Integrated high-voltage tank electrical control system for energy storage system

Abstract

The application discloses an integrated high-voltage box electrical control system for an energy storage system, comprising a high-voltage main loop module, an insulation monitoring module, a power-on self-checking module, a protection and control module and a power supply module. The insulation monitoring module only performs PCS insulation detection after the contactor is closed, thereby completely solving the BMS and PCS insulation detection conflict problem. The inter-cluster voltage difference detection and circulating current balancing mechanism before power-on controls the inter-cluster voltage difference at the power-on moment within a set range, thereby effectively inhibiting the inter-cluster circulating current. The integrated main circuit breaker and fuse double overcurrent protection, split excitation tripping protection, insulation monitoring protection, power-on self-checking protection, on-off state feedback of each electrical device of the main loop and key fault point linkage monitoring such as commercial power outage and water immersion realize the whole-process safety management and control of the high-voltage loop from input to output, thereby greatly reducing the system high-voltage safety risk. The seamless switching design of the dual power supply guarantees uninterrupted power supply of the key load, and the power supply redundancy is sufficient.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power distribution and safety control technology for energy storage battery systems, and particularly to an integrated high-voltage box electrical control system for energy storage systems. Background Technology

[0002] With the rapid development of electrochemical energy storage technology, the safe and reliable operation of high-voltage energy storage battery clusters has become a core requirement of the industry. As an intermediate unit connecting the battery cluster and the energy storage converter, the high-voltage box is responsible for the data acquisition, control, and protection of the battery cluster. Its safety and reliability directly determine the stability of the system and the return on investment.

[0003] However, the control systems of traditional high-voltage boxes have multi-dimensional safety and reliability defects in actual operation, making it difficult to meet increasingly stringent energy storage safety standards: (1) Inadequate insulation detection mechanism: Traditional solutions rely on the bridge method for insulation detection. The insulation detection logic of the battery management system (BMS) and the energy storage converter (PCS) is prone to conflict, resulting in abnormal insulation value reporting. At best, it triggers false alarm faults and causes system shutdown; at worst, insulation failure leads to increased leakage current and ultimately thermal runaway of the battery cell. (2) Unreliable power-on process logic: Traditional high-voltage boxes lack the inter-cluster total voltage detection step before power-on. As the number of cell cycles increases and the operating environment varies, the consistency of the cells decreases, which can easily cause inter-cluster circulating current, increase heat loss, accelerate cell aging, and the aging further widens the inter-cluster differences, forming a vicious cycle. (3) Inadequate protection and feedback mechanism: Traditional high-voltage boxes only realize basic on-off control, lack status feedback of main circuit contactor, circulating current equalization circuit and main circuit breaker circuit, and do not conduct linkage monitoring of key fault points such as mains power failure, water immersion and abnormal temperature, resulting in low fault location and response efficiency. (4) Insufficient power supply redundancy: The internal control power supply of traditional high-voltage boxes relies on a single circuit of DC / DC battery side or AC / DC mains power side. When a single power supply is interrupted, it cannot guarantee the power supply of critical loads, and does not support black start function, which reduces the availability of emergency backup power and off-grid scenarios. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide an integrated high-voltage box electrical control system for energy storage systems, which solves the technical problems of existing high-voltage boxes such as imperfect insulation detection mechanism, unreliable power-on process logic, imperfect protection and feedback mechanism, and insufficient power supply redundancy, thereby improving the safety, reliability and maintainability of the high-voltage circuit of the energy storage system.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An integrated high-voltage box electrical control system for an energy storage system includes: a high-voltage main circuit module for connecting battery clusters and a power control system (PCS), wherein the high-voltage main circuit module is equipped with a contactor for controlling the on / off state of the high-voltage main circuit module; an insulation monitoring module including a battery management system (BMS) insulation detection unit and a PCS insulation detection unit, wherein before the contactor closes, the BMS insulation detection unit and the PCS insulation detection unit are simultaneously activated to independently perform insulation detection, and after the contactor closes, the BMS insulation detection unit is deactivated, and only the PCS insulation detection unit performs insulation detection; a power-on self-test module for detecting the total voltage of each battery cluster and calculating the maximum voltage difference between clusters before the contactor closes, triggering inter-cluster circulating current equalization or prohibiting contactor closing based on a voltage difference threshold; and a protection and control module, including... The system includes a circuit breaker and fuse protection circuit and a status feedback circuit. The circuit breaker and fuse protection circuit includes a main circuit breaker and a fuse connected in series in the connection path between the battery pack and the PCS. The fusing time of the fuse is less than the contactor's sticking time. The status feedback circuit is used to collect contactor status signals, main circuit breaker status signals, fuse status signals, mains power failure feedback signals, and water immersion fault feedback signals to realize status feedback and fault linkage protection of main circuit electrical components. The power supply module includes one DC / DC switching power supply and one AC / DC switching power supply. The DC / DC switching power supply draws power from the battery side, and the AC / DC switching power supply draws power from the mains side. The output terminals of the two switching power supplies are connected in parallel after being protected against reverse connection by a common cathode diode.

[0006] Preferably, the insulation monitoring module further includes a polling scheduling unit, which is used to configure a unique address code for each cluster BMS in a multi-cluster parallel scenario, and to poll and execute the insulation monitoring of each cluster in the order of the address codes, with a polling period of no more than 10 minutes.

[0007] Preferably, the power-on self-test module further includes: a voltage acquisition unit, used to acquire the total voltage of each parallel battery cluster before the contactor closes; a differential voltage comparison unit, used to calculate the maximum differential voltage between clusters and compare the maximum differential voltage between clusters with a first differential voltage threshold and a second differential voltage threshold, wherein the first differential voltage threshold is greater than the second differential voltage threshold; an over-limit alarm unit, used to prohibit the contactor from closing and issue a differential voltage over-limit alarm when the maximum differential voltage between clusters is greater than or equal to the first differential voltage threshold; and a balancing control unit, used to control the circulating current balancing contactor to engage and initiate inter-cluster circulating current balancing when the maximum differential voltage between clusters is greater than or equal to the second differential voltage threshold and less than the first differential voltage threshold, until the contactor closes when the maximum differential voltage between clusters is less than the second differential voltage threshold.

[0008] Preferably, the main circuit breaker is equipped with a shunt trip unit for triggering the shunt trip of the main circuit breaker in the event of a serious fault.

[0009] Preferably, the contactor includes a main positive contactor for controlling the connection and disconnection between the positive terminal of the battery cluster and the PCS, and a main negative contactor for controlling the connection and disconnection between the negative terminal of the battery cluster and the PCS; the contactor status signals are auxiliary contact signals of the main positive contactor and the main negative contactor, the main circuit breaker status signal is auxiliary contact signal of the main circuit breaker, the fuse status signal is auxiliary contact signal of the fuse, the mains power failure fault feedback signal is auxiliary contact signal of the mains power failure detection point, and the water immersion fault feedback signal is auxiliary contact signal of the water immersion detection point.

[0010] Preferably, when the contactor and main circuit breaker are in the open state, the auxiliary contacts of the main positive contactor, the main negative contactor, and the main circuit breaker are normally open; when the contactor and main circuit breaker are in the closed state, the auxiliary contacts of the main positive contactor, the main negative contactor, and the main circuit breaker are normally closed; when the fuse blows, the fuse auxiliary contact switches to the normally open state; when a mains power failure or water immersion fault occurs, the mains power failure detection point auxiliary contact and the water immersion detection point auxiliary contact switch to the normally closed state.

[0011] Preferably, the power module further includes a 24V power supply output unit, which has two independent output interfaces: one is a critical load power supply interface for supplying power to critical loads, and the other is a non-critical load power supply interface for supplying power to non-critical loads.

[0012] Preferably, the power module further includes a non-critical load management unit: when the external energy management system detects a mains power failure, it outputs a dry contact signal to the detection input terminal of the BMS. The detection input terminal of the BMS is associated with the non-critical load contactor, enabling the non-critical load contactor to disconnect and cut off the output of the non-critical load power supply interface.

[0013] Preferably, the power module supports black start function: when the mains power fails, the PCS switches to off-grid operation mode, closes the DC side circuit breaker of the high-voltage box, and the BMS and EMS draw power from the DC / DC switching power supply to forcibly close the contactor of the high-voltage main circuit module, and outputs a stable AC voltage through the PCS to provide initial power for the black start of subsequent equipment.

[0014] Preferably, the integrated high-voltage box electrical control system for the energy storage system also integrates a multi-protocol communication interface, supporting CAN bus, RS485 bus and LAN Ethernet communication.

[0015] The aforementioned energy storage system uses an integrated high-voltage box electrical control system. After the contactor closes, it only performs PCS insulation detection, completely resolving the conflict between BMS and PCS insulation detection. The inter-cluster voltage difference detection and circulating current balancing mechanism before power-on controls the inter-cluster voltage difference within the set range at the moment of power-on, effectively suppressing inter-cluster circulating current. It integrates multiple protections such as dual overcurrent protection of the main circuit breaker and fuse, shunt trip protection, insulation monitoring protection, power-on self-test protection, feedback of the on / off status of each electrical component in the main circuit, and linkage monitoring of key fault points such as mains power failure and water immersion, realizing full-process safety control of the high-voltage circuit from input to output, and significantly reducing the high-voltage safety risks of the system. The seamless switching design of dual power supplies ensures uninterrupted power supply to critical loads, with sufficient power redundancy. Attached Figure Description

[0016] Figure 1 This is a system architecture diagram of an integrated high-voltage box electrical control system for an energy storage system according to one embodiment of the present invention. Detailed Implementation

[0017] To enable those skilled in the art to more clearly understand the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] This invention provides an integrated high-voltage box electrical control system for energy storage systems, which solves the technical problems of existing high-voltage boxes, such as imperfect insulation detection mechanism, unreliable power-on process logic, imperfect protection and feedback mechanism, and insufficient power supply redundancy. It improves the safety, reliability and maintainability of the high-voltage circuit of the energy storage system and is applicable to energy storage systems with both air-cooled and liquid-cooled heat dissipation methods.

[0019] like Figure 1 As shown, in one embodiment of the present invention, the integrated high-voltage box electrical control system for the energy storage system includes a high-voltage main circuit module, an insulation monitoring module, a power-on self-test module, a protection and control module, and a power supply module. The specific circuit structure and working principle of each module are as follows: (1) High-voltage main circuit module The high-voltage main circuit module is used to connect the battery cluster and the energy storage converter to form the high-voltage circuit of the energy storage system. The high-voltage main circuit module is equipped with contactors for controlling the on / off state of the high-voltage main circuit module. The contactors include a main positive contactor and a main negative contactor. The main positive contactor controls the connection between the positive terminal of the battery cluster and the PCS, and engages after passing the power-on self-test. The main negative contactor controls the connection between the negative terminal of the battery cluster and the PCS, and operates synchronously with the main positive contactor.

[0020] (2) Insulation monitoring module The insulation monitoring module includes a BMS insulation detection unit and a PCS insulation detection unit. Before the contactor closes, both the BMS and PCS insulation detection units are activated simultaneously to perform insulation detection independently. After the contactor closes, the BMS insulation detection unit is deactivated, and only the PCS insulation detection unit performs insulation detection; that is, only the PCS insulation detection is performed.

[0021] The insulation monitoring module also includes a polling scheduling unit, which, in multi-cluster parallel scenarios, configures a unique address code for each cluster BMS and polls and executes insulation monitoring of each cluster according to the address code order, with a polling cycle not exceeding 10 minutes. By polling and staggering the execution of insulation monitoring for each cluster, the problem of low insulation values ​​caused by simultaneous insulation monitoring of multiple clusters is avoided.

[0022] (3) Power-on self-test module The power-on self-test module is used to detect the total voltage of each battery cluster and calculate the maximum voltage difference between clusters before the contactor closes. Based on the voltage difference threshold, it triggers inter-cluster circulating current equalization or prevents the contactor from closing.

[0023] The power-on self-test module further includes a voltage acquisition unit, a differential voltage comparison unit, an over-limit alarm unit, and a balancing control unit. The voltage acquisition unit acquires the total voltage of each parallel battery cluster before the contactor closes. The differential voltage comparison unit calculates the maximum inter-cluster voltage difference and compares it with a first differential voltage threshold and a second differential voltage threshold, where the first differential voltage threshold is greater than the second differential voltage threshold. The over-limit alarm unit prevents the contactor from closing and issues an over-limit alarm when the maximum inter-cluster voltage difference is greater than or equal to the first differential voltage threshold. The balancing control unit controls the circulating current balancing contactor to engage when the maximum inter-cluster voltage difference is greater than or equal to the second differential voltage threshold and less than the first differential voltage threshold, initiating inter-cluster circulating current balancing until the maximum inter-cluster voltage difference is less than the second differential voltage threshold, at which point the contactor closes.

[0024] The power-on self-test module's power-on self-test process is as follows: Upon power-on, the total voltage of each parallel battery cluster is collected before the contactor closes; the maximum voltage difference between clusters is calculated and compared with a first voltage difference threshold (e.g., 20V) and a second voltage difference threshold (e.g., 10V); if the maximum voltage difference between clusters is ≥ the first voltage difference threshold, the contactor is prohibited from closing and a voltage difference over-limit alarm is issued, awaiting manual intervention to eliminate the voltage difference fault; if the maximum voltage difference between clusters is ≥ the second voltage difference threshold and the maximum voltage difference between clusters is < the first voltage difference threshold, the circulating current equalization contactor is controlled to close, and the circulating current equalization between clusters is initiated until the maximum voltage difference between clusters is < the second voltage difference threshold, at which point the contactor closes.

[0025] (4) Protection and control module The protection and control module includes circuit breaker and fuse protection circuits and status feedback circuits.

[0026] The circuit breaker and fuse protection circuit includes a main circuit breaker and a fuse connected in series in the connection path between the battery pack and the PCS, providing dual overcurrent protection. The fuse's melting time is shorter than the contactor's contacting time, so the fuse melts first while the contactor remains uncontaminated. The main circuit breaker interrupts small short-circuit currents, while the fuse interrupts large short-circuit currents. The larger the short-circuit current, the faster the melting time, thus protecting the main circuit breaker and avoiding the hassle of replacing it. The main circuit breaker is also equipped with a shunt trip unit, which triggers the shunt trip of the main circuit breaker in the event of a serious fault, cutting off the high-voltage power supply.

[0027] The status feedback loop is used to collect contactor status signals, main circuit breaker status signals, fuse status signals, mains power failure fault feedback signals, and water immersion fault feedback signals to realize status feedback and fault linkage protection of main circuit electrical components. Specifically, the status feedback loop collects auxiliary contact signals from the main positive contactor, the main negative contactor, the main circuit breaker, the fuse, the mains power failure detection point, and the water immersion detection point, and feeds the collected auxiliary contact signals back to the main control unit to achieve closed-loop monitoring of the circuit status. When the contactor and main circuit breaker are in the open state, the auxiliary contacts of the main positive contactor, the main negative contactor, and the main circuit breaker are normally open; when the contactor and main circuit breaker are in the closed state, the auxiliary contacts of the main positive contactor, the main negative contactor, and the main circuit breaker are normally closed; when the fuse blows, the fuse auxiliary contact switches to the normally open state; when a mains power failure or water immersion fault occurs, the mains power failure detection point auxiliary contact and the water immersion detection point auxiliary contact switch to the normally closed state. The main control unit can determine the operating status of each electrical component by reading the open / closed state of the auxiliary contacts.

[0028] (5) Power supply module The power module includes a dual power supply unit and a 24V power supply output unit.

[0029] The dual power supply unit is equipped with one DC / DC switching power supply and one AC / DC switching power supply. The DC / DC switching power supply draws power from the battery side, and the AC / DC switching power supply draws power from the 220V AC mains side. The output terminals of the two switching power supplies are connected in parallel through a common cathode diode to prevent reverse connection, so as to achieve dual redundancy and seamless switching, meet the national standard backup power requirements, and provide uninterrupted power to various modules of the system.

[0030] The 24V power supply output unit is equipped with two independent output interfaces. One is a critical load power supply interface for supplying power to critical loads such as BMS, EMS (energy management system), and fire protection, and the other is a non-critical load power supply interface for supplying power to non-critical loads such as fans and dehumidifiers.

[0031] The power module also includes a non-critical load management unit: when the external energy management system detects a mains power failure, it outputs a dry contact signal to the detection input terminal of the BMS. The detection input terminal of the BMS is associated with the non-critical load contactor, enabling the non-critical load contactor to disconnect and cut off the output of the non-critical load power supply interface. This can effectively prevent the non-critical load from consuming power for a long time, which would lead to long-term over-discharge of the battery and accelerate cell aging.

[0032] The power module supports black start functionality: when the PCS switches to off-grid operation mode and the mains power fails, the DC side circuit breaker of the high-voltage box is closed, and critical loads such as BMS and EMS draw power from the DC / DC switching power supply, forcibly engaging the contactor of the high-voltage circuit. The PCS outputs a stable AC voltage, providing initial power for the black start of subsequent equipment. This meets the requirements for autonomous startup in pure off-grid scenarios, has strong adaptability, and significantly reduces on-site commissioning time and the difficulty of emergency startup.

[0033] The integrated high-voltage box electrical control system of the energy storage system also integrates a multi-channel communication interface, supports CAN bus, RS485 bus and LAN Ethernet communication, is compatible with mains power failure feedback and water immersion feedback signal transmission, and can be adapted to two-level and three-level energy storage system architectures.

[0034] The energy storage system uses an integrated high-voltage box electrical control system that integrates the high-voltage main circuit module, insulation monitoring module, power-on self-test module, protection and control module, power supply module, and multi-channel communication interface into a single high-voltage box. This reduces the number of external cable connections, lowers electromagnetic interference and the probability of failure, and effectively improves system reliability.

[0035] The integrated high-voltage box electrical control system for energy storage systems provided by this invention has the following beneficial technical effects compared with the prior art: (1) Integrating all functional modules into a single high-voltage box reduces the number of external cable connections, lowers electromagnetic interference and the probability of failure, and effectively improves system reliability; (2) After the contactor is closed, only the PCS insulation test is performed, which completely solves the problem of conflict between the BMS and PCS insulation tests; (3) The power-on logic is reliable. The inter-cluster pressure difference detection and circulating current equalization mechanism before power-on control the inter-cluster pressure difference within the set range at the moment of power-on, effectively suppressing the inter-cluster circulating current. (4) The protection and feedback mechanism is perfect. It integrates dual overcurrent protection of main circuit breaker and fuse, shunt trip protection, insulation monitoring protection, power-on self-test protection, feedback of the on and off status of each electrical component (contactor, main circuit breaker and fuse) in the main circuit, and linkage monitoring of key fault points such as mains power failure and water immersion, etc., to realize full-process safety control of high voltage circuit from input to output, and greatly reduce the high voltage safety risk of the system. (5) The dual power supply seamless switching design ensures uninterrupted power supply to critical loads and sufficient power supply redundancy; the non-critical load management function avoids battery over-discharge, and the black start function meets the needs of off-grid and emergency backup power scenarios. (6) The multi-channel communication interface supports CAN bus, RS485 bus and LAN Ethernet communication, and is compatible with mains power failure feedback and water immersion feedback signal transmission. It also supports different levels of energy storage system architecture, and can adapt to various application scenarios without redesigning the hardware. It has strong scalability and reduces the cost of solution iteration.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent variations or modifications made within the scope of the claims should fall within the protection scope of the present invention.

Claims

1. An integrated high-voltage box electrical control system for an energy storage system, characterized in that, include: A high-voltage main circuit module is used to connect the battery cluster and the PCS. The high-voltage main circuit module is equipped with a contactor for controlling the on and off of the high-voltage main circuit module. The insulation monitoring module includes a BMS insulation detection unit and a PCS insulation detection unit. Before the contactor closes, the BMS insulation detection unit and the PCS insulation detection unit are activated simultaneously to perform insulation detection independently. After the contactor closes, the BMS insulation detection unit is turned off, and only the PCS insulation detection unit performs insulation detection. The power-on self-test module is used to detect the total voltage of each battery cluster and calculate the maximum voltage difference between clusters before the contactor closes. Based on the voltage difference threshold, it triggers inter-cluster circulating current equalization or prevents the contactor from closing. The protection and control module includes a circuit breaker and fuse protection circuit and a status feedback circuit. The circuit breaker and fuse protection circuit includes a main circuit breaker and a fuse connected in series in the connection path between the battery pack and the PCS. The melting time of the fuse is less than the contactor's sticking time. The status feedback circuit is used to collect contactor status signals, main circuit breaker status signals, fuse status signals, mains power failure feedback signals, and water immersion fault feedback signals to realize status feedback and fault linkage protection of main circuit electrical components. The power module includes one DC / DC switching power supply and one AC / DC switching power supply. The DC / DC switching power supply draws power from the battery side, and the AC / DC switching power supply draws power from the AC mains side. The output terminals of the two switching power supplies are connected in parallel after being protected against reverse connection by a common cathode diode.

2. The integrated high-voltage box electrical control system for energy storage systems according to claim 1, characterized in that, The insulation monitoring module also includes a polling scheduling unit, which is used to configure a unique address code for each cluster BMS in a multi-cluster parallel scenario, and to poll and execute the insulation monitoring of each cluster in the order of the address codes, with a polling period of no more than 10 minutes.

3. The integrated high-voltage box electrical control system for energy storage systems according to claim 1, characterized in that, The power-on self-test module further includes: The voltage acquisition unit is used to acquire the total voltage of each parallel battery cluster before the contactor closes; The pressure difference comparison unit is used to calculate the maximum pressure difference between clusters and compare the maximum pressure difference between clusters with a first pressure difference threshold and a second pressure difference threshold, wherein the first pressure difference threshold is greater than the second pressure difference threshold. The over-limit alarm unit is used to prevent the contactor from closing and issue an over-limit alarm when the maximum differential pressure between clusters is greater than or equal to the first differential pressure threshold. The equalization control unit is used to control the circulating current equalization contactor to engage and start inter-cluster circulating current equalization when the maximum inter-cluster pressure difference is greater than or equal to the second pressure difference threshold and less than the first pressure difference threshold, until the contactor closes when the maximum inter-cluster pressure difference is less than the second pressure difference threshold.

4. The integrated high-voltage box electrical control system for energy storage systems according to claim 1, characterized in that, The main circuit breaker is equipped with a shunt trip unit, which is used to trigger the shunt trip of the main circuit breaker in the event of a serious fault.

5. The integrated high-voltage box electrical control system for energy storage systems according to claim 4, characterized in that, The contactor includes a main positive contactor for controlling the connection and disconnection between the positive terminal of the battery cluster and the PCS, and a main negative contactor for controlling the connection and disconnection between the negative terminal of the battery cluster and the PCS; the contactor status signals are auxiliary contact signals of the main positive contactor and the auxiliary contact signals of the main negative contactor; the main circuit breaker status signal is an auxiliary contact signal of the main circuit breaker; the fuse status signal is an auxiliary contact signal of the fuse; the mains power failure feedback signal is an auxiliary contact signal of the mains power failure detection point; and the water immersion fault feedback signal is an auxiliary contact signal of the water immersion detection point.

6. The integrated high-voltage box electrical control system for energy storage systems according to claim 5, characterized in that, When the contactor and main circuit breaker are in the open state, the auxiliary contacts of the main positive contactor, the main negative contactor, and the main circuit breaker are normally open; when the contactor and main circuit breaker are in the closed state, the auxiliary contacts of the main positive contactor, the main negative contactor, and the main circuit breaker are normally closed; when the fuse blows, the fuse auxiliary contact switches to the normally open state; when a mains power failure or water immersion fault occurs, the mains power failure detection point auxiliary contact and the water immersion detection point auxiliary contact switch to the normally closed state.

7. The integrated high-voltage box electrical control system for energy storage systems according to claim 1, characterized in that, The power module also includes a 24V power supply output unit, which has two independent output interfaces: one for supplying power to critical loads and the other for supplying power to non-critical loads.

8. The integrated high-voltage box electrical control system for energy storage systems according to claim 7, characterized in that, The power module also includes a non-critical load management unit: when the external energy management system detects a mains power failure, it outputs a dry contact signal to the detection input terminal of the BMS. The detection input terminal of the BMS is associated with the non-critical load contactor, enabling the non-critical load contactor to disconnect and cut off the output of the non-critical load power supply interface.

9. The integrated high-voltage box electrical control system for energy storage systems according to claim 7, characterized in that, The power module supports black start function: when the mains power fails, the PCS switches to off-grid operation mode, closes the DC side circuit breaker of the high-voltage box, and the BMS and EMS draw power from the DC / DC switching power supply to forcibly close the contactor of the high-voltage main circuit module. The PCS outputs a stable AC voltage to provide initial power for the black start of subsequent equipment.

10. The integrated high-voltage box electrical control system for energy storage systems according to any one of claims 1-9, characterized in that, The integrated high-voltage box electrical control system of the energy storage system also integrates a multi-protocol communication interface, supporting CAN bus, RS485 bus and LAN Ethernet communication.

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