An energy storage system

Abstract

This application provides an energy storage system, relating to the field of battery energy storage system technology, including a battery management system, an energy storage converter, an energy management system, and a transformer substation monitoring and control device; the battery management system is connected to the energy storage converter via a first communication link and a second communication link; the battery management system is connected to the transformer substation monitoring and control device via a third communication link; the energy management system is connected to the battery management system, the energy storage converter, and the transformer substation monitoring and control device via a fourth communication link; the battery management system is used to determine the alarm level of battery status information according to preset rules, and is also used to send the alarm level to the energy management system, and send a control signal to the execution device according to the alarm level; the energy management system is used to send the control signal to the execution device according to the alarm level, ensuring the reliability of control signal transmission.

Description

Technical Field

[0001] This application relates to the field of battery energy storage system technology, and more specifically, to an energy storage system. Background Technology

[0002] Electrochemical energy storage systems, as key infrastructure supporting the stable operation of new power systems, typically consist of core units such as battery packs, battery management systems (BMS), energy management systems (EMS), power conversion systems (PCS), and transformer substation monitoring and control devices.

[0003] Energy storage stations often face complex electromagnetic environments, high harmonic content, and strong transient interference, which can easily lead to unstable communication and false alarms, resulting in frequent shutdowns and reduced equipment lifespan. For example, the communication control method relying on EMS and BMS is prone to communication interruptions and false alarms in scenarios with complex power quality and high interference, affecting system safety. Summary of the Invention

[0004] The problem addressed in this application is how to ensure the reliability of control signal transmission.

[0005] To address the aforementioned problems, this application provides an energy storage system.

[0006] This application provides an energy storage system, including a battery management system, an energy storage converter, an energy management system, and a transformer substation monitoring and control device; The battery management system is connected to the energy storage converter via a first communication link and a second communication link, respectively. The battery management system is connected to the transformer substation monitoring and control device via a third communication link; The energy management system is connected to the battery management system, the energy storage converter, and the transformer substation monitoring and control device via a fourth communication link. The battery management system is used to determine the alarm level of battery status information according to preset rules, and is also used to send the alarm level to the energy management system, and send a control signal to the execution device according to the alarm level, wherein the execution device includes the transformer substation monitoring and control device and / or the energy storage converter; The energy management system is used to send the control signal to the actuator according to the alarm level.

[0007] In one embodiment, the battery management system is used for: When the alarm level is higher than the intermediate alarm level, a first disconnect signal is generated according to the alarm level, wherein the first disconnect signal is used to cut off the switch of the actuator; When the alarm level is lower than or equal to the intermediate alarm level, a first power limiting signal is generated according to the alarm level, wherein the first power limiting signal is used to limit the executable power of the energy storage converter; The first disconnect signal or the first power limit signal is sent to the corresponding actuator.

[0008] In one embodiment, the battery management system is further configured to generate a first disconnect signal to disconnect the corresponding actuator when network communication between the battery management system and the actuator is interrupted.

[0009] In one embodiment, the battery management system is further configured to generate a relay disconnect signal after a preset time following the triggering of the first disconnect signal, wherein the relay disconnect signal is used to disconnect all relays in the high-voltage box. In one embodiment, the energy management system sends the first disconnect signal via the first communication link or the third communication link; and sends the first power limit signal via the second communication link.

[0010] In one embodiment, the energy management system is configured to receive the alarm level from the battery management system; When the alarm level is higher than the medium alarm level, a second disconnect signal is generated according to the alarm level, wherein the second disconnect signal is used to cut off the switch of the actuator; When the alarm level is lower than or equal to the intermediate alarm level, a second power limiting signal is generated according to the alarm level, wherein the second power limiting signal is used to limit the executable power of the energy storage converter.

[0011] In one embodiment, the battery management system is further configured to: When the alarm level is a low alarm level and the alarm category is cell status, a power reduction signal is generated. When the alarm level is the intermediate alarm level, an execution power reset signal is generated; The power reduction signal or the power clearing signal is sent to the energy storage converter.

[0012] In one embodiment, the energy storage converter is further used for: When the alarm signal is a high alarm level, determine whether the first disconnect signal from the battery management system has been received; If the first disconnection signal is not received, the alarm signal is determined to be a false alarm; When the first disconnection signal is received, the DC circuit breaker of the energy storage converter is disconnected.

[0013] In one embodiment, the energy storage converter is further configured to: disconnect the DC circuit breaker of the energy storage converter when a first disconnect signal is received from the battery management system but a second disconnect signal is not received from the energy management system, or when the network communication of the energy storage converter is interrupted.

[0014] In one embodiment, the transformer substation monitoring and control device is used for: In response to an alarm signal from a front-end device, when the alarm signal is a high alarm level, it is determined whether a first disconnect signal from the battery management system and a second disconnect signal from the energy management system are received, wherein the front-end device includes the battery management system and / or the energy management system; When the second disconnect signal is received but the first disconnect signal is not received, the alarm signal is determined to be a false alarm; When the first disconnect signal is received, the medium-voltage switch of the transformer substation monitoring and control device is disconnected.

[0015] By adopting the above technical solution, the battery management unit is connected to the energy storage converter through the first and second communication links respectively. The dual-link redundancy scheme ensures that the control signals do not rely on a single communication method. Even when the network is disturbed or the protocol is abnormal, the operation can still be completed through the redundant communication links. The battery management unit is connected to the transformer substation monitoring and control device through a third communication link. This third communication link is independent of other data networks and is dedicated to driving the medium-voltage switch to trip in the event of a first-level alarm. This ensures that the grid-side isolation action is not affected by communication delays or software processing, guaranteeing the disconnection of external electrical connections in the shortest possible time and enhancing the timeliness and reliability of fault response.

[0016] The energy management unit is connected to the battery management unit, energy storage converter, and transformer substation monitoring and control device via a fourth communication link. The fourth communication link can form a second control path in parallel with the local control. When the local link fails, the upper-level commands transmitted through the fourth communication link can still participate in protection as a supplementary means, forming a redundancy mechanism.

[0017] The battery management unit determines the alarm level according to preset rules and sends the alarm level to the energy management unit. Simultaneously, it sends a control signal to the actuator based on the alarm level. The energy management unit also sends a control signal to the actuator based on the alarm level. The same alarm level triggers two control signals from independent sources. The actuator can receive the same type of command from different physical channels and logical sources. Even if one signal is lost due to electromagnetic interference, loose wiring, or protocol parsing errors, the other signal can still complete the control task. This dual-signal mechanism reduces the probability of complete control signal failure. Attached Figure Description

[0018] Figure 1 Here is a system topology diagram of an energy storage system according to some embodiments of this application; Figure 2 This is a control flowchart of a battery management system according to some embodiments of this application; Figure 3 This is a schematic diagram of the transmission of a three-level alarm signal according to some embodiments of this application; Figure 4 This is a schematic diagram illustrating the transmission of a secondary alarm signal according to some embodiments of this application; Figure 5 This is a schematic diagram of the transmission of a first-level alarm signal according to some embodiments of this application. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this application more apparent and understandable, specific embodiments of this application are described in detail below with reference to the accompanying drawings. Although some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0020] It should be understood that the steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this application is not limited in this respect.

[0021] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the description below. It should be noted that the concepts of "first," "second," etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "one" and "more" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] The names of messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0024] like Figure 1 and Figure 2 As shown in the figure, an energy storage system provided in this application embodiment includes a battery management system, an energy storage converter, an energy management system, and a transformer substation monitoring and control device; The battery management system is connected to the energy storage converter via a first communication link and a second communication link.

[0025] The battery management system is connected to the transformer substation monitoring and control device via a third communication link.

[0026] The energy management system is connected to the battery management system, the energy storage converter, and the transformer substation monitoring and control device via a fourth communication link.

[0027] The battery management system is used to determine the alarm level of battery status information according to preset rules, and is also used to send the alarm level to the energy management system, and send control signals to the execution device according to the alarm level, wherein the execution device includes the transformer substation monitoring and control device and / or the energy storage converter.

[0028] The energy management system is used to send the control signal to the actuator according to the alarm level.

[0029] It includes a Battery Management System (BMS), a Power Conversion System (PCS), an Energy Management System (EMS), and transformer substation monitoring and control devices. These components are interconnected through multiple communication links, forming a safety control architecture with hierarchical response and multiple redundancy mechanisms.

[0030] A Battery Management System (BMS) collects battery status information reflecting the operating status of electrochemical energy storage units and analyzes this information according to preset rules to determine the corresponding alarm level. The battery status information includes electrical or thermal parameters such as individual cell voltage, temperature, current, insulation resistance, and the operating status of internal equipment. The preset rules, based on electrochemical characteristics, equipment tolerance, and safety margins, are used to map abnormal parameter patterns to alarm levels of varying severity. For example, an individual cell voltage below 2.5V or above 3.65V, a cell surface temperature exceeding 55°C, or a battery cluster insulation resistance below 50kΩ are all considered abnormal status information that can be collected. The preset rules, based on electrochemical characteristics, equipment tolerance, and safety margins, are used to map abnormal parameter patterns to alarm levels of varying severity. For example, a momentary but not sustained voltage exceedance by a single cell triggers a Level 3 alarm; a temperature consistently above 50°C for several minutes triggers a Level 2 alarm; and a sudden drop in insulation resistance below 10kΩ or a temperature rise rate exceeding 1°C / s for multiple cells triggers a Level 1 alarm. These rules enable tiered identification and response to different risk scenarios.

[0031] The battery management system is connected to the power conversion system (PCS) via a first communication link and a second communication link. The first communication link is a highly reliable hard-wired channel that uses a passive dry contact and does not rely on external power supply or communication protocols. For example, in the event of a serious alarm, it directly outputs a disconnect signal to drive the power conversion system to perform a DC-side circuit breaker operation.

[0032] In one embodiment, the second communication link is, for example, an industrial fieldbus based on a controller area network (CAN), used to transmit power limiting commands, operating status and alarm information, enabling real-time, interference-resistant device-level data interaction.

[0033] The battery management system is connected to the transformer substation monitoring and control device via a third communication link. This third communication link also employs a passive dry contact structure, closing or opening synchronously upon triggering an alarm signal, directly controlling the transformer substation monitoring and control device to trip the medium-voltage switch, thus isolating the energy storage system from the AC side of the power grid. The dry contact design is independent of any network communication, ensuring that critical protection actions can still be performed in the event of communication link failure or software malfunction. The same actuator can receive similar control signals from different sources and different physical channels; if one link fails, the other link can still maintain basic protection functions. The Energy Management System (EMS) is connected to the Battery Management System, the Energy Storage Converter, and the Transformer Measurement and Control Device via a fourth communication link.

[0034] In one embodiment, the fourth communication link adopts an industrial communication protocol based on TCP / IP (such as MODBUS TCP) to form a station control layer communication network, which is suitable for long-distance, multi-device access monitoring and scheduling scenarios. Through the fourth communication link, the energy management system receives alarm level information from the battery management system, generates corresponding control signals, and sends them to the energy storage converter or transformer substation monitoring and control device to achieve upper-level coordinated control.

[0035] The actuators include at least one of the energy storage converter and the transformer substation monitoring and control device. The energy storage converter controls the DC-side energy flow and has an internal DC circuit breaker to disconnect the battery from the power conversion circuit upon receiving a disconnection signal. The transformer substation monitoring and control device manages the medium-voltage grid-connected switch, achieving electrical isolation between the energy storage system and the power grid. Both actuators can receive control signals from the battery management system and remote control signals from the energy management system, forming a dual-path redundancy command scheme.

[0036] In one embodiment, such as Figure 5 As shown, the battery management system is used for: When the alarm level is higher than the intermediate alarm level, a first disconnect signal is generated according to the alarm level, wherein the first disconnect signal is used to cut off the switch of the actuator; When the alarm level is lower than or equal to the intermediate alarm level, a first power limiting signal is generated according to the alarm level, wherein the first power limiting signal is used to limit the executable power of the energy storage converter; The first disconnect signal or the first power limit signal is sent to the corresponding actuator.

[0037] In one embodiment, the alarm level represents a classification identifier used to reflect the current operational risk level of the battery. The intermediate alarm level corresponds to the second-level alarm, and the alarm level above the intermediate level corresponds to the first-level alarm, indicating that there is a serious safety threat. The alarm level below or equal to the intermediate level includes the second-level and third-level alarms, which correspond to moderate and minor anomalies, respectively.

[0038] When the alarm level is higher than the medium alarm level, the battery management system generates a first disconnect signal. The first disconnect signal is used to trigger the switching action in the actuator, causing the energy storage converter to trip the DC circuit breaker, or causing the transformer substation monitoring and control device to open the medium voltage switch, thereby cutting off the electrical connection between the energy storage device and the power circuit or the power grid, and preventing the fault from escalating.

[0039] When the alarm level is lower than or equal to the medium alarm level, the battery management system generates a first power limit signal. The first power limit signal is used to constrain the current charge and discharge power that the energy storage converter can perform, for example by setting a maximum current limit, an active power limit, or a power ratio coefficient, so that energy exchange is maintained within a safe range and the abnormal state is prevented from deteriorating further.

[0040] The battery management system sends the generated first disconnect signal or first power limit signal to the corresponding actuator. The signal transmission path includes hard-wired dry contact channels or device-level communication links to issue fast and reliable control commands. The response strength is matched according to the risk level; high-risk events trigger a disconnect operation, while low-risk events only implement power regulation, balancing safety and operational continuity.

[0041] In one embodiment, the battery management system is further configured to generate a first disconnect signal to disconnect the corresponding actuator when network communication between the battery management system and the actuator is interrupted.

[0042] In one embodiment, network communication refers to a data interaction link established between the battery management system and the actuator via an industrial communication protocol, used to transmit alarm information, control commands, or status feedback. The actuator includes at least one of an energy storage converter and a transformer substation monitoring and control device.

[0043] When the battery management system detects a network communication interruption with any actuator, it determines that the actuator is unable to receive control commands or upload its operating status. In this situation, the communication interruption itself is considered a potentially high-risk event, as it may prevent subsequent emergency commands from being delivered, causing the equipment to continue operating without effective monitoring.

[0044] To prevent the fault from developing under conditions of communication failure, the battery management system automatically generates a first disconnect signal and outputs it to the corresponding actuator. If the interrupted object is the energy storage converter, the first disconnect signal is used to drive its DC circuit breaker to trip; if the interrupted object is the transformer substation monitoring and control device, it is used to trigger its medium-voltage switch to trip.

[0045] In one embodiment, such as Figure 5 As shown, the battery management system is also used to generate a relay disconnect signal after a preset time following the triggering of the first disconnect signal, wherein the relay disconnect signal is used to disconnect all relays in the high-voltage box.

[0046] In one embodiment, the first disconnect signal represents a protection command generated when the alarm level reaches level one, used to drive the actuator to disconnect the main circuit electrical connection. The preset duration is a pre-configured time delay, for example, set to 5-20 seconds, to provide a time window for external equipment to complete the initial tripping action.

[0047] After the preset time elapsed following the initial disconnection signal, the battery management system generates a relay disconnection signal. This signal controls the disconnection of all relays in the high-voltage box inside the battery container, achieving physical isolation between the battery clusters and the internal DC bus.

[0048] The technical solution in this embodiment forms an orderly two-stage power-off sequence: first, the execution device (energy storage converter, transformer substation monitoring and control device) quickly isolates the AC side or DC main circuit, and then the internal relay cuts off the battery power source. This avoids the potential for arc superposition, voltage surges, or protection conflicts caused by the simultaneous operation of multiple switches, ensuring rapid fault isolation while improving the safety of the power-off process.

[0049] In one embodiment, the energy management system sends the first disconnect signal via the first communication link or the third communication link; and sends the first power limit signal via the second communication link.

[0050] In one embodiment, the first communication link is a dry contact channel connecting the battery management system and the energy storage converter, and the third communication link is another dry contact channel connecting the battery management system and the transformer substation monitoring and control device. This third link does not rely on a communication protocol or external power supply and is suitable for highly reliable transmission of emergency trip commands. The second communication link is a communication channel based on an industrial fieldbus, used to transmit regulation commands at the device level.

[0051] When a Level 1 alarm occurs, the energy management system can send a first disconnect signal to the energy storage converter via the first communication link or to the transformer substation monitoring and control device via the third communication link. The first disconnect signal acts directly on the switching control circuit of the actuator through the dry contact physical path, achieving rapid electrical isolation. Its advantages are strong anti-interference capability and high response determinism, making it suitable for emergency scenarios that endanger safety.

[0052] When the alarm level is at level two or three, the energy management system sends a first power limit signal to the energy storage converter via the second communication link. The first power limit signal is transmitted in the form of a digital message and is used to dynamically adjust the charging and discharging power limits.

[0053] In one embodiment, the energy management system is configured to receive the alarm level from the battery management system; When the alarm level is higher than the medium alarm level, a second disconnect signal is generated according to the alarm level, wherein the second disconnect signal is used to cut off the switch of the actuator; When the alarm level is lower than or equal to the intermediate alarm level, a second power limiting signal is generated according to the alarm level, wherein the second power limiting signal is used to limit the executable power of the energy storage converter.

[0054] In one embodiment, after receiving an alarm level from the battery management unit, the energy management unit generates a corresponding control command based on its severity. When the alarm level is higher than the medium alarm level, a second disconnect signal is generated. The second disconnect signal is used to drive the switching action in the actuator, causing the energy storage converter to trip the DC circuit breaker, or causing the transformer substation monitoring and control device to open the medium-voltage switch, thereby achieving electrical isolation.

[0055] When the alarm level is lower than or equal to the medium alarm level, a second power limit signal is generated. The second power limit signal is used to constrain the current charge and discharge power that the energy storage converter can perform, for example by setting a power upper limit or current limit to prevent the abnormal state from deteriorating further.

[0056] In one embodiment, such as Figure 3 and Figure 4 As shown, the battery management system is also used for: When the alarm level is a low alarm level and the alarm category is cell status, a power reduction signal is generated. When the alarm level is the intermediate alarm level, an execution power reset signal is generated; The power reduction signal or the power clearing signal is sent to the energy storage converter.

[0057] In one embodiment, when the alarm level is low and the alarm category belongs to the cell status category, the battery management unit generates an execution power halving signal. The execution power halving signal is used to instruct the energy storage converter to limit the current charge / discharge power to a portion of the rated value, for example, to limit the current charge / discharge power to 50% of the rated value, to prevent minor abnormalities from developing into serious faults, while maintaining the online operation of the equipment.

[0058] When the alarm level reaches the medium level, regardless of the alarm category, the battery management unit generates an execution power reset signal. The execution power reset signal is used to instruct the energy storage converter to stop power exchange, preventing the medium risk from worsening.

[0059] The energy management system sends the generated power reduction signal (half power) or power reset signal (zero power) to the energy storage converter as the first power limiting signal. By combining alarm levels and alarm categories, differentiated power responses are achieved. For minor anomalies in recoverable cells, load reduction is implemented, while for moderate risks, energy exchange is completely stopped. This ensures that control actions match the actual risk characteristics, balancing safety and operational efficiency.

[0060] In one embodiment, the energy storage converter is further used for: When the alarm signal is a high alarm level, determine whether the first disconnect signal from the battery management system has been received; If the first disconnection signal is not received, the alarm signal is determined to be a false alarm; When the first disconnection signal is received, the DC circuit breaker of the energy storage converter is disconnected.

[0061] In one embodiment, the battery management unit generates a first disconnect signal when a level 1 alarm is detected. This signal is output via a dry contact, providing high reliability and independence from upper-level communication. When the energy storage converter receives an alarm signal marked as a high-level alarm, it further determines whether it has simultaneously received the first disconnect signal from the battery management unit. If this signal is not detected, the current alarm is considered to lack confirmation from the local protection unit and may originate from communication errors or upper-level logic errors, thus being judged as a false alarm, and no tripping action is performed.

[0062] If the first disconnection signal is received, the fault is considered to have actually occurred. The energy storage converter immediately drives the DC circuit breaker to trip, cutting off the electrical connection between the battery and the power conversion circuit. The local judgment of the battery management unit is a necessary condition for the tripping decision. Dual signal verification distinguishes between real emergency events and false alarms, maintaining high safety while avoiding unnecessary shutdowns.

[0063] In one embodiment, the energy storage converter is further configured to: disconnect the DC circuit breaker of the energy storage converter when a first disconnect signal is received from the battery management system but a second disconnect signal is not received from the energy management system, or when the network communication of the energy storage converter is interrupted.

[0064] In one embodiment, when the energy storage converter receives a first disconnect signal from the battery management unit but does not simultaneously receive a second disconnect signal from the energy management unit, it indicates that the upper-level coordination command may be lost or delayed. In this case, the local protection command from the battery management unit has the highest priority, and the energy storage converter performs a DC circuit breaker tripping operation.

[0065] When the energy storage converter experiences a network communication interruption and is unable to interact normally with the battery management unit or energy management unit, it will consider the current state as a potentially high-risk operating condition even if it does not fully receive the two types of disconnection signals. Because the battery's safety status cannot be confirmed and subsequent emergency commands cannot be relied upon, the DC circuit breaker will be actively disconnected to prevent continued operation without monitoring and protection.

[0066] The energy storage converter makes autonomous decisions when there is a signal loss or link failure, using dry contact signals as the core criterion, effectively avoiding the loss of protection functions due to network anomalies.

[0067] In one embodiment, the transformer substation monitoring and control device is used for: In response to an alarm signal from a front-end device, when the alarm signal is a high alarm level, it is determined whether a first disconnect signal from the battery management system and a second disconnect signal from the energy management system are received, wherein the front-end device includes the battery management system and / or the energy management system; When the second disconnect signal is received but the first disconnect signal is not received, the alarm signal is determined to be a false alarm; When the first disconnect signal is received, the medium-voltage switch of the transformer substation monitoring and control device is disconnected.

[0068] In one embodiment, when the transformer substation monitoring and control device receives an alarm signal marked as a high alarm level, it further determines whether it has simultaneously received a first disconnect signal from the battery management unit and a second disconnect signal from the energy management unit. If only the second disconnect signal is received and the first disconnect signal is not detected, it is considered that the alarm lacks confirmation from the local protection unit on the battery side, which may be due to upper-level misjudgment or communication interference, and is therefore determined to be a false alarm, without triggering the medium-voltage switch to trip.

[0069] If the first disconnection signal is received, regardless of whether a second disconnection signal is received simultaneously, it is considered a genuine fault. The transformer substation monitoring and control device immediately drives the medium-voltage switch to trip, disconnecting the energy storage device from the power grid. Local commands from the battery management unit are used as a necessary condition for tripping. Dual-source signal comparison improves the accuracy of the judgment, ensuring grid-side safety while suppressing unnecessary disconnections, thus balancing reliability and operational stability.

[0070] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc. In this application, 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 embodiments of this application according to actual needs. Furthermore, 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. The integrated units can be implemented in hardware or as software functional units.

[0071] Although the above disclosure is provided, the scope of protection of this application is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this application, and all such changes and modifications will fall within the scope of protection of this application.

Claims

1. An energy storage system, characterized in that, This includes a battery management system, an energy storage converter, an energy management system, and a transformer substation monitoring and control device. The battery management system is connected to the energy storage converter via a first communication link and a second communication link, respectively. The battery management system is connected to the transformer substation monitoring and control device via a third communication link; The energy management system is connected to the battery management system, the energy storage converter, and the transformer substation monitoring and control device via a fourth communication link. The battery management system is used to determine the alarm level of battery status information according to preset rules, and is also used to send the alarm level to the energy management system, and send a control signal to the execution device according to the alarm level, wherein the execution device includes the transformer substation monitoring and control device and / or the energy storage converter; The energy management system is used to send the control signal to the actuator according to the alarm level.

2. The energy storage system according to claim 1, characterized in that, The battery management system is used for: When the alarm level is higher than the intermediate alarm level, a first disconnect signal is generated according to the alarm level, wherein the first disconnect signal is used to cut off the switch of the actuator; When the alarm level is lower than or equal to the intermediate alarm level, a first power limiting signal is generated according to the alarm level, wherein the first power limiting signal is used to limit the executable power of the energy storage converter; The first disconnect signal or the first power limit signal is sent to the corresponding actuator.

3. The energy storage system according to claim 2, characterized in that, The battery management system is also configured to generate a first disconnect signal to disconnect the corresponding actuator when the network communication between the battery management system and the actuator is interrupted.

4. The energy storage system according to claim 3, characterized in that, The battery management system is also used to generate a relay disconnect signal after a preset time following the triggering of the first disconnect signal, wherein the relay disconnect signal is used to disconnect all relays in the high-voltage box.

5. The energy storage system according to claim 2, characterized in that, The energy management system sends the first disconnect signal via the first communication link or the third communication link; and sends the first power limit signal via the second communication link.

6. The energy storage system according to claim 1, characterized in that, The energy management system is used to receive the alarm level from the battery management system; When the alarm level is higher than the medium alarm level, a second disconnect signal is generated according to the alarm level, wherein the second disconnect signal is used to cut off the switch of the actuator; When the alarm level is lower than or equal to the intermediate alarm level, a second power limiting signal is generated according to the alarm level, wherein the second power limiting signal is used to limit the executable power of the energy storage converter.

7. The energy storage system according to claim 1, characterized in that, The battery management system is also used for: When the alarm level is a low alarm level and the alarm category is cell status, a power reduction signal is generated. When the alarm level is the intermediate alarm level, an execution power reset signal is generated; The power reduction signal or the power clearing signal is sent to the energy storage converter.

8. The energy storage system according to claim 2, characterized in that, The energy storage converter is also used for: When the alarm signal is a high alarm level, determine whether the first disconnect signal from the battery management system has been received; If the first disconnection signal is not received, the alarm signal is determined to be a false alarm; When the first disconnection signal is received, the DC circuit breaker of the energy storage converter is disconnected.

9. The energy storage system according to claim 8, characterized in that, The energy storage converter is also used to: disconnect the DC circuit breaker of the energy storage converter when it receives the first disconnect signal from the battery management system but does not receive the second disconnect signal from the energy management system, or when the network communication of the energy storage converter is interrupted.

10. The energy storage system according to claim 1, characterized in that, The transformer substation monitoring and control device is used for: In response to an alarm signal from a front-end device, when the alarm signal is a high alarm level, it is determined whether a first disconnect signal from the battery management system and a second disconnect signal from the energy management system are received, wherein the front-end device includes the battery management system and / or the energy management system; When the second disconnect signal is received but the first disconnect signal is not received, the alarm signal is determined to be a false alarm; When the first disconnect signal is received, the medium-voltage switch of the transformer substation monitoring and control device is disconnected.

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