Energy storage system, control method thereof and power utilization system

Abstract

The invention provides an energy storage system, a control method thereof and a power utilization system, and relates to the technical field of energy storage. The energy storage system comprises a first energy storage subsystem, a second energy storage subsystem and an energy storage inverter, the first energy storage subsystem is provided with a first battery system and a first battery management system, and the first battery management system is electrically connected with the first battery system; the second energy storage subsystem is provided with a second battery system and a second battery management system, the second battery system comprises a first battery sub-cluster and a second battery sub-cluster, the second battery management system is electrically connected with the first battery sub-cluster and the second battery sub-cluster, and the second battery management system is in communication connection with the first battery management system; the energy storage inverter is electrically connected with the first battery system and the first battery sub-cluster or the second battery sub-cluster, and the energy storage inverter is in communication connection with the first battery management system; and the first battery management system performs charge and discharge cooperative control on the first battery sub-cluster.

Description

Technical Field

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

[0002] The energy storage system includes battery packs, energy management system (EMS), battery management system (BMS), power conversion system (PCS), and other electrical equipment. During the operation of the energy storage system, the BMS collects the performance parameters of the battery pack, and the BMS shares the performance parameters of the battery pack with the EMS and PCS. The EMS sends control instructions to the PCS and BMS according to the optimization and scheduling strategy to control the battery to complete charging and discharging.

[0003] In related technologies, energy storage products adopt modular design, based on the flexible combination of prefabricated cabins, which can meet energy storage needs of different capacities. However, in the energy storage system, the PCS power cannot match the capacity of the standard prefabricated cabin, which affects the efficiency of the energy storage system; non-standard prefabricated cabins may lead to waste of resources, reduce the generation efficiency and product consistency, and the prefabricated cabins have poor matching with PCS. Summary of the invention

[0004] The present disclosure provides an energy storage system and a control method thereof, and an electricity consumption system, which at least to a certain extent overcome the problem of poor matching between a prefabricated cabin and an energy storage inverter in an energy storage system provided in the related art.

[0005] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0006] According to one aspect of the present disclosure, there is provided an energy storage system, comprising: a first energy storage subsystem, the first energy storage subsystem being provided with a first battery system and a first battery management system, the first battery management system being electrically connected to the first battery system; a second energy storage subsystem, the second energy storage subsystem being provided with a second battery system and a second battery management system, the second battery system comprising a first battery subcluster and a second battery subcluster, the second battery management system being electrically connected to the first battery subcluster and the second battery subcluster, and the second battery management system being communicatively connected to the first battery management system; an energy storage inverter, the energy storage inverter being electrically connected to the first battery system, and the first battery subcluster or the second battery subcluster, and the energy storage inverter being communicatively connected to the first battery management system; wherein the first battery management system performs coordinated charging and discharging control on the first battery subcluster.

[0007] In one embodiment of the present disclosure, the energy storage inverter includes a first energy storage inverter and a second energy storage inverter; wherein, the first energy storage inverter is electrically connected to the first battery system and the first battery sub-cluster, and the first energy storage inverter is communicatively connected to the first battery management system; the energy storage system also includes a third energy storage subsystem, the third energy storage subsystem is provided with a third battery system and a third battery management system, the second energy storage inverter is electrically connected to the third battery system and the second battery sub-cluster, and the third battery management system is communicatively connected to the second battery management system; wherein, the first battery management system performs coordinated charging and discharging control on the first battery sub-cluster; and / or the third battery management system performs coordinated charging and discharging control on the second battery sub-cluster.

[0008] In one embodiment of the present disclosure, the first battery management system is used to send a first collaborative control request instruction to the second battery management system when the first battery management system is fault-free and in a standby state; the second battery management system is used to receive the first collaborative control request instruction and send battery information of the first battery sub-cluster to the first battery management system when the second battery management system is fault-free and in a standby state; the first battery management system is also used to process the collected battery information of the first battery system and the received battery information of the first battery sub-cluster, obtain the standby state and charge and discharge data of the first battery management system and the second battery management system, and send them to the first energy storage inverter; the first energy storage inverter is used to configure charge and discharge parameters according to the standby state and charge and discharge data of the first battery management system and the second battery management system, and send the charge and discharge parameters to the first battery management system, so that the first battery management system performs charge and discharge collaborative control on the first battery sub-cluster according to the charge and discharge parameters.

[0009] In one embodiment of the present disclosure, the third battery management system is used to send a second collaborative control request instruction to the second battery management system when the third battery management system is fault-free and in a standby state; the second battery management system is used to receive the second collaborative control request instruction and send battery information of the second battery sub-cluster to the third battery management system when the second battery management system is fault-free and in a standby state; the third battery management system is also used to process the collected battery information of the third battery system and the received battery information of the second battery sub-cluster, obtain the standby state and charge and discharge data of the third battery management system and the second battery management system, and send them to the second energy storage inverter; the second energy storage inverter is used to configure charge and discharge parameters according to the standby state and charge and discharge data of the third battery management system and the second battery management system, obtain the charge and discharge parameters and send them to the third battery management system, so that the third battery management system performs charge and discharge collaborative control on the second battery sub-cluster according to the charge and discharge parameters.

[0010] In one embodiment of the present disclosure, the first battery sub-cluster and the second battery sub-cluster are electrically connected to the energy storage inverter via a switching element, and the switching element is used to selectively electrically connect the first battery sub-cluster and the second battery sub-cluster to the energy storage inverter so that the first battery management system can perform time-sharing charging and discharging coordinated control on the first battery sub-cluster and the second battery sub-cluster.

[0011] In one embodiment of the present disclosure, the first battery management system is used to send a third collaborative control request instruction to the second battery management system when the first battery management system is fault-free and in a standby state; the second battery management system is used to receive the third collaborative control request instruction when the second battery management system is fault-free and in a standby state, control the switch element to make the target battery subcluster and the energy storage inverter conductive, and send battery information of the target battery subcluster to the first battery management system, where the target battery subcluster is the first battery subcluster or the second battery subcluster; the first battery management system is also used to process the collected battery information of the first battery system and the received battery information of the target battery subcluster, obtain the standby state and charge and discharge data of the first battery management system and the second battery management system, and send them to the energy storage inverter; the energy storage inverter is used to configure charge and discharge parameters according to the standby state and charge and discharge data of the first battery management system and the second battery management system, and send the charge and discharge parameters to the first battery management system, so that the first battery management system performs charge and discharge collaborative control on the target battery subcluster according to the charge and discharge parameters.

[0012] In one embodiment of the present disclosure, the energy storage system further includes an energy management system, which is communicatively connected with the first battery management system, the second battery management system, and the third battery management system.

[0013] According to another aspect of the present disclosure, a control method for an energy storage system is provided. Using the energy storage system in the above embodiment, the method includes: performing charge and discharge coordinated control on a first battery sub-cluster through a first battery management system.

[0014] In one embodiment of the present disclosure, an energy storage inverter includes a first energy storage inverter and a second energy storage inverter; wherein, the first energy storage inverter is electrically connected to the first battery system and the first battery sub-cluster, and the first energy storage inverter is communicatively connected to the first battery management system; the energy storage system also includes a third energy storage subsystem, the third energy storage subsystem is provided with a third battery system and a third battery management system, the second energy storage inverter is electrically connected to the third battery system and the second battery sub-cluster, and the third battery management system is communicatively connected to the second battery management system; wherein, the method also includes: performing coordinated charging and discharging control on the first battery sub-cluster through the first battery management system; performing coordinated charging and discharging control on the second battery sub-cluster through the third battery management system.

[0015] In one embodiment of the present disclosure, the coordinated charging and discharging control of the first battery sub-cluster through the first battery management system includes: when the first battery management system is fault-free and in a standby state, the first battery management system sends a first coordinated control request instruction to the second battery management system; when the second battery management system is fault-free and in a standby state, the second battery management system receives the first coordinated control request instruction and sends battery information of the first battery sub-cluster to the first battery management system; the first battery management system processes the collected battery information of the first battery system and the received battery information of the first battery sub-cluster, obtains the standby state and charging and discharging data of the first battery management system and the second battery management system, and sends them to the first energy storage inverter; the first energy storage inverter configures charging and discharging parameters according to the standby state and charging and discharging data of the first battery management system and the second battery management system, and sends the values ​​of the charging and discharging parameters to the first battery management system; the first battery management system performs coordinated charging and discharging control of the first battery sub-cluster according to the charging and discharging parameters.

[0016] In one embodiment of the present disclosure, the coordinated charging and discharging control of the second battery sub-cluster through the third battery management system includes: when the third battery management system is fault-free and in a standby state, the third battery management system sends a second coordinated control request instruction to the second battery management system; when the second battery management system is fault-free and in a standby state, the second battery management system receives the second coordinated control request instruction and sends battery information of the second battery sub-cluster to the third battery management system; the third battery management system processes the collected battery information of the third battery system and the received battery information of the second battery sub-cluster, obtains the standby state and charging and discharging data of the third battery management system and the second battery management system, and sends them to the second energy storage inverter; the second energy storage inverter configures charging and discharging parameters according to the standby state and charging and discharging data of the third battery management system and the second battery management system, and sends the charging and discharging parameters to the third battery management system; the third battery management system performs coordinated charging and discharging control of the second battery sub-cluster according to the charging and discharging parameters.

[0017] In one embodiment of the present disclosure, the first battery subcluster and the second battery subcluster are electrically connected to the energy storage inverter via a switching element, and the switching element is used to selectively electrically connect the first battery subcluster and the second battery subcluster to the energy storage inverter so that the first battery management system performs time-sharing charging and discharging coordinated control on the first battery subcluster and the second battery subcluster; wherein, the charging and discharging coordinated control of the first battery subcluster by the first battery management system includes: when the first battery management system has no faults and is in a standby state, the first battery management system sends a third coordinated control request instruction to the second battery management system; when the second battery management system has no faults and is in a standby state, the second battery management system receives the third coordinated control request instruction and controls the switch The element electrically connects the target battery subcluster to the energy storage inverter, and sends the battery information of the target battery subcluster to the first battery management system, where the target battery subcluster is the first battery subcluster or the second battery subcluster; the first battery management system processes the collected battery information of the first battery system and the received battery information of the target battery subcluster, obtains the standby status and charge and discharge data of the first battery management system and the second battery management system, and sends them to the energy storage inverter; the energy storage inverter configures charge and discharge parameters according to the standby status and charge and discharge data of the first battery management system and the second battery management system, and sends the charge and discharge parameters to the first battery management system; the first battery management system performs coordinated charge and discharge control on the target battery subcluster according to the charge and discharge parameters.

[0018] According to another aspect of the present disclosure, there is provided an electricity consumption system, comprising: the above-mentioned energy storage system, wherein the energy storage system is electrically connected to a power grid.

[0019] In an embodiment of the present disclosure, the energy storage system includes a first energy storage subsystem, a second energy storage subsystem and an energy storage inverter. The first energy storage subsystem is provided with a first battery system and a first battery management system, and the first battery management system is electrically connected to the first battery system; the second energy storage subsystem is provided with a second battery system and a second battery management system, the second battery system includes a first battery subcluster and a second battery subcluster, the second battery management system is electrically connected to the first battery subcluster and the second battery subcluster, and the second battery management system is communicatively connected to the first battery management system; the energy storage inverter is electrically connected to the first battery system and the first battery subcluster or the second battery subcluster, and the energy storage inverter is communicatively connected to the first battery management system The first battery management system performs coordinated charging and discharging control on the first battery sub-cluster. On the one hand, by dividing and controlling the battery clusters in the second energy storage subsystem, the first battery management system performs coordinated charging and discharging control on the battery sub-clusters in the second energy storage subsystem. Without changing the original energy storage subsystem control architecture, the number of energy storage inverters is saved, so that the energy storage subsystem meets the requirements of high-power PCS products, and the energy storage subsystem is more compatible with the PCS, has a wider adaptability, and meets expansion needs. On the other hand, the use of a unified control system can realize centralized management and maintenance of the entire energy storage system, simplify maintenance work, and improve the reliability and stability of the energy storage system.

[0020] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0022] Figure 1 A schematic diagram of an exemplary structure of an energy storage system provided in an embodiment of the present disclosure is shown.

[0023] Figure 2 A schematic structural diagram of an energy storage system provided in an embodiment of the present disclosure is shown.

[0024] Figure 3 A communication connection schematic diagram of an energy storage system provided in an embodiment of the present disclosure is shown.

[0025] Figure 4 A schematic structural diagram of another energy storage system provided in an embodiment of the present disclosure is shown.

[0026] Figure 5 A communication connection schematic diagram of another energy storage system provided in an embodiment of the present disclosure is shown.

[0027] Figure 6 A structural schematic diagram of another energy storage system provided in an embodiment of the present disclosure is shown.

[0028] Figure 7 A schematic diagram of the structure of a battery management system in an energy storage subsystem provided in an embodiment of the present disclosure is shown.

[0029] Figure 8 A schematic structural diagram of an electricity consumption system provided in an embodiment of the present disclosure is shown.

[0030] Fig. 9 A flow chart of a control method for an energy storage system provided in an embodiment of the present disclosure is shown.

[0031] Fig.10 A flow chart of another control method for an energy storage system provided in an embodiment of the present disclosure is shown.

[0032] Fig.11 A flow chart of a control method for another energy storage system provided in an embodiment of the present disclosure is shown.

[0033] Fig.12 A flow chart of a control method for another energy storage system provided in an embodiment of the present disclosure is shown.

[0034] Fig.13 A flow chart showing coordinated charge and discharge control of a first battery sub-cluster or a second battery sub-cluster by a first battery management system provided in an embodiment of the present disclosure is shown.

[0035] Fig.14 An example flow chart of a control method for an energy storage system provided in an embodiment of the present disclosure is shown.

[0036] The reference numerals are described as follows:

[0037] 100, energy storage system; 110, energy storage subsystem; 111, battery system; 112, battery management system; 120, energy storage inverter; 130, energy management system; 210, first energy storage subsystem; 211, first battery system; 212, first battery management system; 220, second energy storage subsystem; 221, first battery subcluster; 222, second battery subcluster; 223, second battery management system; 231, first energy storage inverter; 232, second energy storage inverter; 240, switch; 250, third energy storage subsystem; 251, third battery system; 252, third battery management system; 260, switch element; 311, battery cluster; 312, battery module; 313, module battery management unit; 314, cluster battery management unit; 315, system battery management unit; 400, power consumption system; 410, power grid; 420, power grid transformer. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0040] Since the energy people need is highly temporal and spatial, in order to rationally use energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form based on future application needs. At present, the main way to generate green electricity is to develop green energy such as photovoltaics and wind power to replace fossil energy.

[0041] At present, the generation of green electricity generally relies on photovoltaics, wind power, and hydropower, etc. However, wind and solar energy generally have problems of strong intermittency and large volatility, which will cause instability in the power grid, insufficient electricity during peak hours, and too much electricity during valley hours. Unstable voltage will also cause damage to electricity. Therefore, insufficient electricity demand or insufficient grid acceptance capacity may cause the problem of "abandoning wind and solar power". To solve these problems, we must rely on energy storage. That is, converting electrical energy into other forms of energy through physical or chemical means and storing it, and converting energy into electrical energy and releasing it when needed. In simple terms, energy storage is like a large "power bank". When photovoltaic and wind energy are sufficient, electrical energy is stored and the stored electricity is released when needed.

[0042] Taking electrochemical energy storage as an example, the present disclosure provides an energy storage device, which has a group of chemical batteries in it. The chemical elements in the batteries are mainly used as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage media. In simple terms, the electricity generated by wind and solar energy is stored in chemical batteries. When the use of external electricity reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0043] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including energy storage on the power generation side, energy storage on the grid side, and energy storage on the power consumption side. The corresponding types of energy storage devices include:

[0044] (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can help renewable energy generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive regulating power source on the power supply side, energy storage power stations can achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy generation, and are of great significance in power grid system backup, relieving peak load power supply pressure, and peak and frequency regulation.

[0045] (2) Energy storage containers used on the grid side mainly perform peak load regulation, frequency regulation, and grid congestion relief. They can achieve peak load shaving and valley filling of power loads, that is, charging the energy storage batteries when the power load is low and releasing the stored power during the peak load period, thereby achieving a balance between power production and consumption;

[0046] (3) Small energy storage cabinets used on the power consumption side, mainly for self-generation and self-use of electricity, peak-valley price difference arbitrage, capacity cost management and improving power supply reliability. According to different application scenarios, energy storage on the power consumption side can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for valley-peak price difference arbitrage and capacity cost management. In the power market that implements peak-valley electricity prices, by charging the energy storage system at low electricity prices and discharging the energy storage system at high electricity prices, peak-valley electricity price difference arbitrage is achieved to reduce electricity costs. In addition, industrial enterprises that are subject to two-part electricity prices can use energy storage systems to store energy during low electricity consumption and discharge at peak loads, thereby reducing peak power and the maximum demand reported, and achieving the purpose of reducing capacity electricity charges. Household photovoltaic storage can improve the level of self-generation and self-use of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations has been driven. Considering that photovoltaic power is generated during the day, and users generally have higher loads at night, energy storage can be configured to better utilize photovoltaic power, improve the level of self-generation and self-use, and reduce electricity costs. In addition, communication base stations, data centers and other fields need to configure energy storage for backup power.

[0047] like Figure 1 As shown, the energy storage system 100 includes at least one energy storage subsystem 110, each of which is provided with a battery system 111 and a battery management system (BMS) 112. The battery system 111 includes a plurality of battery clusters, each of which includes a plurality of battery modules connected in series and parallel, and each of which includes a plurality of battery cells connected in series and parallel. Figure 1 In the figure, the energy storage system 100 includes p energy storage subsystems 110, and the energy storage subsystem 110 can be a prefabricated cabin. The battery system of each energy storage subsystem 110 includes m battery clusters, each battery cluster includes n battery modules, and each battery module includes q battery cells. It should be noted that p, m, n, and q can be determined according to actual needs.

[0048] The energy storage system 100 further includes an energy management system (EMS) 130 and an energy storage inverter (PCS) 120 .

[0049] The energy management system 130 is used to monitor the performance parameters of the battery system, such as the performance parameters of the battery module, and store the monitored performance parameters of the battery system to a server, such as a cloud server. The battery management system 111 is used to collect the performance parameters of the battery system; the energy storage inverter 120 is used to realize the energy conversion and bidirectional flow between the battery cluster in the energy storage subsystem 110 and the power grid.

[0050] In addition, the energy storage system 100 also includes other auxiliary energy storage devices not shown in the drawings. The auxiliary energy storage devices may include a liquid cooling cabinet, fire fighting equipment, air conditioners, a master control meter, and the like.

[0051] In related technologies, large energy storage products adopt modular design, based on the flexible combination of prefabricated cabins, which can meet energy storage needs of different capacities. For example, a typical 5MWh large-capacity prefabricated cabin can be combined and used in parallel according to the specific requirements of the user to meet different power and capacity requirements. Modular prefabricated cabins can be flexibly deployed and quickly installed on site, significantly shortening the construction period and improving the flexibility of the energy storage system.

[0052] The energy storage system 100 is also highly scalable. Customers can choose a smaller energy storage system capacity during initial deployment. In subsequent use, prefabricated cabins can be added to upgrade the capacity according to actual needs, thereby effectively reducing the customer's initial investment, retaining the possibility of future expansion, and improving the overall competitiveness of the energy storage system 100.

[0053] However, although the energy storage system 100 has advantages such as modular design and scalability, in actual applications, since each prefabricated cabin is controlled by an independent battery management system BMS, there are several significant problems as follows:

[0054] 1. The power of the energy storage inverter 120 cannot match the capacity of the prefabricated cabin. For example, the customer's PCS power is 3.75MW, while the standard prefabricated cabin capacity is 5MWh. When the customer requires a 15MWh system, the use of multiple standard prefabricated cabins alone may result in the power of the energy storage inverter 120 not being perfectly matched with the capacity of the prefabricated cabin, affecting the efficiency of the energy storage system.

[0055] 2. Non-standard product design leads to waste of resources. When customer demand does not match the capacity of standard prefabricated cabins, it can be solved by redesigning or adjusting the prefabricated cabins. However, this solution leads to increased costs and may also lead to waste of resources. The design of non-standard prefabricated cabins also increases the complexity of project execution and reduces production efficiency and product consistency.

[0056] In order to solve at least some of the above technical problems, the present disclosure provides an energy storage system 100 using a battery management system for collaborative control. The energy storage system 100 includes a first energy storage subsystem 210, a second energy storage subsystem 220 and an energy storage inverter 120. The first energy storage subsystem 210 is provided with a first battery system 211 and a first battery management system 212, and the first battery management system 212 is electrically connected to the first battery system 211; the second energy storage subsystem 220 is provided with a second battery system and a second battery management system 223, and the second battery system includes a first battery subcluster 221 and a second battery subcluster 222, and the second battery management system 223 is electrically connected to the first battery subcluster 221 and the second battery subcluster 222, and the second battery management system 223 is communicatively connected to the first battery management system 212; the energy storage inverter 120 is connected to the first battery system 211, and the first battery subcluster 221 or The second battery sub-cluster 222 is electrically connected, and the energy storage inverter 120 is communicatively connected with the first battery management system 212; the first battery management system 212 performs coordinated charging and discharging control on the first battery sub-cluster 221. On the one hand, by segmenting and controlling the second battery system in the second energy storage subsystem 220, the first battery management system 212 performs coordinated charging and discharging control on the battery sub-clusters in the second energy storage subsystem 220. Without changing the original energy storage subsystem control architecture, the number of energy storage inverters 120 is saved, so that the energy storage subsystem meets the requirements of high-power energy storage inverter 120 products, and the energy storage subsystem has a higher matching degree with the energy storage inverter 120, a wider adaptability, and meets expansion needs; on the other hand, the use of a unified control system can realize centralized management and maintenance of the entire energy storage system 100, simplify maintenance work, and improve the reliability and stability of the energy storage system.

[0057] Figure 2 A schematic structural diagram of an energy storage system 100 provided in an embodiment of the present disclosure is shown. Figure 3 FIG. 1 is a schematic diagram showing a communication connection of an energy storage system 100 provided in an embodiment of the present disclosure. Figure 2 and Figure 3As shown, in one embodiment, the energy storage system 100 provided by the embodiment of the present disclosure includes a first energy storage subsystem 210, a second energy storage subsystem 220 and an energy storage inverter 120. The first energy storage subsystem 210 is provided with a first battery system 211 and a first battery management system 212, and the first battery management system 212 is electrically connected to the first battery system 211; the second energy storage subsystem 220 is provided with a second battery system and a second battery management system 223, the second battery system includes a first battery subcluster 221 and a second battery subcluster 222, the second battery management system 223 is electrically connected to the first battery subcluster 221 and the second battery subcluster 222, and the second battery management system 223 is communicatively connected to the first battery management system 212; the energy storage inverter 120 is electrically connected to the first battery system 211, and the first battery subcluster 221 or the second battery subcluster 222, and the energy storage inverter 120 is communicatively connected to the first battery management system 212; the first battery management system 212 performs coordinated charging and discharging control on the first battery subcluster 221.

[0058] It should be noted that the first battery management system 212 can perform coordinated charging and discharging control on the battery sub-cluster electrically connected to the energy storage inverter 120 .

[0059] The energy storage system 100 may include one or more energy storage inverters 120, and each energy storage inverter 120 may be connected to multiple energy storage subsystems. For one energy storage inverter 120, the first energy storage subsystem 210 may be an energy storage subsystem installed when the energy storage inverter 120 is initially installed, or may be called an energy storage subsystem used in the energy storage inverter 120, and the second energy storage subsystem 220 may be an energy storage subsystem added when the energy storage inverter 120 is expanded.

[0060] It should be noted that, for the first battery system 211 and the second battery system, each battery system includes a battery cluster 311 formed by a plurality of battery modules 312 connected in series or parallel, and a battery module 312 may include a plurality of battery cells connected in series or parallel.

[0061] In order to distinguish the battery systems in the first energy storage subsystem 210 and the second energy storage subsystem 220, the battery system in the first energy storage subsystem 210 is defined as the first battery system 211, and the battery system in the second energy storage subsystem 220 is defined as the second battery system, and the second battery system includes the first battery subcluster 221 and the second battery subcluster 222. It should be noted that the number of battery cells in the first battery subcluster 221 and the second battery subcluster 222 can be the same or different, that is, the capacity of the first battery subcluster 221 and the capacity of the second battery subcluster 222 can be the same or different, and the present disclosure does not make specific limitations on this.

[0062] Each energy storage subsystem is equipped with a battery management system, which is mainly composed of detection modules, control modules, communication modules, etc. Its main function is to monitor and control the status of the battery in real time, including but not limited to monitoring and controlling the battery's voltage, current, temperature, state of charge (SOC), state of health (SOH) and other parameters. At the same time, the battery management system can also perform protection control on the battery, such as overcharge, over discharge, over current, etc., to ensure the safety and life of the battery.

[0063] In one embodiment, the battery management system within the first energy storage subsystem 210 is defined as a first battery management system 212. The first battery management system 212 is electrically connected to the first battery system 211. The first battery management system 212 is responsible for independently controlling the first battery system 211, monitoring and managing key parameters such as the charge and discharge status, temperature, and health status of the battery cells within the first energy storage subsystem 210 in real time, and ensuring that the first battery system 211 within the first energy storage subsystem 210 operates in the best state.

[0064] In one embodiment, the battery management system in the second energy storage subsystem 220 is defined as the second battery management system 223, which is electrically connected to the first battery subcluster 221 and the second battery subcluster 222, and the second battery management system 223 and the first battery management system 212 can be connected via Ethernet Internet communication. The second battery management system 223 monitors the key parameters such as the charge and discharge state, temperature, and health status of the first battery subcluster 221 or the second battery subcluster 222 in real time, and sends the collected charge and discharge data of the first battery subcluster 221 or the second battery subcluster 222 to the first battery management system 212, so that the first battery management system 212 can realize the coordinated control of the charge and discharge of the first battery subcluster 221 or the second battery subcluster 222.

[0065] The first energy storage subsystem 210 can be connected to the energy storage inverter 120 through a controller area network (CAN) bus or RS485 serial bus standard. The CAN bus is a serial communication protocol bus for real-time applications. It can use twisted pair cables to transmit signals. It has the widest application range and supports distributed systems, thereby realizing communication between an energy storage inverter 120 and multiple battery management systems, and realizing separate control of multiple energy storage subsystems. RS485 is an electrical standard that can be defined by a user or a general software protocol. The general standard protocols that can use RS-485 as the physical layer include but are not limited to HART bus, Modbus protocol, and Profibus DP protocol.

[0066] In one embodiment, when the energy storage inverter 120 is connected to a first energy storage subsystem 210, and the remaining power of the energy storage inverter 120 is insufficient to support the capacity of a standard energy storage subsystem, a system in which the first battery management system 212 of the first energy storage subsystem 210 disclosed in the present invention is used to coordinately control the battery sub-clusters of the second energy storage subsystem 220 can be used.

[0067] In one embodiment, the high-voltage bus of the energy storage inverter 120 is electrically connected to the first battery system 211 in the first energy storage subsystem 210 and the first battery subcluster 221 or the second battery subcluster 222 in the second energy storage subsystem 220, and the first battery system 211 is used in parallel with the first battery subcluster 221 or the second battery subcluster 222.

[0068] The above-mentioned first battery management system 212 performs coordinated charge and discharge control on the first battery sub-cluster 221 or the second battery sub-cluster 222 electrically connected to the energy storage inverter 120, which means that the second battery management system 223 sends the battery information of the first battery sub-cluster 221 or the second battery sub-cluster 222 to the first battery management system 212, and the first battery management system 212 analyzes and processes the battery information of the first battery system 211 and the battery information of the second battery sub-cluster 222 to obtain the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223, so that the energy storage inverter 120 configures the charge and discharge parameters according to the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223 to obtain the configured charge and discharge parameters, and the first battery management system 212 performs coordinated charge and discharge management on the first battery sub-cluster 221 or the second battery sub-cluster 222 electrically connected to the energy storage inverter 120 according to the configured charge and discharge parameters.

[0069] In the embodiment of the present disclosure, the energy storage system 100 includes a first energy storage subsystem 210, a second energy storage subsystem 220 and an energy storage inverter 120. The first energy storage subsystem 210 is provided with a first battery system 211 and a first battery management system 212, and the first battery management system 212 is electrically connected to the first battery system 211; the second energy storage subsystem 220 is provided with a second battery system and a second battery management system 223, the second battery system includes a first battery subcluster 221 and a second battery subcluster 222, the second battery management system 223 is electrically connected to the first battery subcluster 221 and the second battery subcluster 222, and the second battery management system 223 is communicatively connected to the first battery management system 212; the energy storage inverter 120 is electrically connected to the first battery system 211, and the first battery subcluster 221 or the second battery subcluster 222, and the energy storage inverter The device 120 is communicatively connected with the first battery management system 212; the first battery management system 212 performs coordinated charging and discharging control on the first battery sub-cluster 221. On the one hand, by segmenting and controlling the second battery system in the second energy storage subsystem 220, the first battery management system 212 performs coordinated charging and discharging control on the battery sub-clusters in the second energy storage subsystem 220. Without changing the original energy storage subsystem control architecture, the number of energy storage inverters 120 is saved, so that the energy storage subsystem meets the requirements of high-power energy storage inverters 120 products, and the energy storage subsystem has a higher matching degree with the energy storage inverter 120, a wider adaptability, and meets expansion needs. On the other hand, the use of a unified control system can realize centralized management and maintenance of the entire energy storage system 100, simplify maintenance work, and improve the reliability and stability of the energy storage system.

[0070] Figure 4 A schematic structural diagram of another energy storage system 100 provided in an embodiment of the present disclosure is shown. Figure 5 FIG. 2 shows a communication connection diagram of another energy storage system 100 provided in an embodiment of the present disclosure. Figure 4 and Figure 5As shown, in one embodiment, the energy storage inverter 120 includes a first energy storage inverter 231 and a second energy storage inverter 232; wherein the first energy storage inverter 231 is electrically connected to the first battery system 211 and the first battery sub-cluster 221, and the first energy storage inverter 231 is communicatively connected to the first battery management system 212; the energy storage system also includes a third energy storage subsystem 250, the third energy storage subsystem 250 is provided with a third battery system 251 and a third battery management system 252, the second energy storage inverter 232 is electrically connected to the third battery system 251 and the second battery sub-cluster 222, the second energy storage inverter 232 is communicatively connected to the third battery management system 252, and the third battery management system 252 is communicatively connected to the second battery management system 223; wherein the first battery management system 212 performs charge and discharge coordinated control on the first battery sub-cluster 221; the third battery management system 252 performs charge and discharge coordinated control on the second battery sub-cluster 222.

[0071] The energy storage system 100 may include a plurality of energy storage inverters 120, such as a first energy storage inverter 231 and a second energy storage inverter 232 in the present embodiment, wherein the high-voltage bus of the first energy storage inverter 231 is electrically connected to the first battery system 211 and the first battery sub-cluster 221, and the high-voltage bus of the second energy storage inverter 232 is electrically connected to the third battery system 251 and the second battery sub-cluster 222.

[0072] In one embodiment, the first battery management system 212 is connected to the first energy storage inverter 231 via a CAN bus or RS485 serial bus standard communication; the third battery management system 252 is connected to the second energy storage inverter 232 via a CAN bus or RS486 serial bus standard communication.

[0073] The first battery management system 212, the second battery management system 223 and the third battery management system 252 are connected via Ethernet communication. For example, the first battery management system 212, the second battery management system 223 and the third battery management system 252 are connected to the switch 240 via a local area network LAN to achieve communication connection.

[0074] The first battery management system 212 performs coordinated charging and discharging control on the first battery sub-cluster 221, and the third battery management system 252 performs coordinated charging and discharging control on the second battery sub-cluster 222, which means that the first battery management system 212 or the third battery management system 252 can realize charging and discharging control of the battery system within its own energy storage subsystem, and realize charging and discharging control of the batteries of the corresponding battery sub-cluster in the second energy storage subsystem 220.

[0075] In one embodiment, the first battery management system 212 is used to send a first collaborative control request instruction to the second battery management system 223 when the first battery management system 212 has no faults and is in a standby state;

[0076] The second battery management system 223 is used to receive the first coordinated control request instruction and send the battery information of the first battery sub-cluster 221 to the first battery management system 212 when the second battery management system 223 has no fault and is in a standby state;

[0077] The first battery management system 212 is further used to process the collected battery information of the first battery system 211 and the received battery information of the first battery sub-cluster 221, obtain the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223, and send them to the first energy storage inverter 231;

[0078] The first energy storage inverter 231 is used to configure charging and discharging parameters according to the standby status and charging and discharging data of the first battery management system 212 and the second battery management system 223, and send the charging and discharging parameters to the first battery management system 212, so that the first battery management system 212 can perform coordinated charging and discharging control on the first battery sub-cluster 221 according to the charging and discharging parameters.

[0079] The standby state of the battery management system means that the energy storage subsystem is in a low-power mode, and only the necessary hardware remains powered to save energy. In the standby state, the battery management system powers the core components and only maintains the minimum system working state.

[0080] The first collaborative control request instruction is used to indicate that the first battery management system 212 requests collaborative control from the second battery management system 223. After receiving the first collaborative control request instruction sent by the first battery management system 212, the second battery management system 223 can collect battery information of the first battery sub-cluster 221, including but not limited to the voltage, current, temperature, SOC, etc. of the first battery sub-cluster 221, and send the battery information of the first battery sub-cluster 221 to the first battery management system 212.

[0081] The first battery management system 212 can collect battery information of the first battery system 211 in real time, and analyze and process the battery information of the first battery system 211 and the battery information of the first battery sub-cluster 221, obtain the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223, and send them to the first energy storage inverter 231, wherein the charge and discharge data may include but is not limited to the charge and discharge current, charge and discharge power, etc.

[0082] In one embodiment, the first energy storage inverter 231 determines whether the first battery management system 212 and the second battery management system 223 are in standby state. If so, it determines whether the charging and discharging data meets the preset charging and discharging conditions. If so, it configures the charging and discharging parameters; if not, it waits.

[0083] The above-mentioned charging and discharging data meets the preset charging and discharging conditions, including at least one of the following: the charging power is less than or equal to the preset charging power threshold; the charging current is less than or equal to the preset charging current threshold; the discharging power is greater than or equal to the preset discharging power threshold; the discharging current is greater than or equal to the preset discharging current threshold.

[0084] The charging and discharging parameters may include but are not limited to the charging and discharging current, the charging and discharging power, etc. When the preset charging and discharging conditions are met, the first energy storage inverter 231 configures the charging and discharging parameters and sends the charging and discharging parameters to the first energy storage inverter 231. The first energy storage inverter 231 comprehensively dispatches and optimizes the operating states of the first battery system 211 and the first battery sub-cluster 221 according to the charging and discharging parameters to achieve coordinated control of charging and discharging and ensure coordinated operation between the two.

[0085] In one embodiment, the third battery management system 252 is used to send a second coordinated control request instruction to the second battery management system 223 when the third battery management system 252 has no faults and is in a standby state;

[0086] The second battery management system 223 is used to receive the second coordinated control request instruction and send the battery information of the second battery sub-cluster 222 to the third battery management system 252 when the second battery management system 223 has no fault and is in a standby state;

[0087] The third battery management system 252 is also used to process the collected battery information of the third battery system 251 and the received battery information of the second battery sub-cluster 222, obtain the standby state and charge and discharge data of the third battery management system 252 and the second battery management system 223, and send them to the second energy storage inverter 232;

[0088] The second energy storage inverter 232 is used to configure the charging and discharging parameters according to the standby state and charging and discharging data of the third battery management system 252 and the second battery management system 223, obtain the charging and discharging parameters and send them to the third battery management system 252, so that the third battery management system 252 can perform coordinated charging and discharging control on the second battery sub-cluster 222 according to the charging and discharging parameters.

[0089] It should be noted that the specific implementation of the charge and discharge coordinated control of the second battery sub-cluster 222 by the third battery management system 252 is similar to the specific implementation of the charge and discharge coordinated control of the first battery sub-cluster 221 by the first battery management system 212, which will not be repeated here.

[0090] In the disclosed embodiment, the first battery management system 212 implements coordinated charge and discharge control on the first battery sub-cluster 221 , and the third battery management system 252 implements coordinated charge and discharge control on the second battery sub-cluster 222 , thereby effectively improving the effectiveness and reliability of the energy storage system 100 .

[0091] Figure 6 FIG. 1 is a schematic diagram showing a structure of another energy storage system 100 provided in an embodiment of the present disclosure. Figure 6 As shown, in one embodiment, the first battery sub-cluster 221 and the second battery sub-cluster 222 are electrically connected to the second battery management system 223 via a switch element 260, and the switch element 260 is used to selectively electrically connect the first battery sub-cluster 221 and the second battery sub-cluster 222 to the energy storage inverter 120, so that the first battery management system 212 can perform time-sharing charging and discharging coordinated control on the first battery sub-cluster 221 and the second battery sub-cluster 222.

[0092] It should be noted that the switch element 260 may include a relay, a contactor, an isolating switch, etc., and the present disclosure does not limit this, as long as it can achieve selective electrical connection of the first battery sub-cluster 221 and the second battery sub-cluster 222 to the energy storage inverter 120 .

[0093] In one embodiment, the first battery management system 212 is connected to the energy storage inverter 120 via a CAN bus or RS485 serial bus standard communication connection.

[0094] In one embodiment, the first battery management system 212 is configured to send a third coordinated control request instruction to the second battery management system 223 when the first battery management system 212 is fault-free and in a standby state;

[0095] The second battery management system 223 is used to receive a third coordinated control request instruction when the second battery management system 223 has no faults and is in a standby state, control the switch element 260 to electrically connect the target battery subcluster to the energy storage inverter 120, and send battery information of the target battery subcluster to the first battery management system 212, where the target battery subcluster is the first battery subcluster 221 or the second battery subcluster 222;

[0096] The first battery management system 212 is further used to process the collected battery information of the first battery system 211 and the received battery information of the target battery sub-cluster, obtain the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223, and send them to the energy storage inverter 120;

[0097] The energy storage inverter 120 is used to configure the charging and discharging parameters according to the standby state and charging and discharging data of the first battery management system 212 and the second battery management system 223, and send the charging and discharging parameters to the first battery management system 212, so that the first battery management system 212 can perform coordinated charging and discharging control on the target battery sub-cluster according to the charging and discharging parameters.

[0098] When the second battery management system 223 receives the collaborative control request instruction sent by the first battery management system 212, the second battery management system 223 can determine the target battery cluster 311 according to the battery status of the first battery sub-cluster 221 or the second battery sub-cluster 222, or can alternately electrically connect the first battery sub-cluster 221 or the second battery sub-cluster 222 to the energy storage inverter 120 as the target battery cluster 311, so that the first battery management system 212 performs time-sharing charging and discharging collaborative control on the first battery sub-cluster 221 or the second battery sub-cluster 222 electrically connected to the energy storage inverter 120.

[0099] It should be noted that the specific implementation method of the first battery management system 212 for coordinated charging and discharging control of the target battery sub-cluster is similar to the specific implementation method of the first battery management system 212 for coordinated charging and discharging control of the first battery sub-cluster 221 in the aforementioned embodiment, and the similarities are not repeated here.

[0100] In the disclosed embodiment, the first battery sub-cluster 221 and the second battery sub-cluster 222 are selectively electrically connected to the energy storage inverter 120 through the switch element 260, so that the first battery management system 212 can perform time-sharing charging and discharging coordinated control on the first battery sub-cluster 221 or the second battery sub-cluster 222, thereby improving the scalability of the system.

[0101] In one embodiment, the energy storage system further includes an energy management system 130, and the energy management system 130 is communicatively connected to the first battery management system 212, the second battery management system 223, and the third battery management system 252. When the energy storage system 100 includes multiple energy storage subsystems, the battery management systems in the multiple energy storage subsystems are communicatively connected to the energy management system 130 respectively.

[0102] The first battery management system 212 and the second battery management system 223 are also connected to the energy manager 130 through Ethernet. The first battery management system 212 and the second battery management system 223 are connected to the switch 240 through a local area network (LAN) and connected to the energy management system 130.

[0103] The energy management system 130 is responsible for the control strategy of the energy storage system 100. The control strategy can affect the decay rate and cycle life of the batteries in the system, thereby determining the economic efficiency of the energy storage. In addition, the energy management system 130 can also monitor the faults in the operation of the energy storage system 100, playing a role in timely protecting the equipment and ensuring safety.

[0104] The energy management system 130 generates a control strategy for the energy storage system 100 according to the operating parameters of the battery or the real-time operating parameters of the auxiliary energy storage device, and further controls the operating status of the battery device or the auxiliary energy storage device.

[0105] The energy storage system 100 may also include a plurality of other auxiliary energy storage devices whose operating status needs to be monitored. The above-mentioned devices may include but are not limited to liquid cooling integrated cabinets, fire fighting equipment, air conditioners, master control electric meters, etc. The energy management system 130 may also collect the performance parameters of the above-mentioned auxiliary energy storage devices, so as to achieve efficient utilization and conservation of energy by controlling and adjusting various auxiliary energy storage devices and parameters according to the operating status of the auxiliary energy storage devices and the energy-saving requirements of the system.

[0106] In the disclosed embodiment, the collaboratively controlled battery management system manages the thermal management of each energy storage subsystem in a unified manner through the energy management system 130, ensuring that each energy storage subsystem operates within an appropriate temperature range, avoiding local overheating, and extending the battery life. Through real-time temperature monitoring and intelligent temperature control strategies, the system can automatically adjust the cooling and heating equipment of the energy storage subsystem, optimize temperature management, and improve the operating efficiency and life of the battery. At the same time, the battery management system has detailed diagnostic and alarm functions, which can detect and handle potential problems in a timely manner and reduce the occurrence of failures. The system can automatically generate maintenance reports, provide maintenance suggestions, and help operators perform preventive maintenance.

[0107] Figure 7 FIG. 2 is a schematic diagram showing a battery management system in an energy storage subsystem provided in an embodiment of the present disclosure. Figure 7As shown, each energy storage subsystem is provided with m battery clusters 311, each battery cluster 311 includes n battery modules 312 connected in series, each battery module 312 can be composed of multiple battery cells connected in series and in parallel, and m and n are integers greater than 1. For example, each energy storage subsystem is provided with 10 battery clusters 311, each battery cluster 311 includes 10 battery modules 312 connected in series, and each battery module 312 is composed of 50 battery cells connected in series, that is, each energy storage subsystem is provided with 100 battery modules 312 or 5000 battery cells.

[0108] Each energy storage subsystem includes a system battery management unit (SBMU) 315, n cluster battery management units (CBMU) 314 and m×n module battery management units (MBMU) 313 that are communicatively connected. The system battery management unit 315 is used to manage a corresponding energy storage subsystem, the cluster battery management unit 314 is used to manage a corresponding battery cluster 311; and the module battery management unit 313 is used to manage a corresponding battery module 312.

[0109] like Figure 7 As shown, an energy storage subsystem includes m battery clusters 311, each battery cluster 311 includes n battery modules 312, each battery cluster 311 corresponds to a cluster battery management unit CBMU 314, each battery module 312 corresponds to a module battery management unit MBMU 313, and each module battery management unit 313 is used to collect performance parameters of the corresponding battery module 312. Figure 7In the embodiment, the energy storage subsystem includes m battery clusters 311 and corresponding m cluster battery management units 314, which are CBMU1 to CBMUm respectively; each battery cluster 311 includes n module battery management units 313, which are MBMU1 to MBMUn respectively, MBMU1 corresponds to the first battery module 312, MBMU2 corresponds to the second battery module 312, and MBMUn corresponds to the nth battery module 312. The battery modules 312 are sequentially connected in series to obtain the battery cluster 311. Accordingly, MBMU1, MBMU2, ..., MBMUn communicate serially in sequence, that is, MBMU1 collects the performance parameters of the first battery module 312 and transmits the performance parameters of the first battery pack to MBMU2. After MBMU2 collects the performance parameters of the second battery pack, it transmits the performance parameters of the first battery module 312 and the second battery module 312 to MBMU3, until MBMUn collects the performance parameters of the nth battery module 312 and transmits the performance parameters of the n battery modules 312 in the battery cluster 311 to the cluster battery management unit CBMU. 314. After collecting the performance parameters of the n battery modules 312 in the corresponding battery cluster 311, each cluster battery management unit CBMU transmits the above performance parameters to the SBMU, and the SBMU transmits the performance parameters of the n×m battery modules 312 in the energy storage subsystem to the CBMU.

[0110] The module battery management unit 313 can realize at least one of the cell-level charge balancing in the battery module 312 and the SOX, SOH and SOE at the level of the battery module 312. In some embodiments, the module battery management unit 313 can be called a slave-controlled BMS, a primary BMS, or a battery management module (Battery Management Module, BMM), etc.

[0111] The cluster battery management unit 314 can realize the battery module 312 level power balancing in the battery cluster 311, and at least one of the SOX, SOH and SOE at the battery cluster 311 level. In some embodiments, the cluster battery management unit 314 can also be called a master BMS, a secondary BMS, a cluster control, or a battery control module (Battery Control Module).

[0112] The system battery management unit 315 can realize the battery balancing at the battery cluster 311 level in the energy storage subsystem, and at least one of SOX, SOH and SOE at the energy storage subsystem level. In some embodiments, the system battery management unit 315 can be called display control, three-level BMS, stack control, or energy storage management unit (Energy Storage Management Unit).

[0113] The performance parameters of the battery module 312 may include, but are not limited to, the voltage value, current value, temperature value, state of charge (SOC), state of health (SOH), etc. of the battery module 312 .

[0114] The system battery management unit 315, the cluster battery management unit 314, the module battery management unit 313, etc. of the embodiment of the present application can be an application specific integrated circuit (ASIC), a programmable logic device (PLD), a digital signal processor (DSP) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof, and the embodiment of the present application does not specifically limit this.

[0115] Based on this, the embodiment of the present disclosure also provides a control method for an electric power system 400 and an energy storage system 100, as described in the following embodiments. Since the principle of solving the problem in the embodiment of the system is similar to that in the embodiment of the energy storage system 100, the implementation of the embodiment of the electric power system 400 can refer to the implementation of the embodiment of the energy storage system 100, and the repeated parts will not be repeated.

[0116] Figure 8 FIG. 4 is a schematic diagram showing a structure of a power consumption system 400 provided in an embodiment of the present disclosure. Figure 8 As shown, the embodiment of the present disclosure further provides a power system 400 , which includes the energy storage system 100 in the above embodiment, and the energy storage system 100 is electrically connected to a power grid 410 .

[0117] The energy storage inverter 120 can be connected to the power grid 410 through the power grid transformer 420. The energy storage inverter 120 is mainly composed of an inverter, a transformer, a controller, etc., which converts the electric energy stored in the battery into alternating current to supply the power grid 410 or the power consumption equipment at the user end. The main functions of the energy storage inverter 120 include converting direct current into alternating current, controlling the input or output of electric energy, and ensuring the safety and stability of the energy storage system 100. The performance of the energy storage inverter 120 directly affects the operating efficiency and service life of the energy storage system 100.

[0118] The present disclosure also provides a control method for an energy storage system 100, as described in the following embodiment. Since the principle of solving the problem in the method embodiment is similar to that in the above energy storage system 100 embodiment, the implementation of the method embodiment can refer to the implementation of the above energy storage system 100 embodiment, and the repeated parts will not be repeated.

[0119] Fig. 9 FIG. 1 is a flow chart of a control method of an energy storage system 100 provided in an embodiment of the present disclosure. Fig. 9 As shown, in one embodiment, the control method of the energy storage system 100 of the present disclosure, using the energy storage system 100 in the above embodiment, mainly includes the following steps:

[0120] S902 : Perform charge and discharge coordinated control on the first battery sub-cluster 221 through the first battery management system 212 .

[0121] The first battery management system 212 can perform coordinated charge and discharge control on the first battery sub-cluster 221 or the second battery sub-cluster 222 electrically connected to the energy storage inverter 120. The second battery management system 223 sends the battery information of the first battery sub-cluster 221 or the second battery sub-cluster 222 to the first battery management system 212. The first battery management system 212 analyzes and processes the battery information of the first battery system 211 and the battery information of the first battery sub-cluster 221 or the second battery sub-cluster 222 to obtain the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223, so that the energy storage inverter 120 configures the charge and discharge parameters according to the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223 to obtain the configured charge and discharge parameters. The first battery management system 212 performs coordinated charge and discharge management on the first battery sub-cluster 221 or the second battery sub-cluster 222 electrically connected to the energy storage inverter 120 according to the charge and discharge parameters.

[0122] In the embodiment of the present disclosure, the first battery management system 212 performs coordinated charging and discharging control on the first battery sub-cluster 221. On the one hand, by segmenting and controlling the second battery system in the second energy storage subsystem 220, the first battery management system 212 performs coordinated charging and discharging control on the battery sub-clusters in the second energy storage subsystem 220. Without changing the original energy storage subsystem control architecture, the number of energy storage inverters 120 is saved, so that the energy storage subsystem meets the requirements of high-power energy storage inverter 120 products, and the energy storage subsystem has a higher matching degree with the energy storage inverter 120, a wider adaptability, and meets the expansion requirements. On the other hand, the use of a unified control system can realize centralized management and maintenance of the entire energy storage system 100, simplify maintenance work, and improve the reliability and stability of the energy storage system.

[0123] like Fig.10 As shown, in one embodiment, the energy storage inverter 120 includes a first energy storage inverter 231 and a second energy storage inverter 232; wherein the first energy storage inverter 231 is electrically connected to the first battery system 211 and the first battery sub-cluster 221, and the first energy storage inverter 231 is communicatively connected to the first battery management system 212; the energy storage system also includes a third energy storage subsystem 250, the third energy storage subsystem 250 is provided with a third battery system 251 and a third battery management system 252, the second energy storage inverter 232 is electrically connected to the third battery system 251 and the second battery sub-cluster 222, the second energy storage inverter 232 is communicatively connected to the third battery management system 252, and the third battery management system 252 is communicatively connected to the second battery management system 223; wherein the control method of the energy storage system 100 of the present disclosure also includes:

[0124] S1002 , performing charge and discharge coordinated control on the first battery sub-cluster 221 through the first battery management system 212 ; performing charge and discharge coordinated control on the second battery sub-cluster 222 through the third battery management system 252 .

[0125] like Fig.11 As shown, in one embodiment, the above-mentioned coordinated control of charging and discharging of the first battery sub-cluster 221 by the first battery management system 212 includes:

[0126] S1102: When the first battery management system 212 has no faults and is in a standby state, the first battery management system 212 sends a first coordinated control request instruction to the second battery management system 223;

[0127] S1104: When the second battery management system 223 has no faults and is in a standby state, the second battery management system 223 receives the first coordinated control request instruction and sends the battery information of the first battery sub-cluster 221 to the first battery management system 212;

[0128] S1106: The first battery management system 212 processes the collected battery information of the first battery system 211 and the received battery information of the first battery sub-cluster 221, obtains the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223, and sends them to the first energy storage inverter 231;

[0129] S1108, the first energy storage inverter 231 configures charging and discharging parameters according to the standby states and charging and discharging data of the first battery management system 212 and the second battery management system 223, and sends the charging and discharging parameters to the first battery management system 212;

[0130] S1110 : The first battery management system 212 performs charge and discharge coordinated control on the first battery sub-cluster 221 according to the charge and discharge parameters.

[0131] like Fig.12 As shown, in one embodiment, the above-mentioned coordinated charge and discharge control of the third battery system 251 and the second battery sub-cluster 222 by the third battery management system 252 includes:

[0132] S1202: When the third battery management system 252 has no faults and is in a standby state, the third battery management system 252 sends a second coordinated control request instruction to the second battery management system 223;

[0133] S1204: When the second battery management system 223 has no faults and is in a standby state, the second battery management system 223 receives the second coordinated control request instruction and sends the battery information of the second battery sub-cluster 222 to the third battery management system 252;

[0134] S1206: The third battery management system 252 processes the collected battery information of the third battery system 251 and the received battery information of the second battery sub-cluster 222, obtains the standby state and charge and discharge data of the third battery management system 252 and the second battery management system 223, and sends them to the second energy storage inverter 232;

[0135] S1208, the second energy storage inverter 232 configures charging and discharging parameters according to the standby state and charging and discharging data of the third battery management system 252 and the second battery management system 223, and sends the charging and discharging parameters to the third battery management system 252;

[0136] S1210 : The third battery management system 252 performs charge and discharge coordinated control on the second battery sub-cluster 222 according to the charge and discharge parameters.

[0137] like Fig.13 As shown, in one embodiment, the above-mentioned coordinated control of charging and discharging of the first battery sub-cluster 221 by the first battery management system 212 includes:

[0138] S1310: When the first battery management system 212 has no faults and is in a standby state, the first battery management system 212 sends a third coordinated control request instruction to the second battery management system 223;

[0139] S1320: When the second battery management system 223 has no faults and is in a standby state, the second battery management system 223 receives the third coordinated control request instruction, controls the switch element 260 to electrically connect the target battery subcluster to the energy storage inverter 120, and sends battery information of the target battery subcluster to the first battery management system 212, where the target battery subcluster is the first battery subcluster 221 or the second battery subcluster 222;

[0140] S1330: The first battery management system 212 processes the collected battery information of the first battery system 211 and the received battery information of the target battery sub-cluster, obtains the standby state and charge and discharge data of the first battery management system 212 and the second battery management system 223, and sends them to the energy storage inverter 120;

[0141] S1340, the energy storage inverter 120 configures charging and discharging parameters according to the standby states and charging and discharging data of the first battery management system 212 and the second battery management system 223, and sends the charging and discharging parameters to the first battery management system 212;

[0142] S1350: The first battery management system 212 performs charge and discharge coordinated control on the target battery sub-cluster according to the charge and discharge parameters.

[0143] In order to deepen the understanding of the control method of the preset energy storage system disclosed in the present invention, the following is combined with the attached Fig.14 In this example, the energy storage system 100 includes a first energy storage inverter PCS1, a second energy storage inverter PCS2, a first energy storage subsystem, a second energy storage subsystem and a third energy storage subsystem, the first energy storage subsystem includes an electrically connected first battery system and a first battery management system BMS1, the second energy storage subsystem includes an electrically connected second battery system (the second battery system includes a first battery subcluster and a second battery subcluster) and a second battery management system BMS2, the first battery subcluster, the second battery subcluster and the second battery management system BMS2 are electrically connected, the third energy storage subsystem includes an electrically connected third battery system and a third battery management system BMS3, the first battery management system BMS1 is communicatively connected to PCS1, the third battery management system BMS3 is communicatively connected to PCS2, and BMS1, BMS2 and BMS3 are communicatively connected via Ethernet.

[0144] like Fig.14 As shown, in one embodiment, the control method of the energy storage system 100 disclosed in the present invention mainly includes the following aspects:

[0145] The BMS1 in the first energy storage subsystem 210 independently controls the first battery system 211: BMS1 is responsible for independently controlling the first battery system 211, monitoring and managing key parameters such as the charge and discharge status, temperature, and health status of the batteries in the first energy storage subsystem 210 in real time, and ensuring that the first battery system 211 of the first energy storage subsystem 210 operates in the best state.

[0146] The BMS3 in the third energy storage subsystem 250 independently controls the third battery system 251: BMS3 is responsible for independently controlling the third battery system 251, monitoring and managing key parameters such as the charge and discharge status, temperature, and health status of the batteries in the third energy storage subsystem 250 in real time, and ensuring that the third battery system 251 of the third energy storage subsystem 250 operates in the best state.

[0147] The BMS2 of the second energy storage subsystem 220 performs charge and discharge coordinated control with the BMS1 of the first energy storage subsystem 210, specifically including the following operations:

[0148] The BMS2 of the second energy storage subsystem 220 is responsible for monitoring the battery information of the first battery subcluster 221 and the second battery subcluster 222 in the second energy storage subsystem 220;

[0149] The BMS1 of the first energy storage subsystem 210 is responsible for monitoring the battery information of the first battery system 211 in the first energy storage subsystem 210;

[0150] When BMS1 of the first energy storage subsystem 210 has no faults and is in a standby state, BMS1 sends a collaborative control request instruction to BMS2;

[0151] If BMS2 receives the collaborative control request instruction sent by BMS1, BMS2 sends the battery information of the first battery sub-cluster 221 to BMS1, including but not limited to voltage, current, temperature, SOC, etc.; if BMS2 does not receive the collaborative control request instruction sent by BMS1, it performs a patrol query;

[0152] When BMS2 receives the battery information of the first battery sub-cluster 221, BMS1 analyzes the battery information of the first battery sub-cluster 221 and the first battery system 211, obtains the operating status and charge and discharge data of BMS1 and BMS2, and sends the standby status and charge and discharge data of BMS1 and BMS2 to PCS1;

[0153] PCS1 determines whether the standby status and charge and discharge data of BMS1 and BMS2 meet the preset charge and discharge conditions. If not, PCS1 waits for the standby status and charge and discharge data of BMS1 and BMS2 to meet the preset charge and discharge conditions. If they meet, PCS1 configures the charge and discharge parameters and sends the configured charge and discharge parameters to BMS1.

[0154] The BMS1 comprehensively schedules and optimizes the operating states of the first battery system 211 and the first battery sub-cluster 221 according to the configured charging and discharging parameters to ensure coordinated operation of the first battery system 211 and the first battery sub-cluster 221 .

[0155] The charge and discharge coordination control of the BMS3 of the third energy storage subsystem 250 and the BMS2 of the second energy storage subsystem 220 is specifically performed as follows:

[0156] The BMS2 of the second energy storage subsystem 220 is responsible for monitoring the battery information of the first battery subcluster 221 and the second battery subcluster 222 in the second energy storage subsystem 220;

[0157] The BMS3 of the third energy storage subsystem 250 is responsible for monitoring the battery information of the third battery system 251 in the third energy storage subsystem 250;

[0158] When the BMS3 of the third energy storage subsystem 250 has no faults and is in a standby state, the BMS3 sends a collaborative control request instruction to the BMS2;

[0159] If BMS2 receives the collaborative control request instruction sent by BMS3, BMS2 sends the battery information of the second battery sub-cluster 222 to BMS3, including but not limited to voltage, current, temperature, SOC, etc.; if BMS2 does not receive the collaborative control request instruction sent by BMS3, BMS3 performs patrol query;

[0160] After receiving the battery information of the second battery sub-cluster 222, BMS3 analyzes the battery information of the second battery sub-cluster 222 and the third battery system 251, obtains the standby status and charge and discharge data of BMS3 and BMS2, and sends the standby status and charge and discharge data of BMS3 and BMS2 to PCS1;

[0161] PCS2 determines whether the preset charging and discharging conditions are met based on the standby status and charging and discharging data of BMS3 and BMS2. If not, PCS2 waits for the operating status and charging and discharging data of BMS3 to meet the preset charging and discharging conditions. If so, PCS3 configures the charging and discharging parameters and sends the configured charging and discharging parameters to BMS3.

[0162] The BMS3 comprehensively schedules and optimizes the operating states of the third battery system 251 and the second battery sub-cluster 222 according to the configured charging and discharging parameters to ensure coordinated operation of the third battery system 251 and the second battery sub-cluster 222 .

[0163] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0164] In addition, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0165] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0166] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. An energy storage system, characterized in that: include: A first energy storage subsystem, wherein the first energy storage subsystem is provided with a first battery system and a first battery management system, and the first battery management system is electrically connected to the first battery system; A second energy storage subsystem, wherein the second energy storage subsystem is provided with a second battery system and a second battery management system, the second battery system includes a first battery subcluster and a second battery subcluster, the second battery management system is electrically connected to the first battery subcluster and the second battery subcluster, and the second battery management system is communicatively connected to the first battery management system; An energy storage inverter, the energy storage inverter being electrically connected to the first battery system and the first battery sub-cluster or the second battery sub-cluster, and the energy storage inverter being communicatively connected to the first battery management system; The first battery management system performs coordinated charging and discharging control on the first battery sub-cluster.

2. The energy storage system according to claim 1, characterized in that: The energy storage inverter includes a first energy storage inverter and a second energy storage inverter; wherein the first energy storage inverter is electrically connected to the first battery system and the first battery sub-cluster, and the first energy storage inverter is communicatively connected to the first battery management system; The energy storage system further includes a third energy storage subsystem, wherein the third energy storage subsystem is provided with a third battery system and a third battery management system, the second energy storage inverter is electrically connected to the third battery system and the second battery sub-cluster, and the third battery management system is communicatively connected to the second battery management system; Wherein, the first battery management system performs coordinated charge and discharge control on the first battery sub-cluster; The third battery management system performs coordinated charge and discharge control on the second battery sub-cluster.

3. The energy storage system according to claim 2, characterized in that: The first battery management system is configured to send a first collaborative control request instruction to the second battery management system when the first battery management system has no faults and is in a standby state; The second battery management system is configured to receive the first coordinated control request instruction and send the battery information of the first battery sub-cluster to the first battery management system when the second battery management system has no faults and is in a standby state; The first battery management system is further used to process the collected battery information of the first battery system and the received battery information of the first battery sub-cluster, obtain the standby state and charge and discharge data of the first battery management system and the second battery management system, and send them to the first energy storage inverter; The first energy storage inverter is used to configure charging and discharging parameters according to the standby status and charging and discharging data of the first battery management system and the second battery management system, and send the charging and discharging parameters to the first battery management system, so that the first battery management system can perform coordinated charging and discharging control on the first battery sub-cluster according to the charging and discharging parameters.

4. The energy storage system according to claim 2, characterized in that: The third battery management system is used to send a second coordinated control request instruction to the second battery management system when the third battery management system has no faults and is in a standby state; The second battery management system is configured to receive the second coordinated control request instruction and send the battery information of the second battery sub-cluster to the third battery management system when the second battery management system has no faults and is in a standby state; The third battery management system is further used to process the collected battery information of the third battery system and the received battery information of the second battery sub-cluster, obtain the standby state and charge and discharge data of the third battery management system and the second battery management system, and send them to the second energy storage inverter; The second energy storage inverter is used to configure charging and discharging parameters according to the standby state and charging and discharging data of the third battery management system and the second battery management system, and send the charging and discharging parameters to the third battery management system so that the third battery management system can perform coordinated charging and discharging control on the second battery sub-cluster according to the charging and discharging parameters.

5. The energy storage system according to claim 1, characterized in that: The first battery sub-cluster and the second battery sub-cluster are electrically connected to the second battery management system via a switching element, and the switching element is used to selectively electrically connect the first battery sub-cluster and the second battery sub-cluster to the energy storage inverter so that the first battery management system can perform time-sharing charging and discharging coordinated control on the first battery sub-cluster and the second battery sub-cluster.

6. The energy storage system according to claim 5, characterized in that: The first battery management system is configured to send a third collaborative control request instruction to the second battery management system when the first battery management system has no faults and is in a standby state; The second battery management system is used to receive the third coordinated control request instruction when the second battery management system has no faults and is in a standby state, control the switch element to electrically connect the target battery subcluster to the energy storage inverter, and send battery information of the target battery subcluster to the first battery management system, where the target battery subcluster is the first battery subcluster or the second battery subcluster; The first battery management system is further used to process the collected battery information of the first battery system and the received battery information of the target battery sub-cluster, obtain the standby state and charge and discharge data of the first battery management system and the second battery management system, and send them to the energy storage inverter; The energy storage inverter is used to configure charging and discharging parameters according to the standby status and charging and discharging data of the first battery management system and the second battery management system, and send the charging and discharging parameters to the first battery management system, so that the first battery management system can perform coordinated charging and discharging control on the target battery sub-cluster according to the charging and discharging parameters.

7. The energy storage system according to any one of claims 2 to 4, characterized in that: The energy storage system also includes an energy management system, which is communicatively connected with the first battery management system, the second battery management system, and the third battery management system.

8. A control method for an energy storage system, characterized in that: Using the energy storage system as claimed in claim 1, the method comprises: The first battery management system performs coordinated charging and discharging control on the first battery sub-cluster.

9. The control method of the energy storage system according to claim 8, characterized in that: The energy storage inverter includes a first energy storage inverter and a second energy storage inverter; wherein the first energy storage inverter is electrically connected to the first battery system and the first battery sub-cluster, and the first energy storage inverter is communicatively connected to the first battery management system; The energy storage system further includes a third energy storage subsystem, wherein the third energy storage subsystem is provided with a third battery system and a third battery management system, the second energy storage inverter is electrically connected to the third battery system and the second battery sub-cluster, and the third battery management system is communicatively connected to the second battery management system; Wherein, the method further comprises: Performing coordinated charging and discharging control on the first battery sub-cluster through the first battery management system; The third battery management system performs coordinated charging and discharging control on the second battery sub-cluster.

10. The control method of the energy storage system according to claim 9, characterized in that: The performing coordinated charging and discharging control on the first battery sub-cluster by the first battery management system includes: When the first battery management system has no faults and is in a standby state, the first battery management system sends a first collaborative control request instruction to the second battery management system; When the second battery management system has no faults and is in a standby state, the second battery management system receives the first coordinated control request instruction and sends battery information of the first battery sub-cluster to the first battery management system; The first battery management system processes the collected battery information of the first battery system and the received battery information of the first battery sub-cluster, obtains the standby state and charge and discharge data of the first battery management system and the second battery management system, and sends the data to the first energy storage inverter; The first energy storage inverter configures charging and discharging parameters according to the standby states and charging and discharging data of the first battery management system and the second battery management system, and sends the charging and discharging parameters to the first battery management system; The first battery management system performs coordinated charging and discharging control on the first battery sub-cluster according to the charging and discharging parameters.

11. The control method of the energy storage system according to claim 9, characterized in that: The performing charge and discharge coordinated control on the second battery sub-cluster by the third battery management system includes: When the third battery management system has no faults and is in a standby state, the third battery management system sends a second coordinated control request instruction to the second battery management system; When the second battery management system has no faults and is in a standby state, the second battery management system receives the second coordinated control request instruction and sends the battery information of the second battery sub-cluster to the third battery management system; The third battery management system processes the collected battery information of the third battery system and the received battery information of the second battery sub-cluster, obtains the standby state and charge and discharge data of the third battery management system and the second battery management system, and sends the data to the second energy storage inverter; The second energy storage inverter configures charging and discharging parameters according to the standby state and charging and discharging data of the third battery management system and the second battery management system, and sends the charging and discharging parameters to the third battery management system; The third battery management system performs coordinated charge and discharge control on the second battery sub-cluster according to the charge and discharge parameters.

12. The control method of the energy storage system according to claim 8, characterized in that: The first battery sub-cluster and the second battery sub-cluster are electrically connected to the energy storage inverter through a switch element, and the switch element is used to selectively electrically connect the first battery sub-cluster and the second battery sub-cluster to the energy storage inverter, so that the first battery management system performs time-sharing charging and discharging coordinated control on the first battery sub-cluster and the second battery sub-cluster; The step of controlling the charging and discharging coordination of the first battery sub-cluster by using the first battery management system includes: When the first battery management system has no faults and is in a standby state, the first battery management system sends a third collaborative control request instruction to the second battery management system; When the second battery management system has no faults and is in a standby state, the second battery management system receives the third coordinated control request instruction, controls the switch element to electrically connect the target battery sub-cluster to the energy storage inverter, and sends battery information of the target battery sub-cluster to the first battery management system, where the target battery sub-cluster is the first battery sub-cluster or the second battery sub-cluster; The first battery management system processes the collected battery information of the first battery system and the received battery information of the target battery sub-cluster, obtains the standby state and charge and discharge data of the first battery management system and the second battery management system, and sends the data to the energy storage inverter; The energy storage inverter configures charging and discharging parameters according to the standby states and charging and discharging data of the first battery management system and the second battery management system, and sends the charging and discharging parameters to the first battery management system; The first battery management system performs coordinated charging and discharging control on the target battery sub-cluster according to the charging and discharging parameters.

13. An electricity system, characterized in that: include: The energy storage system according to any one of claims 1 to 7, wherein the energy storage system is electrically connected to a power grid.

Images