system to a 400V transformer for energy storage, an SCU is required as the master to distribute power to other cabinets, thus implementing the local energy management function of the energy storage system.

[0003] In the related art, an additional host controller is required to control each integrated cabinet, but this will increase system cost, increase maintenance difficulty, and reduce system flexibility. Summary of the Invention

[0004] Embodiments of the present invention provide an energy storage system, a control method, and an electrical device to solve the problem of poor flexibility caused by the presence of an additional controller in the energy storage system in the prior art.

[0005] In a first aspect, an embodiment of the present invention provides an energy storage system, comprising: at least one energy storage device, wherein the energy storage device includes a host control module and a slave control module, wherein the energy storage device enabled by the host control module is a host, and the energy storage device enabled by the slave control module is a slave;

[0006] The host control module is used to distribute power to each slave according to the charge and discharge power information sent by each slave control module, and send the determined target charge and discharge power to each corresponding slave control module;

[0007] The slave control module is used to control the slave to perform charging and discharging according to the target charging and discharging power sent by the host control module;

[0008] Wherein, the host control module further includes a power distribution module PWRD, and the slave control module further includes a slave power distribution module SUBP;

[0009] The SUBP is configured to send the charge and discharge power information of the corresponding slave to the PWRD according to a preset time interval, and perform charge and discharge according to the target charge and discharge power sent by the PWRD, wherein the charge and discharge power information includes the allowed continuous charge and discharge power of the slave;

[0010] The PWRD is used to receive the allowed continuous charge and discharge power sent by each SUBP, determine the allowed continuous charge and discharge total power, and determine the target charge and discharge power of each slave based on the allowed continuous charge and discharge total power, the allowed continuous charge and discharge power of each slave and the total power to be allocated, and send the target charge and discharge power to each slave.

[0011] Optionally, when the slave control module in the host is enabled, the host also acts as a slave, and the host control module allocates power to it, and the slave control module controls it to perform slave charging and discharging.

[0012] Optionally, when the energy storage system includes at least two energy storage devices, the host control module and the slave control module in the host are enabled, the slave control modules in each of the slaves are enabled, and the host control module is not enabled. The host control module is used to distribute power to its own slave and other slaves.

[0013] Optionally, when the energy storage system includes only one energy storage device, the host control module and the slave control module in the host are enabled, and the host control module distributes power to its own slaves.

[0014] Optionally, the SUBP is further configured to perform local power distribution to distribute the target charging and discharging power to each energy storage converter PCS under the slave machine.

[0015] Optionally, the host control module further includes: a planning curve module ECOC, an anti-backflow control module ACCC and a demand control module DEMC;

[0016] The ECOC is used to determine the total power to be allocated through a planning curve;

[0017] The ACCC is used to perform local anti-backflow control of the anti-backflow meter, wherein the energy storage system also includes an anti-backflow meter;

[0018] The DEMC is used to perform local demand control of the energy storage system.

[0019] In a second aspect, an embodiment of the present invention provides a control method for an energy storage system, characterized in that the method is applied to a host control module in an energy storage device serving as a host, the energy storage device including a host control module and a slave control module, the energy storage device enabled by the host control module serving as the host, the method comprising:

[0020] Receive the charge and discharge power information sent by each slave control module, and distribute power to each slave according to the charge and discharge power information, wherein the slave is an energy storage device enabled by the slave control module;

[0021] Sending the determined target charge and discharge power to each corresponding slave control module;

[0022] The slave control module includes a slave power distribution module SUBP, which is used to control the slave to perform charging and discharging according to the target charging and discharging power sent by the host control module;

[0023] The charge and discharge power information includes the allowed continuous charge and discharge power of the slave. The host control module also includes a power distribution module PWRD, which is used to distribute power to each slave according to the charge and discharge power information, including:

[0024] Obtaining the allowed continuous charge and discharge power of each slave at every preset time interval, wherein the allowed continuous charge and discharge power of each slave is sent by the SUBP of each slave;

[0025] Determining the allowed continuous charge and discharge total power according to the allowed continuous charge and discharge power of each slave;

[0026] The target charge and discharge power of each slave is determined according to the total power to be allocated, the allowed continuous charge and discharge total power, and the allowed continuous charge and discharge power of each slave.

[0027] Optionally, a method for determining the target charge and discharge power of each slave device includes:

[0028] ;

[0029] Among them, the PD i is the target charge and discharge power of the i-th slave in the energy storage system, and the P t is the total power to be allocated, the PA i is the allowed continuous charge and discharge power of the i-th slave in the energy storage system, and n is the number of slaves in the energy storage system.

[0030] Optionally, the host control module further includes: a planning curve module ECOC, an anti-backflow control module ACCC and a demand control module DEMC;

[0031] The ECOC is used to determine the total power to be allocated through the planning curve;

[0032] The ACCC is used to perform local anti-backflow control of the anti-backflow meter, wherein the energy storage system also includes the anti-backflow meter;

[0033] The DEMC is used to perform local demand control of the energy storage system.

[0034] Optionally, sending the determined target charge and discharge power to each corresponding slave control module includes:

[0035] Determine a power array according to the target charge and discharge power of each slave;

[0036] When the valid bit in the valid bit array corresponding to the position in the power array is a valid character, the corresponding power array is sent to the corresponding slave control module;

[0037] The dimensions of the power array and the effective bit array are the same as the number of slaves.

[0038] Optionally, the method further includes:

[0039] Determine the function configuration word by inputting instructions;

[0040] enabling the host control module and / or the slave control module according to the function configuration word;

[0041] Wherein, when the host control module is enabled, the energy storage device including the host control module is the host; when the slave control module is enabled, the energy storage device including the slave control module is the slave;

[0042] When the slave control module in the host is enabled, the host also acts as a slave, and the host control module allocates power to it, and the slave control module controls it to perform charging and discharging of the slave.

[0043] In a third aspect, an embodiment of the present invention provides an electrical device, comprising an energy storage device in the energy storage system described in any one of the first aspects, and configured to execute the control method for the energy storage system described in any one of the second aspects.

[0044] In an embodiment of the present invention, by using any energy storage device in the energy storage system as the master, a flexible master-slave architecture is established for the energy storage system. This allows for distributed coordination among the various energy storage devices in the energy storage system, while also enabling energy management of the energy storage system, and optimizing charging and discharging strategies. Using any energy storage device in the energy storage system as the master also reduces the number of controllers and increases product flexibility. Furthermore, flexible switching between master and slave devices ensures rapid reconfiguration of the energy storage system in the event of a master failure, improving the robustness of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0046] Figure 1FIG2 is a schematic structural diagram of an energy storage system provided in an embodiment of the present application;

[0047] Figure 2 FIG2 is a schematic structural diagram of another energy storage system provided in an embodiment of the present application;

[0048] Figure 3 FIG2 is a schematic structural diagram of another energy storage system provided in an embodiment of the present application;

[0049] Figure 4 Shown is a flow chart of a control method for an energy storage system provided by an embodiment of the present application;

[0050] Figure 5 Shown is a structural schematic diagram of an electrical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0052] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0053] like Figure 1 FIG2 is a schematic diagram of the structure of an energy storage system provided by an embodiment of the present invention. Figure 1 The energy storage system includes at least one energy storage device and an anti-backflow meter. Each energy storage device includes a master control module and a slave control module. Each energy storage device in the energy storage system can be the same energy storage device.

[0054] Generally, an energy storage system may include an energy management system (EMS), and the energy storage equipment may be implemented as an industrial and commercial integrated cabinet.

[0055] Each energy storage device is divided into a master and a slave based on whether the master control module and the slave control module are enabled. Among them, the energy storage device enabled by the master control module is the master, and the energy storage device enabled by the slave control module is the slave.

[0056] The host control module is used to implement energy storage control of the energy storage system, specifically to distribute power to each slave according to the charge and discharge power information sent by each slave control module, and send the determined target charge and discharge power to each corresponding slave control module.

[0057] The slave control module is used to control the slave to perform charging and discharging according to the target charging and discharging power sent by the host control module.

[0058] A backflow meter is used to power the energy storage system. It connects to the input of the host control module and supplies power to the energy storage system through the host. Typically, this meter is a 400V meter.

[0059] Specifically, the host control module includes a power distribution module (PWRD), and the slave control module includes a slave power distribution module (SUBP).

[0060] SUBP is used to send the corresponding slave's charge and discharge power information to the master's PWRD at preset time intervals, and to perform charging and discharging according to the target charge and discharge power sent by PWRD. The charge and discharge power information specifically includes the slave's allowed continuous charge and discharge power.

[0061] PWRD is used to receive the allowed continuous charge and discharge power sent by the SUBP deployed in each slave, determine the allowed total continuous charge and discharge power, and determine the target charge and discharge power of each slave based on the allowed total continuous charge and discharge power, the allowed continuous charge and discharge power of each slave and the total power to be allocated, and send the target charge and discharge power to the slave control module of each slave.

[0062] In this embodiment of the present invention, when the slave control module within the host is enabled, the host also functions as a slave, with the slave control module sending charge and discharge power information to the host control module. The host control module simultaneously allocates power to its own slaves and other slaves. The host's own slave control module also executes slave charging and discharging according to the target charge and discharge power sent by the host control module.

[0063] Among them, such as Figure 2 FIG2 is a structural diagram of another energy storage system provided by an embodiment of the present invention, which is a specific energy storage system. Figure 2 When the energy storage system includes at least two energy storage devices, the master control module and slave control module in the master are enabled. The slave control modules in each slave are enabled, while the master control module is disabled. The master performs power distribution while also performing energy storage as a slave, distributing power to itself and other slaves.

[0064] like Figure 3 FIG2 is a structural diagram of another energy storage system provided by an embodiment of the present invention, which is another specific energy storage system. Figure 3When the energy storage system includes only one energy storage device, the host control module and the slave control module in the host are enabled. The host performs power distribution while also performing energy storage as a slave, which is used to distribute power to its own slaves.

[0065] Furthermore, SUBP is also used to perform local power allocation. Figure 1 As shown in Figure 3, each slave also includes several power conversion systems (PCSs). The SUBP further distributes the allocated target charge and discharge power to each PCS to achieve energy storage.

[0066] The power allocation method of SUBP is the same as that of PWRD, and needs to be allocated based on the charge and discharge power information of each PCS.

[0067] In the embodiment of the present invention, the host control module further includes: an economy control module (ECOC), an anti-counter current control module (ACCC), and a demand control module (DEMC).

[0068] ECOC is used to determine the total power to be distributed through the planning curve; ACCC is used to perform local anti-backflow control of the anti-backflow meter; DEMC is used to perform local demand control of the energy storage system.

[0069] Combine Figure 1 The energy storage system shown in the embodiment of the present invention also provides a control method for the energy storage system, which is applied to Figure 1 Host Control Module shown. Figure 4 , the specific steps of the method include:

[0070] S401 , receiving charging and discharging power information sent by each slave control module, and distributing power to each slave according to the charging and discharging power information.

[0071] Specifically, the ECOC in the host control module determines the total power to be allocated using a planned curve. After determining the total power to be allocated, the ECOC sends this information to the host control module's PWRD. The host control module's PWRD obtains the charge and discharge power information reported by each slave via the SUBP at predetermined intervals, specifically the allowed continuous charge and discharge power of each slave. Based on the allowed continuous charge and discharge power of each slave, the PWRD determines the allowed total continuous charge and discharge power. Consequently, the target charge and discharge power for each slave is determined based on the total power to be allocated, the allowed total continuous charge and discharge power, and the allowed continuous charge and discharge power of each slave.

[0072] The target charge and discharge power of each slave is determined as follows:

[0073] ;

[0074] Among them, PD i is the target charge and discharge power of the i-th slave in the energy storage system, P t is the total power to be allocated, PA i is the allowed continuous charge and discharge power of the i-th slave in the energy storage system, and n is the number of slaves in the energy storage system.

[0075] Optionally, the host control module also performs local anti-backflow control of the anti-backflow meter through ACCC, and performs local demand control of the energy storage system through DEMC.

[0076] S402: Send the determined target charge and discharge power to each corresponding slave control module.

[0077] Specifically, in order to achieve unified management of various energy storage devices in the energy storage system, the target charging and discharging power is sent in the form of a power array and a valid bit array.

[0078] A power array is determined based on the target charge and discharge power determined for each slave. When the valid bit in the valid bit array corresponding to the position in the power array is a valid character, the corresponding power array is sent to the corresponding slave control module. Specifically, it is sent to the SUBP of each slave control module.

[0079] After receiving the target charge and discharge power through the power array, the SUBP in the slave control module is used to control the slave to perform charge and discharge according to the target charge and discharge power.

[0080] The dimensions of the power array and the effective bit array are the same as the number of slaves, so that power can be allocated to each slave. The master controller and the slave controllers communicate using the MQTT protocol.

[0081] In a specific embodiment, the energy storage system includes 10 energy storage devices. The master control module allocates a target charging power of 10 to each of the 10 slaves. The power array can be determined to be [10, 10, 10, 10, 10, 10, 10, 10, 10]. When the valid bit array is determined to be [1, 1, 1, 1, 1, 1, 1, 1, 1], meaning that all valid bits in the valid bit array are valid characters, the corresponding power array is sent to the corresponding slave controller, which controls each slave to charge at 10 kW.

[0082] Optionally, in an embodiment of the present invention, each energy storage device in the energy storage system needs to be pre-determined as a master or a slave. The master control module and / or the slave control module need to be enabled by a function configuration word, thereby determining the energy storage device as a master or a slave.

[0083] Specifically, the energy storage device receives an input instruction from a user and determines a function configuration word based on the input instruction. Based on the function configuration word, the host control module and / or the slave configuration module are enabled. The energy storage device enabled by the host control module based on the user input instruction is the master, and the energy storage device enabled by the slave control module based on the user input instruction is the slave.

[0084] Optionally, in some embodiments, after receiving the target charge and discharge power, the slave device also needs to perform local power distribution to distribute the target charge and discharge power to each PCS under the slave device.

[0085] The local power allocation method of the slave is the same as that of the master, and needs to be allocated based on the charge and discharge power information of each PCS.

[0086] Specifically, the slave obtains the allowed continuous charge and discharge power of each PCS, determines the total allowed continuous charge and discharge power, uses the target charge and discharge power allocated by the master as the total power to be allocated, and determines the target charge and discharge power for each PCS based on the total allowed continuous charge and discharge power and the allowed continuous charge and discharge power of each PCS. This power is then sent to each PCS for charging and discharging. Communication between the slave and each PCS occurs via the Modbus TCP protocol.

[0087] In an embodiment of the present invention, by using any energy storage device in the energy storage system as the master, a flexible master-slave architecture is established for the energy storage system. This allows for distributed coordination among the various energy storage devices in the energy storage system, optimizing charging and discharging strategies while enabling the EMS functionality of the energy storage system. Using any energy storage device in the energy storage system as the master also reduces the number of controllers and increases product flexibility. Furthermore, flexible switching between master and slave devices ensures rapid reconfiguration of the energy storage system in the event of a master failure, enhancing the robustness of the energy storage system.

[0088] Figure 5 This is a schematic diagram of the structure of an embodiment of the electrical equipment in this specification. The electrical equipment can be specifically Figure 1 Energy storage devices in Figure 5 As shown, the above-mentioned electrical equipment may include at least one processor; and at least one memory communicatively connected to the above-mentioned processing unit, wherein: the memory stores program instructions that can be executed by the processing unit, and the above-mentioned processor calls the above-mentioned program instructions to execute the control method of the energy storage system provided in this embodiment.

[0089] The above-mentioned electric device can be a device that can conduct intelligent dialogue with the user, such as a cloud server. The embodiments of this specification do not limit the specific form of the above-mentioned electric device. It is understandable that the electric device here is the machine mentioned in the method embodiment.

[0090] Figure 5 A block diagram of an exemplary powered device suitable for implementing the embodiments of the present specification is shown. Figure 5 The electrical equipment shown is only an example and should not limit the functions and scope of use of the embodiments of this specification.

[0091] like Figure 5 As shown, the power consumption device is represented as a general-purpose computing device. Components of the power consumption device may include, but are not limited to: one or more processors 510, a communication interface 520, a memory 530, and a communication bus 540 connecting different system components (including the memory 530, the communication interface 520, and the processor 510).

[0092] Communication bus 540 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnection (PCI) bus.

[0093] Powered devices typically include a variety of computer system readable media, which can be any available media that can be accessed by the powered device, including volatile and non-volatile media, removable and non-removable media.

[0094] Memory 530 may include computer-readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The power-consuming device may further include other removable / non-removable, volatile / non-volatile computer storage media. Memory 530 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of various embodiments of this specification.

[0095] A program / utility having a set (at least one) of program modules may be stored in memory 530. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules generally implement the functions and / or methods of the embodiments described herein.

[0096] The processor 510 executes various functional applications and data processing by running the programs stored in the memory 530, such as implementing the control method of the energy storage system provided in the embodiments shown in this specification.

[0097] An embodiment of this specification provides a non-transitory computer-readable storage medium, which stores computer instructions. The computer instructions enable the computer to execute the energy storage system control method provided by the embodiment shown in this specification.

[0098] The non-transitory computer-readable storage medium may employ any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more conductors, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0099] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0100] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0101] Computer program code for performing the operations of this specification may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages such as Java, Smalltalk, and C++, as well as conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0102] The foregoing description of this specification describes specific embodiments. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0103] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout this specification, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0104] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of this specification includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of this specification belong.

[0105] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0106] It should be noted that the terminals involved in the embodiments of this specification may include but are not limited to personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 players, MP4 players, etc.

[0107] In the embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some interface, indirect coupling or communication connection of the device or unit, which may be electrical, mechanical or other forms.

[0108] In addition, the functional units in the various embodiments of this specification may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or hardware plus software functional units.

[0109] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit stored in a storage medium includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute some of the steps of the method described in various embodiments of this specification.

[0110] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. An energy storage system, characterized in that: include: At least one energy storage device, wherein the energy storage device includes a host control module and a slave control module, the energy storage device enabled by the host control module is a host, and the energy storage device enabled by the slave control module is a slave; The host control module is used to distribute power to each slave according to the charge and discharge power information sent by each slave control module, and send the determined target charge and discharge power to each corresponding slave control module; The slave control module is used to control the slave to perform charging and discharging according to the target charging and discharging power sent by the host control module; Wherein, the host control module further includes a power distribution module PWRD, and the slave control module further includes a slave power distribution module SUBP; The SUBP is configured to send the charge and discharge power information of the corresponding slave to the PWRD according to a preset time interval, and perform charge and discharge according to the target charge and discharge power sent by the PWRD, wherein the charge and discharge power information includes the allowed continuous charge and discharge power of the slave; The PWRD is used to receive the allowed continuous charge and discharge power sent by each SUBP, determine the allowed continuous charge and discharge total power, and determine the target charge and discharge power of each slave according to the allowed continuous charge and discharge total power, the allowed continuous charge and discharge power of each slave, and the total power to be allocated, and send the target charge and discharge power to each slave; When the slave control module in the host is enabled, the host also acts as a slave, and the host control module allocates power to it, and the slave control module controls it to perform the charging and discharging of the slave; When the energy storage system includes at least two energy storage devices, the host control module and the slave control module in the host are enabled, and the host performs power distribution while also performing energy storage as a slave. The host control module is used to distribute power to its own slave and other slaves, and the slave control modules in the other slaves are enabled, while the host control module is not enabled.

2. The energy storage system according to claim 1, characterized in that When the energy storage system includes only one energy storage device, the host control module and the slave control module in the host are enabled, and the host control module distributes power to its own slaves.

3. The energy storage system according to claim 1, characterized in that The SUBP is further configured to perform local power distribution to distribute the target charge and discharge power to each energy storage converter PCS under the slave machine.

4. The energy storage system according to claim 1, characterized in that The host control module also includes: a planning curve module ECOC, an anti-backflow control module ACCC and a demand control module DEMC; The ECOC is used to determine the total power to be allocated through a planning curve; The ACCC is used to perform local anti-backflow control of the anti-backflow meter, wherein the energy storage system also includes an anti-backflow meter; The DEMC is used to perform local demand control of the energy storage system.

5. A control method for an energy storage system, characterized in that: The method is applied to a host control module in an energy storage device serving as a host, wherein the energy storage device includes a host control module and a slave control module, and the energy storage device enabled by the host control module serves as the host. The method includes: Receive the charge and discharge power information sent by each slave control module, and distribute power to each slave according to the charge and discharge power information, wherein the slave is an energy storage device enabled by the slave control module; Sending the determined target charge and discharge power to each corresponding slave control module; The slave control module includes a slave power distribution module SUBP, which is used to control the slave to perform charging and discharging according to the target charging and discharging power sent by the host control module; The charge and discharge power information includes the allowed continuous charge and discharge power of the slave, and the host control module further includes a power distribution module PWRD, which is used to distribute power to each slave according to the charge and discharge power information, including: Obtaining the allowed continuous charge and discharge power of each slave at every preset time interval, wherein the allowed continuous charge and discharge power of each slave is sent by the SUBP of each slave; Determining the allowed continuous charge and discharge total power according to the allowed continuous charge and discharge power of each slave; Determining the target charge and discharge power of each slave according to the total power to be allocated, the allowed continuous charge and discharge total power, and the allowed continuous charge and discharge power of each slave; When the slave control module in the host is enabled, the host also acts as a slave, and the host control module allocates power to it, and the slave control module controls it to perform the charging and discharging of the slave; When the energy storage system includes at least two energy storage devices, the host control module and the slave control module in the host are enabled, and the host performs power distribution while also performing energy storage as a slave. The host control module is used to distribute power to its own slave and other slaves, and the slave control modules in the other slaves are enabled, while the host control module is not enabled.

6. The control method of the energy storage system according to claim 5, characterized in that: The target charge and discharge power of each slave is determined by: ； Among them, the PD i is the target charge and discharge power of the i-th slave in the energy storage system, and the P t is the total power to be allocated, the PA i is the allowed continuous charge and discharge power of the i-th slave in the energy storage system, and n is the number of slaves in the energy storage system.

7. The control method of the energy storage system according to claim 5, characterized in that: The host control module also includes: a planning curve module ECOC, an anti-backflow control module ACCC and a demand control module DEMC; The ECOC is used to determine the total power to be allocated through the planning curve; The ACCC is used to perform local anti-backflow control of the anti-backflow meter, wherein the energy storage system also includes the anti-backflow meter; The DEMC is used to perform local demand control of the energy storage system.

8. The control method of the energy storage system according to claim 5, characterized in that: The step of sending the determined target charge and discharge power to each corresponding slave control module includes: Determine a power array according to the target charge and discharge power of each slave; When the valid bit in the valid bit array corresponding to the position in the power array is a valid character, the corresponding power array is sent to the corresponding slave control module; The dimensions of the power array and the effective bit array are the same as the number of slaves.

9. The control method of the energy storage system according to claim 5, characterized in that: The method further comprises: Determine the function configuration word by inputting instructions; enabling the host control module and / or the slave control module according to the function configuration word; Wherein, when the host control module is enabled, the energy storage device including the host control module is the host; when the slave control module is enabled, the energy storage device including the slave control module is the slave; When the slave control module in the host is enabled, the host also acts as a slave, and the host control module allocates power to it, and the slave control module controls it to perform charging and discharging of the slave.

10. An electrical device comprising the energy storage device in the energy storage system according to any one of claims 1 to 4, and configured to execute the control method of the energy storage system according to any one of claims 5 to 9.

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