Energy storage system and control method thereof

Abstract

The invention relates to an energy storage system and a control method of the energy storage system, and the energy storage system comprises an energy management system and a plurality of energy storage devices. Each energy storage device comprises a main control module and an energy processing module; the main control modules in the energy storage devices are connected in sequence; the energy management system is connected with the main control module of the energy storage device located at the starting end in the energy storage devices and connected with the main control module of the energy storage device located at the tail end in the energy storage devices; in each energy storage device, the main control module is connected with the energy processing module and used for responding to communication interruption between the energy management system and the main control module and controlling the operation state of the energy processing module based on a local operation strategy pre-stored in the main control module. Through the application, the problems that the energy storage system cannot be flexibly expanded, the expansibility is seriously limited, and the continuously increasing energy storage demand is difficult to effectively meet are solved, and the expansibility of the energy storage system is improved to meet the increasing energy storage demand.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to an energy storage system and a control method for the energy storage system. Background Art

[0002] With the growth of global energy demand and the rapid development of renewable energy, energy storage technology has become an important means to solve the balance between power supply and demand, improve the dispatching ability of the power system, and enhance power supply reliability. In existing energy storage systems, each energy storage device requires an independent energy management system to monitor and control the operating status of the system, resulting in the inability of the energy storage system to be flexibly expanded, with severely limited scalability. Therefore, when facing scenarios such as the expansion of the scale of renewable energy grid connection, the increasing demand for power peak shaving and valley filling, and the sharp increase in the demand for emergency and standby power supplies, it is difficult to effectively meet the growing energy storage demand.

[0003] Regarding the problem in the related technology that the energy storage system cannot be flexibly expanded, has severely limited scalability, and is difficult to effectively meet the growing energy storage demand, no effective solution has been proposed yet. Summary of the Invention

[0004] In this embodiment, an energy storage system and a control method for the energy storage system are provided to solve the problem in the related technology that the energy storage system cannot be flexibly expanded, has severely limited scalability, and is difficult to effectively meet the growing energy storage demand.

[0005] In the first aspect, in this embodiment, an energy storage system is provided. The system includes an energy management system and a plurality of energy storage devices; wherein, each energy storage device includes a main control module and an energy processing module; the main control modules in each energy storage device are connected in sequence;

[0006] The energy management system is connected to the main control module of the energy storage device at the beginning among each energy storage device, and is also connected to the main control module of the energy storage device at the end among each energy storage device;

[0007] In each energy storage device, the main control module is connected to the energy processing module, and is configured to control the operating status of the energy processing module based on the locally stored operating strategy in the main control module in response to the communication interruption between the energy management system and the main control module.

[0008] In some of the embodiments, the energy processing module includes a battery cluster management unit, a battery cluster, and an energy storage converter;

[0009] The battery cluster management unit is respectively connected to the main control module and the energy storage converter, and is configured to manage the battery cluster and transmit the status information of the battery cluster to the energy storage converter;

[0010] The energy storage converter is connected to the master control module and the battery cluster, and is configured to convert the direct current output by the battery cluster into alternating current, or convert the received alternating current into direct current and then transmit it to the battery cluster.

[0011] In some embodiments, the energy storage device further includes a high-voltage control box for collecting the state information of the battery cluster;

[0012] The energy storage converter is connected to the battery cluster through the high-voltage control box.

[0013] In some embodiments, the system further includes a power grid and / or a load;

[0014] The energy storage converter is connected to the power grid and / or the load.

[0015] In some embodiments, the energy storage device further includes a dynamic environment monitoring module;

[0016] The dynamic environment monitoring module is communicatively connected to the master control module and is configured to monitor the internal state of the energy storage device in real time.

[0017] In some embodiments, the dynamic environment monitoring module includes at least one of a fire protection unit, a liquid cooling unit, and a temperature control unit.

[0018] In some embodiments, the master control module is a smart communication manager.

[0019] In a second aspect, a control method for an energy storage system is provided in this embodiment. The method is applicable to the energy storage system described in the first aspect above. The method includes:

[0020] In response to a communication interruption between the energy management system and the master control module in any energy storage device, based on the local operation strategy pre-stored in the master control module, control the operation state of the energy processing module in the energy storage device.

[0021] In some embodiments, the method further includes:

[0022] In response to a connection interruption between the battery cluster management unit in the energy storage device and the energy storage converter, transmit the scheduling instruction issued by the energy management system to the energy storage converter through the master control module.

[0023] In some embodiments, the energy management system is configured to detect whether a battery cluster in each energy storage device fails. The method further includes:

[0024] When it is detected that the battery cluster in the energy storage device fails, disconnect the battery cluster.

[0025] Compared with the related art, a energy storage system and a control method thereof provided in this embodiment. The energy storage system includes an energy management system and a plurality of energy storage devices; wherein, each energy storage device includes a main control module and an energy processing module; the main control modules in each energy storage device are connected in sequence; the energy management system is connected to the main control module of the energy storage device at the beginning and the main control module of the energy storage device at the end among each energy storage device; in each energy storage device, the main control module is connected to the energy processing module, and is used to respond to the communication interruption between the energy management system and the main control module, and based on the locally stored operation strategy in the main control module, control the operation state of the energy processing module, solving the problem that the energy storage system cannot be flexibly expanded, the scalability is severely limited, and it is difficult to effectively meet the growing energy storage demand, and realizing the improvement of the scalability of the energy storage system to meet the growing energy storage demand.

[0026] Details of one or more embodiments of the present application are set forth in the following drawings and description, so that other features, objects, and advantages of the present application will become more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0028] Figure 1 is a structural block diagram of an energy storage system provided by an embodiment of the present application;

[0029] Figure 2 is a structural block diagram of an energy processing module provided by an embodiment of the present application;

[0030] Figure 3 is a structural block diagram of an energy storage device provided by an embodiment of the present application;

[0031] Figure 4 is a structural block diagram of an energy storage device provided by another embodiment of the present application;

[0032] Figure 5 is a structural block diagram of an energy storage system provided by a preferred embodiment of the present application;

[0033] Figure 6 is a flowchart of a control method of an energy storage system provided by an embodiment of the present application.

[0034] In the figure: 100, energy management system; 200, energy storage device; 210, main control module; 220, energy processing module; 221, battery cluster management unit; 222, battery cluster; 223, energy storage converter; 224, high-voltage control box; 230, dynamic environment monitoring module. Detailed implementation manners

[0035] To understand the purpose, technical solution and advantages of the present application more clearly, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments.

[0036] Unless otherwise defined, the technical terms or scientific terms involved in the present application shall have the general meanings understood by those with ordinary skills in the technical field to which the present application belongs. In the present application, words such as "a", "one", "a kind of", "the", "these" and the like do not indicate a limitation in quantity, and they can be singular or plural. The terms "including", "comprising", "having" and any variants thereof involved in the present application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent in these processes, methods, products or devices. The terms "connected", "coupled" and the like involved in the present application do not limit to physical or mechanical connections, but may include electrical connections, whether directly or indirectly connected. The "multiple" involved in the present application means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" may mean: A exists alone, A and B exist simultaneously, and B exists alone. Usually, the character " / " indicates that the objects associated before and after are in an "or" relationship. The terms "first", "second", "third" and the like involved in the present application only distinguish similar objects and do not represent a specific sorting of the objects.

[0037] In this embodiment, an energy storage system is provided. Figure 1 is the structural block diagram of the energy storage system in this embodiment, as Figure 1 shown. The system includes an energy management system 100 and multiple energy storage devices 200; among them, each energy storage device 200 includes a main control module 210 and an energy processing module 220; the main control modules 210 in each energy storage device 200 are connected in sequence.

[0038] The energy management system 100 is connected to the main control module 210 of the energy storage device 200 at the beginning among each energy storage device 200, and is connected to the main control module 210 of the energy storage device 200 at the end among each energy storage device 200.

[0039] In each energy storage device 200, the main control module 210 is connected to the energy processing module 220, and is configured to control the operating state of the energy processing module 220 based on the locally stored operation strategy in the main control module 210 in response to the communication interruption between the energy management system 100 and the main control module 210.

[0040] In this embodiment, the energy storage system includes an energy management system 100 (Energy Management System, EMS) and multiple energy storage devices 200. Each energy storage device 200 includes a main control module 210 and an energy processing module 220. The energy processing module 220 includes a battery cluster management unit 221 (Battery Cluster Management Unit, BCMU), a battery cluster 222, and a power conversion system 223 (Power Conversion System, PCS). The main control module 210 in each energy storage device 200 is connected to the energy processing module 220, and the main control modules 210 in each energy storage device 200 are connected in sequence.

[0041] Specifically, the energy management system 100 is the highest-level control unit of the entire energy storage system, and is connected to the main control module 210 of the energy storage device 200 at the beginning and the main control module 210 of the energy storage device 200 at the end in each energy storage device 200, and is configured to monitor and control the operating state of the entire energy storage system. Based on this, the energy storage devices 200 at the head and the tail in the energy storage system communicate with the energy management system 100 respectively to form a communication loop. When any node in the communication link of the energy storage device 200 fails, it does not affect the communication of the overall system. This communication connection method not only saves communication cables, but also only requires a small number of communication network ports of the energy management system 100, significantly reducing the equipment cost.

[0042] Furthermore, the main control modules 210 in each energy storage device 200 are connected in sequence, and the scheduling instructions issued by the energy management system 100 can reach each energy storage device 200. For example, the energy management system 100 issues charge and discharge control instructions to instruct the energy storage converter 223 to charge the battery cluster 222 with a constant current, or issues grid connection / off-grid switching instructions according to the grid status connected to the system. Among them, the main control module 210 is the local control unit of the energy storage device 200, usually using a Smart Communication Manager (SCM), which is responsible for monitoring and controlling the operating status of a single energy storage device 200. When the energy storage device 200 is disconnected from the upper computer control, it can monitor and control the energy storage device 200 to ensure the normal operation of the energy storage device 200. At the same time, as a communication transfer station, it can promptly respond to the scheduling instructions issued by the energy management system 100 and upload the status and related information of the energy storage device 200 itself to the energy management system 100. In addition, it can also implement functions such as automatic address allocation, adding new energy storage units, and replacing local control units, without manual intervention in address allocation, improving the reliability of the system. When the communication between the energy management system 100 and the main control module 210 in the current energy storage device 200 is interrupted, based on the locally stored operation strategy in the main control module 210, the operating status of the energy processing module 220 is controlled to ensure the normal operation of the energy storage device 200. At the same time, when any main control module 210 is interrupted in communication with the energy management system 100, it will not affect the normal operation of other energy storage devices 200 in the system, ensuring the safe and reliable operation of the energy storage system. Among them, the locally stored operation strategy includes power value setting and power limitation during the charge and discharge process, over-temperature and over-voltage protection strategies, and charge state control strategies of the energy storage device 200, etc.

[0043] In each energy storage device 200, the main control module 210, the battery cluster management unit 221, and the energy storage converter 223 establish communication with each other in pairs. The battery cluster management unit 221 and the battery cluster 222 establish communication. The battery cluster management unit 221 can transmit some data information to the energy storage converter 223 to timely control the operation and shutdown of the energy storage converter 223, without passing information through the main control module 210, thereby reducing the transmission link and shortening the transmission time, effectively improving the system response speed. In addition, when the energy management system 100 issues a scheduling instruction, if any communication connected to the energy storage converter 223 is interrupted, other communication links can be selected to implement the instruction issuance to ensure the stability of the communication of the energy storage converter 223. For example, in the case of communication interruption between the battery cluster management unit 221 and the energy storage converter 223, the scheduling instruction can be sent to the energy storage converter 223 through the main control module 210.

[0044] It should be noted that the energy storage device 200 in this embodiment can also operate independently. In this case, the energy storage system includes an energy management system 100 and a single energy storage device 200. Each energy storage device 200 includes a main control module 210, a battery cluster management unit 221, a battery cluster 222, and an energy storage converter 223. The main control module 210 is connected to the energy management system 100, and communication is established between the main control module 210, the battery cluster management unit 221, and the energy storage converter 223 in pairs, and communication is established between the battery cluster management unit 221 and the battery cluster 222. When the communication between the energy management system 100 and the main control module 210 is interrupted, in the same way as the operation mode of multiple energy storage devices 200, based on the local operation strategy pre-stored in the main control module 210, the operation state inside the energy storage device 200 is controlled, improving the flexibility of the energy storage system and adapting to diverse scenarios.

[0045] In the existing energy storage system, each energy storage device requires an independent energy management system to monitor and control the operation state of the system, resulting in the inability to flexibly expand the energy storage system, and the scalability is severely limited. Therefore, when facing scenarios such as the expansion of the scale of renewable energy grid connection, the increasing demand for power peak shaving and valley filling, and the surging demand for emergency and standby power supplies, it is difficult to effectively meet the growing energy storage demand.

[0046] Compared with the prior art, in this application, the energy storage system includes an energy management system 100 and multiple energy storage devices 200; among them, each energy storage device 200 includes a main control module 210 and an energy processing module 220; the main control modules 210 in each energy storage device 200 are connected in sequence; the energy management system 100 is connected to the main control module 210 of the energy storage device 200 at the beginning and the main control module 210 of the energy storage device 200 at the end in each energy storage device 200; in each energy storage device 200, the main control module 210 is connected to the energy processing module 220, and is used to control the operation state of the energy processing module 220 based on the local operation strategy pre-stored in the main control module 210 in response to the interruption of communication between the energy management system 100 and the main control module 210. Based on this, by setting an energy management system 100 and multiple energy storage devices 200 in the energy storage system, the main control module 210 in each energy storage device 200 serves as a local control unit, and the main control modules 210 in each energy storage device 200 are connected in sequence. Therefore, only one energy management system 100 needs to be configured. When the communication between any main control module 210 and the energy management system 100 is interrupted, the corresponding energy storage device 200 can control the operation state of the energy processing module 220 through the main control module 210 serving as the local control unit, realizing system expansion on the premise of ensuring system stability, solving the problems that the energy storage system cannot be flexibly expanded, the scalability is severely limited, and it is difficult to effectively meet the growing energy storage demand, and realizing the improvement of the scalability of the energy storage system on the premise of ensuring system stability to meet the growing energy storage demand.

[0047] In some of these embodiments, as Figure 2 shown, the energy processing module 220 includes a battery cluster management unit 221, a battery cluster 222, and an energy storage converter 223;

[0048] The battery cluster management unit 221 is respectively connected to the main control module 210, the battery cluster 222, and the energy storage converter 223, and is used to manage the battery cluster 222 and transmit the status information of the battery cluster 222 to the energy storage converter 223;

[0049] The energy storage converter 223 is connected to the main control module 210 and is also connected to the battery cluster 222, and is used to convert the direct current output by the battery cluster 222 into alternating current, or convert the received alternating current into direct current and then transmit it to the battery cluster 222.

[0050] In this embodiment, the energy processing module 220 includes a battery cluster management unit 221, a battery cluster 222, and an energy storage converter 223. The main control module 210 is connected to the energy management system 100, and communication is established pairwise between the main control module 210, the battery cluster management unit 221, and the energy storage converter 223, and communication is established between the battery cluster management unit 221 and the battery cluster 222. Among them, the communication between the energy storage converter 223 and the main control module 210 can be implemented through the RS485 interface.

[0051] The battery cluster management unit 221 is used to manage the battery cluster 222 and transmit the status information of the battery cluster 222 to the energy storage converter 223. Specifically, it is responsible for voltage acquisition and current acquisition of the battery cluster 222, summarizing the voltage and temperature information of the single cells within the cluster, calculating the state of charge and health state of the battery cluster 222, performing functions such as balancing strategy judgment and battery fault diagnosis, and implementing functions such as local protection and relay control of the battery cluster 222 according to battery fault information. The battery cluster 222 in each energy storage device 200 operates as an independent unit and is uniformly scheduled by the energy management system 100 to achieve one-cluster-one-management. When a fault occurs in the battery cluster 222 in any energy storage device 200, the energy management system 100 will disconnect the battery cluster 222 to ensure the normal operation of the system. And the energy storage converter 223 is used to convert the direct current output by the battery cluster 222 into alternating current that meets the grid standard or load demand, or convert the received alternating current into direct current and then transmit it to the battery cluster 222, and the battery cluster 222 receives and stores the electric energy. The energy storage converter 223 can also flexibly control the charge and discharge power of the battery cluster 222 according to system requirements such as scheduling instructions, and supply power to AC loads in the absence of a power grid, etc.

[0052] In this embodiment, a battery cluster management unit 221, a battery cluster 222, and an energy storage converter 223 are provided in the energy processing module 220. The battery cluster management unit 221 is respectively connected to the main control module 210, the battery cluster 222, and the energy storage converter 223, and is used to manage the battery cluster 222 and transmit the status information of the battery cluster 222 to the energy storage converter 223. The energy storage converter 223 is connected to the main control module 210 and the battery cluster 222, and is used to convert the direct current output by the battery cluster 222 into alternating current, or convert the received alternating current into direct current and then transmit it to the battery cluster 222, so as to realize the management of energy storage and release.

[0053] In some of these embodiments, as Figure 3 shown, the energy storage device 200 further includes a high-voltage control box 224;

[0054] The energy storage converter 223 is connected to the battery cluster 222 through the high-voltage control box 224.

[0055] Specifically, the energy storage device 200 further includes a high-voltage control box 224 (High Voltage control, HVC). The high-voltage control box 224 is a management unit for the high-voltage power circuit of the energy storage system and serves as an intermediate unit connecting the energy storage converter 223 and the battery cluster 222 in the system to realize status signal transmission, overvoltage and overcurrent protection, charge and discharge control, etc. For example, the status signals (such as voltage, current, and temperature, etc.) of the battery cluster 222 are transmitted to the energy storage converter 223, so that the energy storage converter 223 can adjust the working mode in real time according to the received signals of the battery cluster 222.

[0056] It should be noted that the battery cluster management unit 221 is used to manage the battery cluster 222 in the energy storage system and is usually placed in the high-voltage control box 224, while the high-voltage control box 224 is used to collect the battery cluster voltage and battery cluster current, and control and protect the battery cluster circuit contactor, etc.

[0057] In this embodiment, the energy storage converter 223 is connected to the battery cluster 222 through the high-voltage control box 224, so as to realize safety protection, battery cluster status monitoring, energy control, etc.

[0058] In some of these embodiments, the above energy storage system further includes a power grid and / or a load;

[0059] The energy storage converter 223 is connected to the power grid and / or the load.

[0060] Specifically, there is a two-way energy flow between the energy storage device 200 and the power grid. When the energy storage converter 223 is connected to the power grid, the energy storage converter 223 can rectify the alternating current of the power grid into direct current to charge the energy storage device 200, or invert the direct current in the energy storage device 200 into alternating current to transmit electric energy to the power grid to adapt to different scenarios.

[0061] There is a one-way energy flow between the energy storage device 200 and the load. When the energy storage converter 223 is connected to the load, the energy storage converter 223 inverts the direct current in the energy storage device 200 into the alternating current required by the load to supply power to the load. Among them, for different types of loads (such as resistive, inductive or capacitive loads), the energy storage converter 223 will adaptively adjust the output parameters.

[0062] Through this embodiment, the energy storage converter 223 is connected to the power grid and / or the load to achieve the charge and discharge function with the power grid and the power supply function with the load.

[0063] In some of these embodiments, as Figure 4 shown, the energy storage device 200 further includes a dynamic environment monitoring module 230;

[0064] The dynamic environment monitoring module 230 is communicatively connected to the main control module 210 and is used to monitor the internal state of the energy storage device 200 in real time.

[0065] In this embodiment, the energy storage device 200 further includes a dynamic environment monitoring (Environmental monitoring, EM) module. The dynamic environment monitoring module 230 is a bridge for the battery cluster management unit 221 to interact with the internal environment of the energy storage device 200, and is used to monitor the environmental temperature inside the energy storage device 200 and abnormal states such as smoke, and can timely handle the abnormal states inside the device, and upload the monitoring results to the energy management system 100 through the main control module 210.

[0066] Specifically, the dynamic environment monitoring module 230 increases the temperature and humidity inside the energy storage device 200, detects combustible gases, controls the cooling fan or air conditioner, and adjusts the speed of the fan by pulse width modulation according to the internal requirements of the energy storage device 200 to improve the safety and stability of the system.

[0067] Through this embodiment, the energy storage device 200 further includes a dynamic environment monitoring module 230 for monitoring the internal state of the energy storage device 200 in real time to ensure the safe operation of the system.

[0068] In some of these embodiments, the dynamic environment monitoring module 230 includes at least one of a fire protection unit, a liquid cooling unit, and a temperature control unit.

[0069] Specifically, the dynamic environment monitoring module 230 includes a fire protection unit, a liquid cooling unit, and a temperature control unit, all of which are communicatively connected to the main control module 210. Among them, the fire protection unit is used for detecting combustible gases, open flames, etc. inside the energy storage device 200. When the detected concentration of combustible gases reaches the set alarm threshold, an alarm is triggered, or the ventilation system inside the energy storage device 200 is controlled according to the concentration of combustible gases. At the same time, when an open flame is detected, the fire protection unit can quickly activate the fire extinguishing mechanism to prevent the expansion of electrical fires.

[0070] The liquid cooling unit is used to monitor the temperature of the battery cells inside the battery cluster 222. When the detected temperature of the battery cells rises close to the warning threshold, the flow rate of the coolant can be adjusted by controlling the pump speed of the liquid cooling unit, or a refrigeration device is equipped in the liquid cooling unit. When the temperature of the battery cells is too high and the temperature cannot be effectively reduced by increasing the flow rate, the refrigeration device can be activated to reduce the temperature of the coolant to achieve temperature control. The temperature control unit is used to monitor the temperature data inside the energy storage device 200, including the temperature information at different positions inside the energy storage device 200, such as the temperature around the energy storage converter 223 and the cooling system components. The transmission frequency of the data is usually determined by preset parameters. For example, during normal operation of the device, the temperature data is transmitted every few seconds or minutes, and during abnormal temperature fluctuations, the transmission frequency is increased to obtain the latest temperature information in a timely manner.

[0071] Through this embodiment, the dynamic environment monitoring module 230 is provided with at least one of a fire protection unit, a liquid cooling unit, and a temperature control unit to improve the safety of the system.

[0072] The following describes and illustrates this embodiment through preferred embodiments.

[0073] Figure 5 is the structural block diagram of the energy storage system of this preferred embodiment, as Figure 5 shown, the energy storage system includes an energy management system 100 and multiple energy storage devices 200; among them, each energy storage device 200 includes a main control module 210, an energy processing module 220, and a dynamic environment monitoring module 230. The main control module 210 uses a smart communication manager; the energy processing module 220 includes a battery cluster management unit 221, a battery cluster 222, and an energy storage converter 223. The main control module 210, the battery cluster management unit 221, and the energy storage converter 223 establish communication with each other in pairs, and the battery cluster management unit 221 and the battery cluster 222 establish communication; the main control modules 210 in each energy storage device 200 are connected in sequence.

[0074] Specifically, the energy management system 100 is the highest-level control unit of the entire energy storage system. It is connected to the main control modules 210 of the energy storage devices 200 at the beginning and the main control modules 210 of the energy storage devices 200 at the end among all the energy storage devices 200, and is used to monitor and control the operating status of the entire energy storage system. The main control modules 210 in each energy storage device 200 are connected in sequence, and the scheduling instructions issued by the energy management system 100 can reach each energy storage device 200.

[0075] The main control module 210 is the local control unit of the energy storage device 200, and is responsible for monitoring and controlling the operating status of a single energy storage device 200. For example, when the energy storage device 200 is disconnected from the upper computer control, it can monitor and control the energy storage device 200 to ensure the normal operation of the energy storage device 200; the main control module 210, as a communication transfer station, can promptly respond to the scheduling instructions issued by the energy management system 100; and upload the status and relevant information of the energy storage device 200 itself to the energy management system 100. Among them, when the communication between the energy management system 100 and the main control module 210 in the current energy storage device 200 is interrupted, based on the locally stored operation strategy in the main control module 210, the operating status of the energy processing module 220 is controlled to ensure the normal operation of the energy storage device 200. At the same time, when the communication between any main control module 210 and the energy management system 100 is interrupted, it will not affect the normal operation of other energy storage devices 200 in the system, ensuring the safe and reliable operation of the energy storage system. The locally stored operation strategy includes power value setting and power limitation during the charge and discharge process, over-temperature and over-voltage protection strategies, state of charge control strategies of the energy storage device 200, etc.

[0076] The above-mentioned battery cluster management unit 221 is usually placed in the high-voltage control box 224, and is used to manage the battery cluster 222 and transmit the status information of the battery cluster 222 to the energy storage converter 223. Specifically, it is responsible for voltage acquisition and current acquisition of the battery cluster 222, summarizing the voltage and temperature information of the single cells in the cluster, calculating the state of charge and health state of the battery cluster 222, performing equalization strategy judgment and battery fault diagnosis functions, and realizing functions such as local protection and relay control of the battery cluster 222 according to the battery fault information. Among them, the high-voltage control box 224 is used to acquire the battery cluster voltage and battery cluster current, and control and protect the battery cluster loop contactor.

[0077] The DC side of the energy storage converter 223 is connected to the high-voltage control box 224, and the AC side is connected to the battery cluster management unit 221 and the AC bus. It is used to convert the DC power output by the battery cluster 222 into AC power that meets the grid standards or load requirements, or convert the received AC power into DC power and then transmit it to the battery cluster 222. The battery cluster 222 receives and stores the electrical energy. The energy storage converter 223 can also flexibly control the charging and discharging power of the battery cluster 222 according to system requirements such as dispatching instructions, and supply power to AC loads in the absence of a power grid, etc.

[0078] In addition, the dynamic environment monitoring module 230 includes a fire protection unit, a liquid cooling unit, and a temperature control unit. The fire protection unit, the liquid cooling unit, and the temperature control unit are all communicatively connected to the main control module 210. The fire protection unit is used for detecting combustible gases, open flames, etc. inside the energy storage device 200; the liquid cooling unit is used for monitoring the temperature of the battery cells inside the battery cluster 222. When it is detected that the temperature of the battery cells rises close to the warning threshold, the flow rate of the coolant can be adjusted by controlling the pump speed of the liquid cooling unit. The temperature control unit is used for monitoring the temperature data inside the energy storage device 200, and the temperature data includes the temperature information at different positions inside the energy storage device 200, such as the temperature around the energy storage converter 223 and the positions of the cooling system components, etc.

[0079] Through this embodiment, the main control module 210 in each energy storage device 200 serves as a local control unit, and the main control modules 210 in each energy storage device 200 are connected in sequence. When the communication between any main control module 210 and the energy management system 100 is interrupted, the corresponding energy storage device 200 can control the operating state of the energy processing module 220 through the main control module 210 serving as the local control unit, so as to realize system expansion on the premise of ensuring system stability, solve the problem that the energy storage system cannot be flexibly expanded, the scalability is severely limited, and it is difficult to effectively meet the growing energy storage demand, and realize the improvement of the scalability of the energy storage system on the premise of ensuring system stability to meet the growing energy storage demand.

[0080] In this embodiment, a control method for an energy storage system is also provided. Figure 6 It is a flowchart of the control method for the energy storage system of this embodiment, as Figure 6 shown. This process includes the following steps:

[0081] Step S610, in response to the communication interruption between the energy management system and the main control module in any energy storage device, based on the locally stored operation strategy in the main control module, control the operating state of the energy processing module in the energy storage device.

[0082] Specifically, the energy storage system includes an energy management system and multiple energy storage devices. Each energy storage device includes a main control module and an energy processing module, and the main control modules in each energy storage device are connected in sequence. Among them, the energy management system is the highest-level control unit of the entire energy storage system, connected to the main control module of the energy storage device at the beginning and the main control module of the energy storage device at the end in each energy storage device, and is used to monitor and control the operating state of the entire energy storage system. The main control module is the local control unit of the energy storage device, usually using a smart communication manager, responsible for monitoring and controlling the operating state of a single energy storage device. When the energy storage device is disconnected from the upper computer control, it can monitor and control the energy storage device to ensure its normal operation. At the same time, as a communication transfer station, it can promptly respond to the scheduling instructions issued by the energy management system and upload the status and related information of the energy storage device itself to the energy management system.

[0083] In each energy storage device, the energy processing module includes a battery cluster management unit, a battery cluster, and an energy storage inverter. Communication is established pairwise between the main control module, the battery cluster management unit, and the energy storage inverter, and communication is established between the battery cluster management unit and the battery cluster. When the communication between the energy management system and the main control module in any energy storage device is interrupted, based on the locally stored operation strategy in the main control module, the operating states of components such as the battery cluster management unit, the battery cluster, and the energy storage inverter are controlled to ensure the normal operation of the energy storage device. At the same time, when the communication between any main control module and the energy management system is interrupted, it will not affect the normal operation of other energy storage devices in the system, ensuring the safe and reliable operation of the energy storage system. Among them, the locally stored operation strategy includes power value setting and power limitation during the charge and discharge process, over-temperature and over-voltage protection strategies, charge state control strategies of the energy storage device, etc.

[0084] It should be noted that the control of the energy storage system includes the control methods associated with the energy storage system in the above system embodiments and preferred embodiments, which will not be elaborated here.

[0085] Through this embodiment, in response to the communication interruption between the energy management system and the main control module in any energy storage device, based on the locally stored operation strategy in the main control module, the operating state of the energy processing module in the energy storage device is controlled, improving the safety and reliability of the operation of the energy storage system, and ensuring the stability of the system while realizing system expansion.

[0086] In some of these embodiments, the control method of the above energy storage system further includes the following steps:

[0087] In response to the connection interruption between the battery cluster management unit and the energy storage inverter in the energy storage device, the scheduling instruction issued by the energy management system is transmitted to the energy storage inverter through the main control module.

[0088] Specifically, in each energy storage device, the master control module, the battery cluster management unit, the battery cluster, and the energy storage converter establish communication with each other in pairs. The battery cluster management unit can transmit some data information to the energy storage converter to timely control the operation and shutdown of the energy storage converter, without the need to transmit information through the master control module, thereby reducing the transmission link, shortening the transmission time, and effectively improving the system response speed.

[0089] When the energy management system issues a scheduling instruction, if any communication connected to the energy storage converter is interrupted, other communication links can be selected to implement the instruction issuance to ensure the stability of the energy storage converter communication. For example, in the case of communication interruption between the battery cluster management unit and the energy storage converter, the scheduling instruction can be sent to the energy storage converter through the master control module.

[0090] Through this embodiment, in response to the connection interruption between the battery cluster management unit and the energy storage converter in the energy storage device, the scheduling instruction issued by the energy management system is transmitted to the energy storage converter through the master control module to ensure the normal and stable operation of the system.

[0091] In some of these embodiments, the energy management system is used to detect whether a battery cluster in each energy storage device fails; the control method of the above energy storage system further includes the following steps:

[0092] When it is detected that the battery cluster in the energy storage device fails, the battery cluster is disconnected.

[0093] Specifically, the battery cluster in each energy storage device operates as an independent unit and is uniformly scheduled by the energy management system to achieve one-cluster-one-management. When it is detected that the battery cluster in any energy storage device fails, the energy management system will disconnect the battery cluster to ensure the normal operation of the system. After the battery cluster is disconnected, the master control module starts the internal in-depth fault diagnosis program to collect real-time voltage, current, temperature and other data of the battery cluster, and compares and analyzes the collected data with the historical data and the standard parameters during normal operation to analyze and obtain the cause of the fault.

[0094] In addition, after the battery cluster is disconnected, the charge and discharge power of each normal battery cluster can be readjusted according to the capacity, state of charge of other normal battery clusters and the current power demand of the system to maintain the overall power output of the system.

[0095] Through the embodiment, by detecting whether the battery cluster in each energy storage device fails, and when it is detected that the battery cluster in the energy storage device fails, disconnecting the battery cluster to ensure the normal operation of the system and improve the system reliability.

[0096] It should be noted that the steps shown in the above process or the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0097] It should be understood that the specific embodiments described herein are only used to explain this application and not to limit it. According to the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0098] Obviously, the accompanying drawings are only some examples or embodiments of the present application. For those of ordinary skill in the art, the present application can also be applied to other similar situations based on these drawings without creative efforts. Additionally, it can be understood that although the work done during the development process here may be complex and time-consuming, for those of ordinary skill in the art, certain design, manufacturing, or production changes based on the technical content disclosed in the present application are only conventional technical means and should not be regarded as insufficient disclosure of the present application.

[0099] The term "embodiment" in the present application means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification and does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. Those of ordinary skill in the art can clearly or implicitly understand that the embodiments described in the present application can be combined with other embodiments without conflict.

[0100] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of patent protection. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An energy storage system, characterized in that: The system comprises an energy management system (100) and a plurality of energy storage devices (200); wherein each of the energy storage devices (200) comprises a main control module (210) and an energy processing module (220); and the main control modules 210 in each of the energy storage devices (200) are connected in sequence; The energy management system 100 is connected to the main control module (210) of the energy storage device (200) located at the beginning among the energy storage devices (200), and is connected to the main control module (210) of the energy storage device (200) located at the end among the energy storage devices (200); In each of the energy storage devices (200), the main control module (210) is connected to the energy processing module (220) and is used to control the operating state of the energy processing module (220) based on a local operating strategy pre-stored in the main control module (210) in response to a communication interruption between the energy management system (100) and the main control module (210).

2. The energy storage system according to claim 1, characterized in that: The energy processing module (220) comprises a battery cluster management unit (221), a battery cluster (222) and an energy storage converter (223); The battery cluster management unit (221) is connected to the main control module (210) and the energy storage converter (223) respectively, and is used to manage the battery cluster (222) and transmit the status information of the battery cluster (222) to the energy storage converter (223); The energy storage converter (223) is connected to the main control module (210) and to the battery cluster (222), and is used to convert direct current output by the battery cluster (222) into alternating current, or to convert received alternating current into direct current and transmit the converted alternating current to the battery cluster (222).

3. The energy storage system according to claim 2, characterized in that: The energy storage device (200) further includes a high-voltage control box (224) for collecting status information of the battery cluster (222); The energy storage converter (223) is connected to the battery cluster (222) via the high-voltage control box (224).

4. The energy storage system according to claim 2, characterized in that: The system also includes a power grid and / or a load; The energy storage converter (223) is connected to the power grid and / or the load.

5. The energy storage system according to claim 1, characterized in that: The energy storage device (200) further includes a dynamic environment monitoring module (230); The dynamic environment monitoring module (230) is communicatively connected to the main control module (210) and is used to monitor the internal state of the energy storage device in real time.

6. The energy storage system according to claim 5, characterized in that: The dynamic environment monitoring module (230) comprises at least one of a fire protection unit, a liquid cooling unit and a temperature control unit.

7. The energy storage system according to claim 1, characterized in that: The main control module (210) is an intelligent communication manager.

8. A control method for an energy storage system, characterized in that: The method is applicable to the energy storage system according to any one of claims 1 to 7; the method comprises: In response to the interruption of communication between the energy management system and a main control module in any energy storage device, the operating state of the energy processing module in the energy storage device is controlled based on the local operating strategy pre-stored in the main control module.

9. The control method of the energy storage system according to claim 8, characterized in that: The method further comprises: In response to the battery cluster management unit in the energy storage device being disconnected from the energy storage converter, the scheduling instruction issued by the energy management system is transmitted to the energy storage converter via the main control module.

10. The control method of the energy storage system according to claim 8, characterized in that: The energy management system is used to detect whether a battery cluster in each of the energy storage devices fails; the method further includes: When a failure of the battery cluster in the energy storage device is detected, the battery cluster is switched off.

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