Energy storage control system and energy storage control method

Abstract

The application provides an energy storage control system and an energy storage control method. The energy storage control system comprises an energy management system and at least one energy storage converter group. Each energy storage converter group comprises a first energy storage converter and at least one second energy storage converter. The energy management system is configured to determine first transmission data of each energy storage converter group and send the first transmission data to each first energy storage converter. The first energy storage converter is configured to process the received first transmission data to obtain second transmission data corresponding to each energy storage converter in the energy storage converter group, and send the second transmission data to each second energy storage converter in the energy storage converter group. The second energy storage converter is configured to perform a corresponding response operation according to the data corresponding to the second energy storage converter in the received second transmission data. The application directly controls the first energy storage converter through the energy management system, thereby improving the response performance of the entire energy storage system.

Description

Technical Field

[0001] This application relates to the field of energy storage control system technology, and in particular to energy storage control systems and energy storage control methods. Background Technology

[0002] With the widespread application of renewable energy and the increasing demand for energy management, energy storage systems have become an important component of modern power systems. Energy storage systems balance power supply and demand by storing electrical energy and providing energy during peak demand periods, thereby improving system stability and reliability.

[0003] The data response and execution processes of related energy storage systems are quite complex, affecting the system's response and execution speed. This impact is particularly pronounced when the entire energy storage system is sufficiently complex and large. Summary of the Invention

[0004] The purpose of this application is to provide an energy storage control system and an energy storage control method to improve the response speed and execution speed of the energy storage system.

[0005] The objective of this application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide an energy storage control system, the energy storage control system including an energy management system and at least one energy storage converter group, each energy storage converter group including a first energy storage converter and at least one second energy storage converter; the energy management system is used to determine first transmission data for each energy storage converter group, and to send the first transmission data of each energy storage converter group to the first energy storage converter in the corresponding energy storage converter group; the first energy storage converter is used to process the received first transmission data to obtain second transmission data corresponding to each energy storage converter in its energy storage converter group, and to send the second transmission data to each second energy storage converter in its energy storage converter group; the second energy storage converter is used to perform a corresponding response operation based on the data corresponding to the second energy storage converter in the received second transmission data.

[0007] In some embodiments, the energy management system connects to at least one first energy storage converter in at least one energy storage converter group via at least one first communication line, so that the energy management system sends first transmission data of the corresponding energy storage converter group to the first energy storage converter in the corresponding energy storage converter group via each first communication line; each energy storage converter in the energy storage converter group is connected via a second communication line, so that the first energy storage converter sends the second transmission data to each second energy storage converter in its energy storage converter group via the second communication line.

[0008] In some embodiments, the first communication line uses the GOOSE protocol, and the second communication line uses the CAN protocol.

[0009] In some embodiments, each energy storage converter in the energy storage converter group is further connected via a third communication line, so that the first energy storage converter can send the second transmission data to each second energy storage converter in the energy storage converter group via the third communication line.

[0010] In some embodiments, the third communication line uses the Modbus TCP protocol.

[0011] In some embodiments, the first energy storage converter includes a first controller and a first actuator connected in communication, and the second energy storage converter includes a second actuator; the first controller is used to process the received first transmission data to obtain second transmission data corresponding to each energy storage converter in the energy storage converter group, and the first actuator is used to send the second transmission data to the second actuator of each second energy storage converter in the energy storage converter group.

[0012] In some embodiments, the energy storage control system further includes an energy management unit corresponding to each energy storage converter group; the energy management unit is communicatively connected to the energy management system, and the energy management unit is also communicatively connected to each energy storage converter in the corresponding energy storage converter group, and the energy management unit is used to transmit third transmission data between the energy management system and each energy storage converter in the corresponding energy storage converter group.

[0013] In some embodiments, the priority of the third transmitted data is lower than the priority of the first transmitted data.

[0014] In some embodiments, the first transmitted data includes power scheduling parameters of the corresponding energy storage converter group, and the second transmitted data includes power scheduling parameters of each energy storage converter in the corresponding energy storage converter group.

[0015] Secondly, embodiments of this application provide an energy storage control method, applied to any of the aforementioned energy storage control systems. The method includes: an energy management system determining first transmission data for each energy storage converter group; and sending the first transmission data of each energy storage converter group to a first energy storage converter in the corresponding energy storage converter group; the first energy storage converter processing the received first transmission data to obtain second transmission data corresponding to each energy storage converter in its energy storage converter group; and sending the second transmission data to each second energy storage converter in its energy storage converter group; and the second energy storage converter performing a corresponding response operation based on the data corresponding to the second energy storage converter in the received second transmission data.

[0016] This application provides an energy storage control system and an energy storage control method. The energy storage control system includes an energy management system and at least one energy storage converter group. Each energy storage converter group includes a first energy storage converter and at least one second energy storage converter. The energy management system is used to determine first transmission data for each energy storage converter group and to send the first transmission data of each energy storage converter group to the first energy storage converter in the corresponding energy storage converter group. The first energy storage converter is used to process the received first transmission data to obtain second transmission data corresponding to each energy storage converter in its energy storage converter group and to send the second transmission data to each second energy storage converter in its energy storage converter group. The second energy storage converter is used to perform a corresponding response operation based on the data corresponding to the second energy storage converter in the received second transmission data. The first transmission data provided by the energy management system is directly sent to the first energy storage converter of each energy storage converter group. The first energy storage converter processes the first transmission data and sends the processed second transmission data to the corresponding second energy storage converter, reducing data forwarding layers and improving data transmission efficiency. Secondly, the first energy storage converter can handle some data processing operations, effectively utilizing its computing resources and reducing the computational load on the energy management system, thus lowering its burden. In this embodiment, the energy management system directly controls the first energy storage converter, improving data transmission efficiency and rationally utilizing computing resources. This enhances the response and execution speed of the energy storage system, thereby improving the overall response performance of the system. Attached Figure Description

[0017] This application will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a logic block diagram of an energy storage power station system responding to power dispatch instructions, provided in an embodiment of this application.

[0019] Figure 2 This is a structural block diagram of an energy storage control system provided in an embodiment of this application.

[0020] Figure 3 This is a structural block diagram of a first energy storage converter provided in an embodiment of this application.

[0021] Figure 4 This is a structural block diagram of a second energy storage converter provided in an embodiment of this application.

[0022] Figure 5 This is a logic block diagram of another energy storage power station system responding to power dispatch instructions provided in the embodiments of this application.

[0023] Figure 6This is a flowchart illustrating an energy storage control method provided in an embodiment of this application. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of the embodiments of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In large-scale energy storage systems with numerous PCS (Power Conversion Systems) (e.g., energy storage power station systems), the EMS (Energy Management System) is limited by its own hardware and software resources, making it difficult to communicate directly with each PCS. Therefore, an LC (Local Controller, acting as an energy management unit at the subsystem level, such as a battery pack) is needed to forward data and achieve hierarchical communication management for transmitting different types of data, such as control parameters and operational status data. As an example, an EMS can be connected to one or more LCs, and each LC can be connected to one or more PCSs.

[0027] In practical applications, the Energy Storage System (EMS) can respond to control commands and execute corresponding management operations. Control commands may include, for example, scheduling commands. Control parameters can be determined based on these commands, and the transmission speed of these parameters throughout the communication link will affect the energy storage system's response performance. Particularly for control parameters requiring rapid response, such as power scheduling parameters, the response and execution of their related scheduling commands (i.e., power scheduling commands) are crucial for the energy storage system. The following section uses power scheduling commands as an example of control commands to illustrate the response process.

[0028] See Figure 1 , Figure 1 This is a logic block diagram of an energy storage power station system responding to power dispatching commands, provided in an embodiment of this application. Figure 1In the diagram, dashed lines represent data transmission paths. An energy storage power station system includes an EMS, a switch, multiple LCs (e.g., LC1 to LCn), multiple PCSs (e.g., PCS1 to PCS3), multiple BMUs (Battery Management Units), and multiple battery cells, where n is, for example, a positive integer. The EMS can be connected to multiple LCs via a switch. PCSs can include, for example, an ARM (Advanced RISC Machine), a CMU (Cluster Management Unit), and a DSP (Digital Signal Processor). The ARM can have, for example, a BLE (Bluetooth Low Energy) communication interface, an RS485 (Recommended Standard 485) communication interface, and a NET (Network) communication interface (e.g., an Ethernet communication interface). The LCs and their connected PCSs can form an Ethernet ring network based on the Modbus TCP (Modbus Transmission Control Protocol) protocol. Within a PCS, the ARM processors can be connected to the CMU and DSP via different CAN (Controller Area Network) lines. The CMU, for example, can be connected to the battery cell via the BMU. CMUs in different PCS connected to the same LC can also be connected to the LC via a CAN bus. DSPs in different PCS connected to the same LC can be connected via a CAN bus for multi-machine parallel synchronous communication.

[0029] like Figure 1 As shown, in response to power dispatch commands (e.g., grid power dispatch commands), the EMS performs power allocation calculations to derive power dispatch parameters corresponding to each PCS. The EMS sends the power dispatch parameters of each PCS mounted on the LC to the LC via the GOOSE protocol. The LC converts the GOOSE protocol power dispatch parameters into Modbus TCP protocol power dispatch parameters and then transmits them to each mounted PCS via an Ethernet ring network. After receiving the power dispatch parameters, each PCS sends them to the DSP via its internal ARM. The DSP, as the final execution terminal, executes the corresponding operation based on the power dispatch parameters, such as a power dispatch operation.

[0030] As can be seen from the above response process of power dispatch commands, the entire response and execution process is quite cumbersome, involving not only multiple control units (e.g., EMS, LC, and ARM) but also protocol conversion. These factors affect the execution speed of power dispatch commands to some extent. When the entire energy storage power station system is sufficiently complex and large, the impact will be even more pronounced.

[0031] See Figure 2 , Figure 2 This is a structural block diagram of an energy storage control system provided in an embodiment of this application. Figure 2 In the diagram, dashed lines represent data transmission paths. PCS1, which can communicate directly with EMS, can be considered the PCS master, while PCS2 and PCS3, which cannot communicate directly with EMS, can be considered the PCS slaves.

[0032] To address the slow response and execution speed issues of energy storage systems, this application provides an energy storage control system. The control system includes an energy management system and at least one energy storage converter group. Each energy storage converter group includes a first energy storage converter and at least one second energy storage converter. The energy management system determines first transmission data for each energy storage converter group and sends the first transmission data of each energy storage converter group to the first energy storage converter in the corresponding energy storage converter group. The first energy storage converter processes the received first transmission data to obtain second transmission data corresponding to each energy storage converter in its energy storage converter group, and sends the second transmission data to each second energy storage converter in its energy storage converter group. The second energy storage converter performs a corresponding response operation based on the data corresponding to the second energy storage converter in the received second transmission data.

[0033] In the above embodiments, the number of energy storage converter groups can be one or more. Each energy storage converter group includes at least two energy storage converters, namely, a first energy storage converter and at least one second energy storage converter. The first energy storage converter (e.g., PCS1) that can directly communicate with the energy management system can be considered the PCS master, and the second energy storage converters (e.g., PCS2 and PCS3) that cannot directly communicate with the energy management system can be considered PCS slaves. The above embodiments do not limit the method of determining the first energy storage converter from the energy storage converter group; it can be selected or set according to actual needs. As an example, an energy storage converter is randomly selected from the energy storage converter group as the first energy storage converter. As another example, the energy storage converter with the best computing resources is determined from the energy storage converter group as the first energy storage converter.

[0034] The above embodiments improve the response and execution speed of the entire energy storage system to control commands with high real-time requirements by directly controlling the first energy storage converter in each energy storage converter group through the energy management system, thereby improving the overall response performance of the energy storage system. Specifically, the energy management system and the first energy storage converter can communicate directly, sending the first transmission data directly to the first energy storage converter in each energy storage converter group. The first energy storage converter processes the first transmission data and sends the processed second transmission data to the corresponding second energy storage converter. Thus, the LC in the relevant communication scheme (i.e., EMS-LC-PCS) is omitted, reducing the forwarding layers of LC and the corresponding protocol conversion steps, which can improve data transmission efficiency compared to the scheme of forwarding data through LC. Secondly, the first energy storage converter can handle some data processing operations (i.e., process the first transmission data of the energy storage converter group to obtain the second transmission data corresponding to each energy storage converter), concentrating some calculations within the energy storage converter group (e.g., power allocation calculations) on the corresponding first energy storage converter (i.e., the PCS host). This effectively utilizes the computing resources of the first energy storage converter, reduces the computational load on the energy management system, and lowers its burden. Through improved data transmission efficiency and rational use of computing resources, the response and execution speed of the energy storage system can be significantly improved.

[0035] It is important to note that the first transmitted data corresponds to the energy storage converter group (not to a single energy storage converter), while the second transmitted data corresponds to each energy storage converter in the energy storage converter group (not just the corresponding data of a single energy storage converter). The above embodiments do not limit the first and second transmitted data. To improve the response and execution speed of the energy storage system to control commands with high real-time requirements, the first transmitted data may, for example, include control parameters of the energy storage converter group. The second transmitted data is obtained by processing the first transmitted data by the first energy storage converter, and the second transmitted data may, for example, include control parameters of each energy storage converter in the corresponding energy storage converter group. These control parameters may include one or more of power scheduling parameters, voltage parameters, and current parameters.

[0036] The above embodiments do not limit the response operation. In some embodiments, the second energy storage converter performs a data-related response operation based on the data corresponding to the second energy storage converter in the received second transmission data. This response operation may include power scheduling operation, voltage regulation operation, frequency regulation operation, etc. on the DC side of the second energy storage converter.

[0037] To improve the response and execution speed of power dispatch commands, in some embodiments, the first transmitted data may include power dispatch parameters of the corresponding energy storage converter group, and the second transmitted data may include power dispatch parameters of each energy storage converter in the corresponding energy storage converter group. In the above embodiments, the energy management system performs power control on each energy storage converter group (which can be regarded as a primary power allocation) and communicates directly with the first energy storage converter in each energy storage converter group, providing the power dispatch parameters of the energy storage converter group to which the first energy storage converter belongs to the first energy storage converter. The first energy storage converter is responsible for power allocation within its energy storage converter group. It performs power allocation (which can be considered a secondary power allocation) among the energy storage converters in the group, deriving the power scheduling parameters for each energy storage converter (including the first and second energy storage converters). Each power scheduling parameter is then marked and sorted. The first energy storage converter then sends all power scheduling parameters to all second energy storage converters in its group. Each second energy storage converter receives the corresponding power scheduling parameters based on the parameter markings and executes the appropriate power response operation. Since the energy management system does not directly allocate power to all energy storage converters but instead utilizes the first energy storage converters for power allocation within their respective energy storage converter groups, for energy storage systems with a large number of energy storage converters, it can effectively utilize the computational resources of the first energy storage converters. This significantly reduces the computational load on the energy management system during power allocation, lowers the pressure on the energy management system, and improves the response and execution speed of power scheduling commands.

[0038] The above embodiments do not limit the way the first energy storage converter processes the first transmission data. When the first transmission data includes the power scheduling parameters of the corresponding energy storage converter group, the first energy storage converter can perform analytical calculations on the power scheduling parameters of the energy storage converter group, complete the power scheduling task and allocation of each energy storage converter in the energy storage converter group, and obtain the second transmission data including the power scheduling parameters of each energy storage converter.

[0039] In related solutions, LC (Liquid Crystal Array) is used to realize data transmission between the energy management system and the energy storage converter, but direct communication between the energy storage converter and the energy management system is difficult. To quickly send the first transmission data from the energy management system to the first energy storage converter, a high-speed data channel can be established between the energy management system and the first energy storage converter. In some embodiments, the energy management system can connect to the first energy storage converter in at least one energy storage converter group via at least one first communication line, so that the energy management system can send the first transmission data of the corresponding energy storage converter group to the first energy storage converter in the corresponding energy storage converter group via each first communication line. The first communication line and the first energy storage converter can be in a one-to-one correspondence.

[0040] In the above embodiment, a first communication line is set between the energy management system and the first energy storage converter. For control parameters with high real-time requirements, such as power scheduling parameters, they are used as the first data transmission data. Instead of using the original data channel, a new data transmission channel is created that directly connects the EMS to the PCS host (i.e., the first energy storage converter). In this channel, the EMS bypasses the LC and directly establishes a communication connection with the PCS host, which can reduce communication layers and improve communication efficiency.

[0041] The above embodiments do not limit the first communication line. In some embodiments, the first communication line may use the GOOSE protocol. Both the GOOSE and TCP protocols use the OSI (Open System Interconnect) model for network transmission, but the GOOSE protocol only uses four layers of the seven-layer OSI model: the application layer, presentation layer, data link layer, and physical layer. Specifically, the protocol data unit (PDU) of the application layer is directly mapped to the data link layer and physical layer after being encoded by the presentation layer. This mapping method effectively improves the transmission latency caused by the communication stack, thereby ensuring the speed of data transmission and processing. Therefore, compared with the TCP protocol, the GOOSE protocol has faster data transmission and response. In the above embodiments, not only is a more direct data transmission path used, but the faster GOOSE communication method is also used, improving the data transmission speed and response speed of the energy storage system.

[0042] In order to quickly transmit the second transmission data from the first energy storage converter to each of the second energy storage converters, in some embodiments, each energy storage converter in the energy storage converter group can be connected through a second communication line, so that the first energy storage converter can transmit the second transmission data to each of the second energy storage converters in the energy storage converter group through the second communication line.

[0043] The above embodiments do not limit the second communication line. In some embodiments, the second communication line may adopt the CAN protocol. The second communication line used to connect the energy storage converters in the energy storage converter group adopts the CAN protocol, which can utilize the existing CAN interface and CAN line in related solutions to establish a data channel, with minimal hardware modification and low modification cost.

[0044] To ensure the energy storage system can respond promptly to control commands, in some embodiments, the energy storage converters in the energy storage converter group can be connected via a third communication line. This allows the first energy storage converter to send the second transmission data to each second energy storage converter in the group via the third communication line. For example, as mentioned above, the first energy storage converter performs secondary power allocation. The result of this secondary allocation (as an example of the second transmission data) can be sent to each second energy storage converter via the second communication line. Furthermore, the result can also be sent to each second energy storage converter via the third communication line, ensuring that power scheduling commands are executed. In other words, the first energy storage converter not only sends the second transmission data to each second energy storage converter via the second communication line but also via the third communication line. This dual data transmission ensures that each second energy storage converter receives the second transmission data, thereby improving the reliability of data transmission between the PCS master and slave devices. This ensures that each second energy storage converter receives various control parameters promptly, thus ensuring the energy storage system can respond to various control commands in a timely manner. Furthermore, this redundancy mechanism ensures that each second energy storage converter receives the second transmission data in a timely manner even if one of the communication lines (e.g., the second or third communication line) fails or is occupied, further guaranteeing the energy storage system's rapid response to control commands.

[0045] The above embodiments do not limit the third communication line. In some embodiments, the third communication line may use the Modbus TCP protocol. The second communication line used to connect the energy storage converters in the energy storage converter group uses the Modbus TCP protocol, which can utilize the existing NET interface and Ethernet ring network of related solutions to establish a data channel, with minimal hardware modifications and low modification costs.

[0046] like Figure 1 As shown, in the relevant scheme, the EMS performs power allocation calculations to obtain the power allocation parameters for each PCS. It then sends the power scheduling parameters of multiple PCS managed by each LC to the corresponding LC, which in turn sends the power scheduling parameters to each PCS via an Ethernet ring network. The ARM of each PCS receives the power scheduling parameters through the NET interface and then sends them to the DSP. It can be seen that the communication link for PCS to receive power scheduling parameters is relatively long, with four communication layers: EMS-LC-ARM-DSP. Furthermore, data forwarding occurs between the ARM and DSP within each PCS.

[0047] See Figures 3 to 5 , Figure 3 This is a structural block diagram of a first energy storage converter provided in an embodiment of this application. Figure 4This is a structural block diagram of a second energy storage converter provided in an embodiment of this application. Figure 5 This is a logic block diagram of another energy storage power station system responding to power dispatch commands, provided in an embodiment of this application. Figure 5 In the diagram, dashed lines represent data transmission paths.

[0048] like Figures 3 to 5 As shown, in order to shorten the data transmission path for the DSP inside the second energy storage converter to receive the second transmission data, in some embodiments, the first energy storage converter may include a first controller and a first actuator connected in communication, and the second energy storage converter includes a second actuator; the first controller is used to process the received first transmission data to obtain the second transmission data corresponding to each energy storage converter in the energy storage converter group, and the first actuator is used to send the second transmission data to the second actuator of each second energy storage converter in the energy storage converter group.

[0049] like Figure 3 As shown, the above embodiments do not limit the connection method between the first controller and the first actuator. For example, the first controller and the first actuator can be connected via a CAN line. Figure 4 As shown, the above embodiments do not limit the connection method between the second controller and the second actuator. For example, the second controller and the second actuator can be connected via a CAN line.

[0050] like Figure 5As shown, in the above embodiment, the first controller of the first energy storage converter processes the first transmitted data to obtain the second transmitted data, and sends the second transmitted data to the first actuator. The first actuator then sends the second transmitted data to the second actuators of each of the second energy storage converters. The first and second controllers can be, for example, ARM processors, and the first and second actuators can be, for example, DSP processors; the above embodiment does not limit this. The data transmission path for the second actuators inside the second energy storage converter to receive the second transmitted data has a three-level communication hierarchy: energy management system - first controller - first actuator and each second actuator (e.g., EMS-ARM-DSP). Compared with the four-level communication hierarchy of related schemes, this reduces the number of communication levels and shortens the data transmission path. Furthermore, data forwarding only occurs within the first energy storage converter between the first controller and the first actuator. The second actuator of the second energy storage converter no longer obtains the second transmission data through the second controller of its own second energy storage converter, but directly obtains the second transmission data from the first actuator of the first energy storage converter. This consolidates the multiple data forwarding steps between the controller and actuator within each energy storage converter into a single step, reducing the number of data forwarding steps between the second controller and the second actuator within each second energy storage converter. By shortening the data transmission path and reducing the number of data forwarding steps, the data transmission efficiency of the second transmission data is improved, which is beneficial for improving the response and execution speed of the energy storage system.

[0051] For example, the energy management system can be connected to the first controller via a first communication line. The actuators (including the first and second actuators) of each energy storage converter in the energy storage converter group can be connected via a second communication line. The controllers (including the first and second controllers) of each energy storage converter in the energy storage converter group can be connected via a third communication line. After receiving the first transmitted data, the first controller of the first energy storage converter processes it to obtain the second transmitted data. The first controller sends the second transmitted data to the first actuator, which then sends the second transmitted data to the second communication line (e.g., a CAN bus). In this way, the second actuators of all second energy storage converters on the second communication line can receive the second transmitted data, eliminating the need for the controller within each energy storage converter to forward data to the actuator. Therefore, not only can high data transmission efficiency be achieved between the energy management system and each energy storage converter, but the transmission of the second transmitted data via the second and third communication lines also ensures that the second actuators of each second energy storage converter receive the second transmitted data, thus balancing data transmission efficiency and data transmission quality. In addition, the first communication line can use the GOOSE protocol, the second communication line can use the CAN protocol, and the third communication line can use the Modbus TCP protocol.

[0052] By employing a combination of the aforementioned protocols, and by transmitting the first data through a newly established first communication line, while utilizing existing interfaces and communication lines to establish a new data channel (for transmitting the second data), the hardware modifications are minimal and the modification costs are low.

[0053] The data transmitted between the energy management system and the first energy storage converter includes not only control parameters and other data with high real-time requirements, but also other data with low real-time requirements, or data that does not need to be directly transmitted between the energy management system and the first energy storage converter. To improve the compatibility of the energy storage system and reduce the data transmission pressure between the energy management system and the first energy storage converter, in some embodiments, the energy storage control system may further include an energy management unit corresponding to each energy storage converter group; the energy management unit is communicatively connected to the energy management system, and also communicatively connected to each energy storage converter in the corresponding energy storage converter group; the energy management unit is used to transmit third transmission data between the energy management system and each energy storage converter in the corresponding energy storage converter group. In the above embodiments, the data transmitted between the energy management system and the first energy storage converter, in addition to the first transmission data directly transmitted between the energy management system and the first energy storage converter, may also include third transmission data forwarded through the energy management unit. That is, in addition to direct communication, the energy management system and the first energy storage converter can also achieve data transmission functionality between the energy management system and the first energy storage converter through the energy management unit. For example, the high-speed first communication line is only used to transmit first transmission data with high real-time requirements, such as power scheduling parameters. Other data (e.g., third transmission data) can still be transmitted through the existing LC and related communication lines without affecting the use of the existing data channel.

[0054] The above embodiments do not limit the connection method between the energy management unit and the energy management system and the energy storage converter. For example, the energy management unit and the energy management system can be connected through a switch, and the energy management unit and each energy storage converter can be connected through one or more of the following connection methods: Ethernet ring network connection, Bluetooth connection and RS485 connection.

[0055] The above embodiments do not limit the third transmitted data. The third transmitted data may include data with low real-time requirements and data that does not need to be directly transmitted between the energy management system and the first energy storage converter. In some embodiments, the priority of the third transmitted data may be lower than the priority of the first transmitted data. The priority of the data to be transmitted can be set according to actual needs, and the above embodiments do not limit this. As an example, the third transmitted data may include AC side data, such as the frequency, amplitude, phase, and current of the grid voltage. It can be seen that data with low real-time requirements and data that does not need to be directly transmitted between the energy management system and the first energy storage converter can still be transmitted through existing data channels (e.g., TCP data channels), and the above embodiments do not limit this.

[0056] See Figure 6 , Figure 6 This is a flowchart illustrating an energy storage control method provided in an embodiment of this application.

[0057] This application also provides an energy storage control method, which is applied to any of the above-mentioned energy storage control systems. The method includes steps S101 to S103.

[0058] Step S101: The energy management system determines the first transmission data for each energy storage converter group and sends the first transmission data of each energy storage converter group to the first energy storage converter in the corresponding energy storage converter group.

[0059] Step S102: The first energy storage converter processes the received first transmission data to obtain second transmission data corresponding to each energy storage converter in the energy storage converter group, and sends the second transmission data to each second energy storage converter in the energy storage converter group.

[0060] Step S103: The second energy storage converter performs the corresponding response operation based on the data corresponding to the second energy storage converter in the received second transmission data.

[0061] This application also provides an energy storage system, which includes any of the above-described energy storage control systems and energy storage battery systems. The energy storage battery system may include at least one energy storage subsystem, each energy storage subsystem corresponding to an energy storage converter group and an energy management unit. As an example, the energy storage subsystem may be a battery box, each battery box including at least one battery cluster, and each battery cluster including at least one battery pack.

[0062] It is understood that the specific examples in this application are only intended to help those skilled in the art better understand the implementation of this application, and are not intended to limit the scope of protection of this application.

[0063] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this application.

[0064] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and this application does not limit them.

[0065] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "one or more" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0066] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0067] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the embodiments described above can be referred to the corresponding processes in other embodiments, and will not be repeated here.

[0068] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0069] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the technical solution in this application, depending on actual needs.

[0070] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0071] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, essentially, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0072] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An energy storage control system, characterized in that, The energy storage control system includes an energy management system and at least one energy storage converter group, each energy storage converter group including a first energy storage converter and at least one second energy storage converter; The energy management system is used to determine the first transmission data of each energy storage converter group, and to send the first transmission data of each energy storage converter group to the first energy storage converter in the corresponding energy storage converter group. The first energy storage converter is used to process the received first transmission data to obtain second transmission data corresponding to each energy storage converter in the energy storage converter group, and to send the second transmission data to each second energy storage converter in the energy storage converter group. The second energy storage converter is used to perform a response operation corresponding to the data in the received second transmission data.

2. The energy storage control system according to claim 1, characterized in that, The energy management system connects to the first energy storage converter in at least one energy storage converter group through at least one first communication line, so that the energy management system can send the first transmission data of the corresponding energy storage converter group to the first energy storage converter in the corresponding energy storage converter group through each first communication line. Each energy storage converter in the energy storage converter group is connected through a second communication line, so that the first energy storage converter can send the second transmission data to each second energy storage converter in the energy storage converter group through the second communication line.

3. The energy storage control system according to claim 2, characterized in that, The first communication line uses the GOOSE protocol, and the second communication line uses the CAN protocol.

4. The energy storage control system according to claim 2, characterized in that, Each energy storage converter in the energy storage converter group is also connected via a third communication line, so that the first energy storage converter can send the second transmission data to each second energy storage converter in the energy storage converter group via the third communication line.

5. The energy storage control system according to claim 4, characterized in that, The third communication line uses the Modbus TCP protocol.

6. The energy storage control system according to any one of claims 1 to 5, characterized in that, The first energy storage converter includes a first controller and a first actuator connected in communication, and the second energy storage converter includes a second actuator; The first controller is used to process the received first transmission data to obtain second transmission data corresponding to each energy storage converter in the energy storage converter group, and the first actuator is used to send the second transmission data to the second actuator of each second energy storage converter in the energy storage converter group.

7. The energy storage control system according to claim 1, characterized in that, The energy storage control system also includes an energy management unit corresponding to each energy storage converter group; The energy management unit is communicatively connected to the energy management system, and is also communicatively connected to each energy storage converter in the corresponding energy storage converter group. The energy management unit is used to transmit third transmission data between the energy management system and each energy storage converter in the corresponding energy storage converter group.

8. The energy storage control system according to claim 7, characterized in that, The priority of the third transmitted data is lower than the priority of the first transmitted data.

9. The energy storage control system according to claim 1, characterized in that, The first transmitted data includes the power scheduling parameters of the corresponding energy storage converter group, and the second transmitted data includes the power scheduling parameters of each energy storage converter in the corresponding energy storage converter group.

10. An energy storage control method, characterized in that, The method, applied to the energy storage control system according to any one of claims 1 to 9, comprises: The energy management system determines the first transmission data for each energy storage converter group and sends the first transmission data of each energy storage converter group to the first energy storage converter in the corresponding energy storage converter group. The first energy storage converter processes the received first transmission data to obtain second transmission data corresponding to each energy storage converter in the energy storage converter group, and sends the second transmission data to each second energy storage converter in the energy storage converter group. The second energy storage converter performs a response operation based on the data corresponding to the second energy storage converter in the received second transmission data.

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