Linkage logic control method for 400kWh energy storage cabinet

Abstract

The invention discloses a linkage logic control method for a 400kWh energy storage cabinet, and relates to the technical field of energy storage system control, and the method comprises the steps: 1, information collection, 2, linkage control processing, 3, response execution, multi-dimensional data collection, direct cell data collection by a battery management system (BMS) to ensure accuracy, and active state transmission by an energy storage converter PCS. Fire-fighting key alarm realizes millisecond-level response through dry contact direct connection, provides accurate data for linkage control, avoids errors caused by information problems, improves safety through various strategy regulation and control, generates derating or zeroing instructions to prevent fault expansion, improves reliability through a three-level decision mechanism, accurately responds to temperature and fire-fighting alarm, facilitates troubleshooting through log records, and is suitable for popularization and application. Instruction landing and collaboration are ensured, a physical signal display state is converted, key instruction priority is guaranteed, fire extinguishing response is optimized, energy efficiency is improved through multi-mode collaboration, and control logic efficiency is exerted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage system control, in particular to a linkage logic control method of a 400kWh energy storage cabinet. BACKGROUND

[0002] The current industrial and commercial energy storage integrated cabinet has the following problems in linkage control: the energy storage system lacks deep cooperation with photovoltaic, load and other devices, it is difficult to dynamically optimize energy scheduling strategy, leading to reduced comprehensive energy efficiency, the communication protocols of different devices are greatly different, the data interaction delay is high, which affects the real-time control accuracy, the fire control system and the energy storage management system lack cooperation, and the response time from thermal runaway early warning to fire extinguishing execution exceeds the safety threshold.

[0003] To solve the problems in the prior art, the present application provides a control logic based on a local comprehensive controller and data interaction between different devices in an industrial and commercial energy storage integrated cabinet to complete control linkage, forming a complete protection scheme to protect the battery cells and the devices in the cabinet and avoid device damage caused by fault escalation. SUMMARY

[0004] The purpose of the present application is to provide a linkage logic control method of a 400kWh energy storage cabinet, which solves the problems in the background art.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: the present application provides a linkage logic control method of a 400kWh energy storage cabinet, step 1. Information collection: real-time collection of the maximum charging and discharging power of the battery management system BMS and the fuse state, the device running state and fault code of the energy storage converter PCS, the warning level of the liquid cooling host of the thermal management system TMS, and the alarm threshold signal of the package level detector of the fire host.

[0006] Step 2. Linkage control processing: the local controller LCU generates a linear derating or zeroing instruction, generates a device protection linkage instruction set according to the communication state characteristic value, generates a temperature regulation execution strategy by analyzing the warning level of the thermal management system, generates a fire extinguishing device activation logic sequence according to the alarm level signal, and records device data in real time to build a monitoring log.

[0007] Preferably, the local controller LCU generates a linear derating or zeroing instruction, specifically: according to the three-level fault parameters of the energy storage, the protection limit value is configured as a three-level value, and the protection inhibition value is set as a two-level value, wherein the limit value and the inhibition value are differentiated between the charging state and the discharging state, when the battery management system BMS monitors that the battery state reaches the preset charging or discharging limit value, the local controller LCU will generate a linear derating instruction to regulate the power of the energy storage inverter PCS to linearly decrease from the current value to the safe power at a fixed slope, if the battery state parameter further deteriorates to the charging or discharging inhibition value, the local controller LCU immediately generates a zeroing instruction to force the power of the energy storage inverter PCS to zero to achieve emergency stop protection.

[0008] Preferably, the local controller LCU generates a linear derating or zeroing instruction, specifically: according to the three-level fault parameters of the energy storage, the protection limit value is configured as a three-level value, and the protection inhibition value is set as a two-level value, wherein the limit value and the inhibition value are differentiated between the charging state and the discharging state, when the battery management system BMS monitors that the battery state reaches the preset charging or discharging limit value, the local controller LCU will generate a linear derating instruction to regulate the power of the energy storage inverter PCS to linearly decrease from the current value to the safe power at a fixed slope, if the battery state parameter further deteriorates to the charging or discharging inhibition value, the local controller LCU immediately generates a zeroing instruction to force the power of the energy storage inverter PCS to zero to achieve emergency stop protection.

[0009] Preferably, the local controller LCU generates a linear derating or zeroing instruction, specifically: according to the three-level fault parameters of the energy storage, the protection limit value is configured as a three-level value, and the protection inhibition value is set as a two-level value, wherein the limit value and the inhibition value are differentiated between the charging state and the discharging state, when the battery management system BMS monitors that the battery state reaches the preset charging or discharging limit value, the local controller LCU will generate a linear derating instruction to regulate the power of the energy storage inverter PCS to linearly decrease from the current value to the safe power at a fixed slope, if the battery state parameter further deteriorates to the charging or discharging inhibition value, the local controller LCU immediately generates a zeroing instruction to force the power of the energy storage inverter PCS to zero to achieve emergency stop protection.

[0010] Preferably, the fire-fighting device activation logic sequence is generated according to the alarm level signal, and the specific method is as follows: when the fire host detects that the package level detector alarm signal reaches the preset first level alarm threshold, the fire host passively transmits the alarm information to the local controller LCU for early warning log recording through the RS485 protocol; when the alarm signal reaches the preset second level alarm threshold, the fire host immediately starts the exhaust valve to strengthen heat dissipation and outputs the fire warning signal to the local database LCU through the dry contact signal, the local controller LCU controls the energy storage converter PCS to execute power zero, and the cabinet door fault signal lamp is lit, and the second level alarm signal can be passively read through the RS485 protocol; when the alarm signal breaks through the preset third level alarm threshold, the fire host closes the exhaust valve, sends the fire warning instruction to the local controller LCU through the dry contact signal, starts the exclusive explosion suppression valve of the fault battery pack, and after a preset safety delay, the perfluorohexanone fire extinguishing device is linked to spray fire extinguishing agent to suppress the thermal runaway battery PACK, and the fire extinguishing device feedback state signal to the fire host, the local controller LCU receives the second or third level alarm dry contact signal to force the high-voltage box circuit breaker to trip to realize electrical isolation, and form a closed-loop safety logic sequence with millisecond-level response.

[0011] Preferably, the real-time recording device data constructs a monitoring log, and the specific method is as follows: the local controller LCU collects the maximum charge and discharge power and the fuse state of the battery management system BMS, the device running state and fault code of the energy storage converter PCS, the liquid cooling host warning level of the thermal management system TMS, and the package level detector alarm threshold signal of the fire host in real time through the RS485 protocol and the dry contact signal channel, and the local controller LCU adds a time stamp to the collected multi-source data at a preset sampling period and writes it into the internal non-volatile memory to construct a structured monitoring log. When the local controller LCU detects that the device parameter exceeds the dynamic safety threshold stored in the local database, it triggers a warning record, and the local controller LCU automatically appends action sequence details in the fire linkage or energy storage converter PCS derating event, ensuring that the log covers the entire link event from data collection to response execution.

[0012] Step 3. Response execution: convert the control instruction into a physical signal to drive the state indication device, solve the protocol conflict of the energy storage system, optimize the fire extinguishing response, and realize the multi-modal collaborative response mechanism.

[0013] Preferably, the conversion control instruction is a physical signal driving state indication device, and the specific method is that the local controller LCU converts the internally generated control instruction into a physical level signal through a digital output signal channel to directly drive the panel state indication device, including a green running indication lamp, a yellow warning indication lamp, and a red fault indication lamp. When the local controller LCU detects that the equipment communication interruption exceeds the preset communication interruption threshold value, the local controller LCU outputs a high-level DO signal to light the red fault indication lamp. When the local controller LCU parses the derating operation code, the local controller LCU outputs a pulse DO signal to light the yellow warning indication lamp. When the local controller LCU triggers the second or third alarm of the fire fighting system, the cabinet door fault signal lamp is lit through the DO signal linkage. All DO signals are transmitted stably through an optical coupling isolation circuit, and the state of the indication device is fed back to the local controller LCU in real time to form a closed-loop monitoring.

[0014] Preferably, the protocol conflict of the energy storage system is solved, and the specific method is that the local controller LCU normally operates the RS485 polling communication cycle, collects BMS, PCS, and TMS data through the Modbus-RTU protocol, and when the hard-wire signal of the fire host main contact triggers the second or third alarm, the INT0 interrupt pin of the LCU immediately responds, and the interrupt service program performs three actions: saves the current RS485 communication field to a double-buffered memory, forcibly switches to a hardware interrupt response mode, suspends all non-fire related communications, directly executes the fire linkage instruction set through a physical isolation circuit, automatically restores the RS485 communication field before the interruption after the fire alarm is removed, and supplements the missing data packet based on a timestamp alignment mechanism to improve the fire response time.

[0015] Preferably, the fire extinguishing response is optimized, and the specific method is that the safety delay time is set as , wherein is a preset safety delay time, is a thermal runaway sensitivity coefficient, is a cooling liquid temperature rise rate. When the cooling liquid temperature rise rate exceeds a preset cooling liquid temperature rise rate threshold value, the safety delay time will speed up the response. If the pressure drop rate of the explosion suppression valve is continuously monitored to be greater than a preset threshold value during the safety delay time, the delay is immediately interrupted, and the perfluorohexanone fire extinguishing device is directly started to spray, thereby optimizing the response time in the slow-release thermal runaway scene and improving the explosion suppression success rate.

[0016] Preferably, the multi-modal synergistic response mechanism, specifically: the local controller LCU collects photovoltaic system and load data in real time through an extended communication interface, constructs a synergistic decision matrix with BMS and PCS state data, activates the maximum power charging strategy when high photovoltaic output is identified and high state of charge of energy storage is superimposed, executes power linear derating control and intensified cooling of thermal management when the PCS inverter PCS overheats and the photovoltaic fluctuates violently, ensures real-time transmission of instructions through a protocol conflict resolution mechanism, and forms a closed-loop optimization by feeding back the execution results to the monitoring log system.

[0017] The beneficial effects of the present application are: (1) The first part of the present application: multi-dimensional data collection, accurate battery management system BMS direct sampling of cell data, active transmission of PCS state, millisecond-level response of fire key alarm through dry contact direct connection, providing accurate data for linkage control and avoiding information problems leading to errors.

[0018] (2) The second part of the present application: through multi-strategy regulation, generate derating or zero instruction to prevent fault expansion, three-level decision mechanism to improve safety, accurately respond to temperature and fire alarm, log record for easy troubleshooting, and improve reliability.

[0019] (3) The third part of the present application: ensure that the instruction is implemented and synergistic, convert physical signals to display the state, ensure that the key instruction is prioritized, optimize the fire extinguishing response, multi-modal synergy to improve energy efficiency, and exert the control logic efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 The method flowchart of the present application.

[0022] Figure 2 The communication wiring diagram in the energy storage cabinet of the present application.

[0023] Figure 3 The linkage logic flowchart of the present application.

[0024] Figure 4 The fire control logic diagram of the present application. DETAILED DESCRIPTION

[0025] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0026] Referring to Figure 1 As shown in the drawings, the present application provides a linkage logic control method for a 400 kWh energy storage cabinet, comprising: step 1. Information collection: real-time collection of maximum energy storage charge and discharge power of a battery management system BMS, equipment operating state and fault code of an energy storage converter PCS, liquid cooling host warning level of a thermal management system TMS, and alarm threshold signal of a package level detector of a fire-fighting host.

[0027] In one specific embodiment, the battery management system BMS collects raw data directly attached to the battery cell through internal voltage or current sensors and temperature probes, and calculates the maximum energy storage charge and discharge power through its built-in algorithm. At the same time, the high-voltage box fuse state is captured by the BMS digital input port to capture the switching value signal. The energy storage converter PCS generates the operating state and fault code in real time through its own temperature sensor and AC side voltage detection module, and actively uploads them to the local controller LCU through the RS485 protocol. The liquid cooling host warning level of the thermal management system TMS is sensed in real time by the cooling liquid temperature sensor, flow meter and compressor state monitor, and transmitted to the LCU through the Modbus-RTU protocol. The alarm threshold signal of the package level detector of the fire-fighting host is transmitted in parallel through the physical dry contact channel and the RS485 double link, wherein the first level alarm is passively read by the RS485, and the second or third level alarm is directly connected to the LCU digital input port through the dry contact hard wire, ensuring millisecond-level response.

[0028] It should be noted that the package level detector is a multi-parameter fusion sensor installed directly in the battery package level in the fire-fighting system, which is used to monitor the thermal runaway signs of a single battery package in real time.

[0029] Step 2. Linkage control processing: the local controller LCU generates a linear derating or zeroing instruction, generates a device protection linkage instruction set according to the communication state characteristic value, generates a temperature regulation execution strategy by analyzing the warning level of the thermal management system, generates a fire-fighting device activation logic sequence according to the alarm level signal, and records device data in real time to build a monitoring log.

[0030] In specific embodiments of the present application, the local controller LCU generates a linear derating or zeroing instruction, specifically by configuring the protection limit value as a three-level value and the protection inhibition value as a two-level value according to the three-level fault parameters of the energy storage, wherein the limit value and the inhibition value are differentiated between the charging state and the discharging state, and when the battery management system BMS detects that the battery state reaches the preset charging or discharging limit value, the local controller LCU generates a linear derating instruction to regulate the power of the energy storage inverter PCS to linearly decrease from the current value to the safe power at a fixed slope, and if the battery state parameter further deteriorates to the charging or discharging inhibition value, the local controller LCU immediately generates a zeroing instruction to force the power of the energy storage inverter PCS to zero to achieve emergency stop protection.

[0031] It should be noted that all the regulation thresholds are derived from the three-level fault parameters of the battery uploaded by the battery management system BMS in real time.

[0032] It should also be noted that the power reduction slope in the derating process is determined by the difference between the current power value and the safe power threshold and the preset adjustment time.

[0033] For example, when the energy storage charging reaches the limit value, the local controller LCU regulates the energy storage inverter PCS to start linearly reducing the charging power, and when the parameter reaches the inhibition value, the local controller LCU immediately sets the energy storage power to 0.

[0034] Referring to Figure 3 In specific embodiments of the present application, the local controller LCU generates a device protection linkage instruction set according to the communication state characteristic values, specifically by analyzing the three types of characteristic values of the device disconnection flag, the fault code word and the signal quality intensity uploaded by the energy storage inverter PCS in real time, and generating an instruction set using a three-level decision mechanism: when the local controller LCU detects that the PCS communication interruption exceeds the preset time threshold, it immediately responds to the communication interruption, i.e., triggers the battery management system BMS to perform emergency power-off through the dry contact DO signal, and lights up the cabinet fault indicator light, when the local controller LCU analyzes that the PCS fault code contains a specific derating identifier, it immediately responds to the derating operation, i.e., automatically sends a power limiting instruction to the PCS to the safe power threshold, and starts the thermal management system TMS in the strong cooling mode, when the local controller LCU identifies that the PCS fault code contains a fatal fault identifier, it immediately responds to the fatal fault, i.e., through a high-voltage pulse to instantaneously disconnect the circuit, activates the fire main isolation plan, and blocks the PCS enable signal.

[0035] It should be noted that the device disconnection flag represents the communication connection state of the energy storage inverter PCS and the local database LCU, and the fault code word contains the device operating state code and the signal quality intensity, which are signal stability parameters obtained through the RS458 communication quality detection module.

[0036] It should be noted that the specific derating identifier is a predefined binary flag stored in the energy storage inverter fault code, indicating that the device needs to enter a power limited operation state.

[0037] It should also be noted that the fatal fault identifier is a preset highest risk binary flag in the energy storage inverter fault code, indicating that the device has an irreversible hardware damage or a fault state that may trigger an interlocked safety accident.

[0038] In a specific embodiment of the present application, the temperature regulation execution strategy is generated by analyzing the warning level of the thermal management system, and the specific method is: the local controller LCU obtains the liquid cooling host warning level signal uploaded by the thermal management system TMS in real time through the RS485 protocol, and the cooling liquid temperature rise rate, flow deviation and compressor load rate of the liquid cooling host stored in the database are weighted and summed to set the liquid cooling host warning level threshold. If the local controller LCU identifies that the liquid cooling host is a first warning threshold or a second warning threshold, the local controller LCU immediately links the energy storage inverter PCS to stop and records the stop event to the monitoring log. When the local controller LCU detects that the liquid cooling host is a third warning threshold, the local controller LCU maintains the current running state of the liquid cooling unit TMS and pushes the warning signal containing the fault code to the monitoring platform, and triggers the sound and light alarm device.

[0039] The characteristic values of the influence parameters of the liquid cooling host are normalized and weighted and summed to obtain the characteristic parameters of the influence parameters of the liquid cooling host. The weighted sum is specifically to multiply the characteristic parameters of the influence parameters of the liquid cooling host warning level threshold by the corresponding weight coefficients and then add them. The weight coefficients corresponding to the characteristic parameters of the influence parameters are specifically obtained from the local database. The weight coefficients of the characteristic parameters of the influence parameters reflect the influence degree and influence direction of the characteristic parameters of the influence parameters on the liquid cooling host warning level threshold. The influence direction includes positive influence and negative influence.

[0040] For example, taking the characteristic parameters of the influence parameters of a certain liquid cooling host warning level threshold as the cooling liquid temperature rise rate , flow deviation and compressor load rate , wherein the cooling liquid temperature rise rate has the largest influence degree and the influence direction is positive, the flow deviation and the compressor load rate have moderate influence degree and the influence direction is positive, then the weight coefficients corresponding to the cooling liquid temperature rise rate, the flow deviation and the compressor load rate can be set as 0.5, 0.2 and 0.2 respectively, and the influence characteristic parameters of the liquid cooling host warning level threshold are .

[0041] Referring to Figure 4As shown, in specific embodiments of the present application, the fire-fighting device activation logic sequence is generated according to the alarm level signal, and the specific method is as follows: when the fire host detects that the pack-level detector alarm signal reaches the preset first-level alarm threshold, the fire host passively transmits the alarm information to the local controller LCU through the RS485 protocol for early warning log recording; when the alarm signal reaches the preset second-level alarm threshold, the fire host immediately starts the inlet and outlet valve to strengthen heat dissipation and outputs the fire warning signal to the local database LCU through the dry contact signal, the local controller LCU controls the energy storage converter PCS to execute power zero, and the cabinet door fault signal light is lit, and the second-level alarm signal can be passively read through the RS485 protocol; when the alarm signal breaks through the preset third-level alarm threshold, the fire host closes the inlet and outlet valve, sends the fire warning instruction to the local controller LCU through the dry contact signal, starts the exclusive explosion suppression valve of the fault battery pack, and after a preset safety delay, the perfluorohexanone fire extinguishing device is linked to spray fire extinguishing agent to suppress the thermal runaway battery PACK, and the fire extinguishing device feedback state signal to the fire host, the local controller LCU receives the second or third level alarm dry contact signal to force the high-voltage box circuit breaker to trip to realize electrical isolation, and form a closed-loop safety logic sequence with millisecond-level response.

[0042] It should be noted that the RS485 protocol builds an anti-interference, multi-node industrial-level communication backbone between the BMS, PCS, TMS and fire host, realizes millisecond-level real-time data transmission, provides accurate decision basis for the linkage control of LCU, and solves the long-distance communication interference problem through differential signal and bus architecture.

[0043] Exemplarily, the preset safety delay is 30 seconds.

[0044] Referring to Figure 2 As shown, in specific embodiments of the present application, the real-time device data is recorded to construct a monitoring log, and the specific method is as follows: the local controller LCU collects the maximum charging and discharging power and the fuse state of the battery management system BMS uploaded in real time, the device running state and fault code of the energy storage converter PCS, the liquid cooling host warning level of the thermal management system TMS, and the pack-level detector alarm threshold signal of the fire host through the RS485 protocol and the dry contact signal channel, the local controller LCU adds time stamp to the collected multi-source data with a preset sampling period and writes it into the internal non-volatile memory to construct a structured monitoring log, and when the local controller LCU detects that the device parameter exceeds the dynamic safety threshold stored in the local database, a warning record is triggered, and the local controller LCU automatically appends the action sequence details in the fire linkage or the energy storage converter PCS derating event, ensuring that the log covers the full-link event from data collection to response execution.

[0045] Step 3. Response execution: convert the control instruction into a physical signal driving state indication device, solve the energy storage system protocol conflict, optimize the fire extinguishing response, and realize the multi-modal collaborative response mechanism.

[0046] In a specific embodiment of the present application, the conversion control instruction is a physical signal driving state indication device, and the specific method is as follows: the local controller LCU converts the internally generated control instruction into a physical level signal through a digital output signal channel to directly drive the panel state indication device, including a green running indicator, a yellow warning indicator, and a red fault indicator. When the local controller LCU detects that the equipment communication interruption exceeds the preset communication interruption threshold, the local controller LCU outputs a high-level DO signal to light the red fault indicator. When the local controller LCU parses the reduced capacity running code, the local controller LCU outputs a pulse DO signal to light the yellow warning indicator. When the local controller LCU triggers a secondary or tertiary alarm in the fire extinguishing system, the DO signal is linked to light the cabinet door fault signal lamp. All DO signals are transmitted stably through an optical coupling isolation circuit, and the state of the indication device is fed back to the local controller LCU in real time to form a closed-loop monitoring.

[0047] It should be noted that the type and color mapping strategy of the indicator is dynamically configured based on a preset fault classification table to avoid specific numerical limitations, such as the communication interruption threshold being generated by a system preset adjustable parameter rather than a fixed time value.

[0048] The control instruction is a fault shutdown, reduced capacity running, or fire fighting linkage instruction.

[0049] In a specific embodiment of the present application, the solution to the energy storage system protocol conflict is as follows: the local controller LCU runs a RS485 polling communication cycle normally, collects BMS, PCS, and TMS data through the Modbus-RTU protocol, and when the secondary or tertiary alarm is triggered by the fire host hard-wired signal, the INT0 interrupt pin of the LCU responds immediately, and the interrupt service program performs three actions: saves the current RS485 communication field to a double buffer memory, forcibly switches to a hardware interrupt response mode, suspends all non-fire related communications, executes the fire fighting linkage instruction set through a physical isolation circuit, and automatically restores the RS485 communication field before the interruption after the fire alarm is removed. Based on the timestamp alignment mechanism, the missing data packets are supplemented to improve the fire response time.

[0050] It should be noted that the Modbus-RTU protocol is a communication backbone for realizing multi-device data interaction and is the core carrier of data communication. Through an efficient and reliable serial transmission mechanism, seamless integration of thermal management, device monitoring, and fire fighting linkage is realized.

[0051] In a specific embodiment of the present application, the optimization of the fire extinguishing response is as follows: a safety delay is added to the fire extinguishing response to ensure that the fire extinguishing system has enough time to respond to the fire. wherein is a preset safety delay length, is a thermal runaway sensitive coefficient, is a coolant temperature rise rate, when the coolant temperature rise rate exceeds a preset coolant temperature rise rate threshold, the safety delay length will respond to speed up, if the pressure drop rate of the explosion suppression valve is continuously monitored to be greater than the preset threshold during the safety delay length counting, the delay is immediately interrupted and the perfluorohexanone fire extinguishing device is directly started to spray, the response time in the slow-release thermal runaway scene is optimized, and the explosion suppression success rate is improved.

[0052] In a specific embodiment of the application, the multi-modal cooperative response mechanism specifically comprises: a local controller LCU collects photovoltaic system and load data in real time through an extended communication interface, constructs a cooperative decision matrix with BMS and PCS state data, activates a maximum power charging strategy when identifying photovoltaic high output superimposed on high state of charge of energy storage, executes power linear derating control and thermal management intensive cooling in linkage when detecting overheat of the energy storage converter PCS and severe fluctuations of photovoltaic, ensures real-time transmission of instructions through a protocol conflict resolution mechanism, and feeds back execution results to a monitoring log system to form a closed-loop optimization.

[0053] It should be noted that photovoltaic high output is a state of power output of a photovoltaic power generation system reaching or approaching a maximum power point under external environmental factors.

[0054] It should also be noted that the high state of charge of energy storage refers to an operating state in which the battery system stores power close to its safe upper limit.

[0055] The activated maximum power charging strategy is to maximize the use of photovoltaic energy to charge the energy storage battery within the charging limit value, avoiding light loss.

[0056] The above formulas can convert physical quantities of different properties into unitless standard values or same-dimension superimposable parameters through the principle of dimensional consistency and mathematical standardization, thereby eliminating the interference of different dimensions on the operation logic, making the formula retain the original data distribution characteristics while having mathematical operation rationality and objective law adaptability. The above is only an exemplary embodiment of the application, and cannot limit the scope of the application.

[0057] For example, through the principle of dimensional consistency and mathematical standardization, such as normalization processing, dimensionless parameter conversion, or unit system unification.

[0058] The above content is only an example and description of the concept of the application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the concept of the application or exceed the scope defined by the application.

Claims

1. A linkage logic control method of a 400 kWh energy storage cabinet, characterized in that, The application relates to a local controller LCU for a battery energy storage system, and belongs to the field of energy storage system control. Step 1. Information collection: real-time collection of maximum charging and discharging power of a battery management system BMS, a fuse state, a device running state and a fault code of a power conversion system PCS, a warning level of a liquid cooling host of a thermal management system TMS, and a package level detector alarm threshold signal of a fire-fighting host; Step 2. Linkage control processing: the local controller LCU generates a linear derating or zeroing instruction, generates a device protection linkage instruction set according to a communication state characteristic value, generates a temperature regulation execution strategy by analyzing a thermal management system warning level, generates a fire-fighting device activation logic sequence according to an alarm level signal, and records device data in real time to construct a monitoring log; Step 3. Response execution: converting the control instruction into a physical signal to drive a state indicating device, solving a storage system protocol conflict, optimizing fire extinguishing response, and a multi-modal collaborative response mechanism.

2. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 1, characterized in that, The local controller LCU generates a linear derating or zeroing instruction, and the specific method is as follows: According to three-level fault parameters of the energy storage, a protection limit value is configured as a three-level value, and a protection inhibition value is set as a two-level value, wherein the limit value and the inhibition value are distinguished between a charging state and a discharging state; when the battery management system BMS monitors that a battery state reaches a preset charging or discharging limit value, the local controller LCU generates a linear derating instruction to control the power of the power conversion system PCS so that the power is linearly decreased from a current value to a safe power at a fixed slope; if the battery state parameter is further deteriorated to the charging or discharging inhibition value, the local controller LCU immediately generates a zeroing instruction to force the power of the power conversion system PCS to be zero to realize emergency stop protection.

3. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 1, characterized in that, The local controller LCU generates a device protection linkage instruction set according to a communication state characteristic value, and the specific method is as follows: The local controller LCU analyzes three types of characteristic values, including a device disconnection flag, a fault code word and a signal quality strength, which are uploaded by the power conversion system PCS, and generates an instruction set by adopting a three-level decision mechanism: when the local controller LCU detects that PCS communication interruption exceeds a preset time threshold, communication interruption response is immediately performed, that is, the battery management system BMS is triggered to perform emergency power-off through a dry contact DO signal, and a cabinet fault indicating lamp is lighted; when the local controller LCU analyzes that the PCS fault code contains a specific derating identifier, derating operation response is immediately performed, that is, a power limiting instruction is automatically sent to the PCS to the safe power threshold, and a strong cooling mode of the thermal management system TMS is started; when the local controller LCU identifies that the PCS fault code contains a fatal fault identifier, fatal fault response is immediately performed, that is, a high-voltage pulse is used to instantaneously disconnect the circuit, a fire-fighting host isolation plan is activated, and a PCS enable signal is blocked.

4. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 1, characterized in that, The local controller LCU generates a temperature regulation execution strategy by analyzing a thermal management system warning level, and the specific method is as follows: The local controller LCU obtains the liquid cooling host warning level signal uploaded by the thermal management system TMS in real time through the RS485 protocol, weights and sums the cooling liquid temperature rise rate, flow deviation and compressor load rate of the liquid cooling host stored in the database to set the liquid cooling host warning level threshold, and if the local controller LCU identifies that the liquid cooling host is at a first warning threshold or a second warning threshold, the local controller LCU immediately links the energy storage converter PCS to stop and records the stop event to the monitoring log, and when the local controller LCU detects that the liquid cooling host is at a third warning threshold, the local controller LCU maintains the current running state of the liquid cooling unit TMS and pushes the warning signal containing the fault code to the monitoring platform, and triggers the audible and light alarm device.

5. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 1, characterized in that, The method for generating the fire extinguishing device activation logic sequence according to the alarm level signal is specifically as follows: When the fire host detects that the package level detector alarm signal reaches a preset first alarm threshold, the fire host passively transmits the alarm information to the local controller LCU through the RS485 protocol for early warning log recording, when the alarm signal reaches a preset second alarm threshold, the fire host immediately starts the air inlet and outlet valve to strengthen heat dissipation and outputs the fire warning signal to the local database LCU through the dry contact signal, the local controller LCU controls the energy storage converter PCS to execute power zero and lights up the cabinet door fault signal lamp, and at the same time, the second alarm signal can be passively read through the RS485 protocol, when the alarm signal breaks through the preset third alarm threshold, the fire host closes the air inlet and outlet valve, sends the fire warning instruction to the local controller LCU through the dry contact signal, starts the exclusive explosion suppression valve of the fault battery pack, and after a preset safety delay, links the perfluorohexanone fire extinguishing device to spray fire extinguishing agent to suppress the thermal runaway battery PACK, and at the same time, the fire extinguishing device feedback state signal to the fire host, the local controller LCU receives the second or third alarm dry contact signal to force the high-voltage box circuit breaker to trip to realize electrical isolation, and form a closed-loop safety logic sequence with millisecond-level response.

6. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 1, characterized in that, The method for recording the equipment data in real time to construct the monitoring log is specifically as follows: The local controller LCU collects the maximum charging and discharging power and the fuse state of the energy storage, the equipment running state and fault code of the energy storage converter PCS, the liquid cooling host warning level of the thermal management system TMS and the package level detector alarm threshold signal of the fire host in real time through the RS485 protocol and the dry contact signal channel, the local controller LCU adds time stamp to the collected multi-source data at a preset sampling period and writes it into the internal non-volatile memory to construct a structured monitoring log, and when the local controller LCU detects that the equipment parameter exceeds the dynamic safety threshold stored in the local database, the pre-warning record is triggered, and the local controller LCU automatically appends the action sequence details in the fire linkage or the energy storage converter PCS derating event to ensure that the log covers the whole link event from data collection to response execution.

7. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 5, characterized in that, The method for converting the control instruction into a physical signal driving state indication device is specifically as follows: The local controller LCU converts the internally generated control instructions into physical level signals through a digital output signal channel to directly drive the panel state indication device, including a green running indicator, a yellow warning indicator and a red fault indicator. When the local controller LCU detects that the equipment communication interruption exceeds the preset communication interruption threshold, the local controller LCU outputs a high-level DO signal to light the red fault indicator. When the local controller LCU parses the reduced capacity operation code, the local controller LCU outputs a pulse DO signal to light the yellow warning indicator. When the local controller LCU triggers the second or third alarm of the fire fighting system, the cabinet door fault signal lamp is lighted through the DO signal linkage. All DO signals are transmitted stably through an optical coupling isolation circuit, and the state of the indication device is fed back to the local controller LCU in real time to form a closed loop monitoring.

8. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 5, characterized in that, The protocol conflict of the energy storage system is solved, and the specific method is as follows: The local controller LCU normally operates the RS485 polling communication cycle, collects BMS, PCS and TMS data through the Modbus-RTU protocol, and when the hard-wired signal of the fire host trigger is triggered, the INT0 interrupt pin of the LCU immediately responds, and the interrupt service program performs three actions: saves the current RS485 communication field to the double buffer memory, forcibly switches to the hardware interrupt response mode, suspends all non-fire related communications, directly executes the fire linkage instruction set through the physical isolation circuit, and automatically restores the RS485 communication field before the interruption after the fire alarm is removed. Based on the timestamp alignment mechanism, the missing data packets are supplemented, and the fire response time is improved.

9. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 5, characterized in that, The fire extinguishing response is optimized, and the specific method is as follows: through a safety delay time wherein is a preset safety delay time, is a thermal runaway sensitive coefficient, is a coolant temperature rise rate, when the coolant temperature rise rate exceeds a preset coolant temperature rise rate threshold, the safety delay time will respond to speed up, if the pressure drop rate of the explosion suppression valve is continuously monitored during the safety delay time counting period to be greater than the preset threshold, the delay is immediately interrupted and the perfluorocyclohexanone fire extinguishing device is directly started to spray, which optimizes the response time in the slow-release thermal runaway scene and improves the explosion suppression success rate.

10. The linkage logic control method of a 400 kWh energy storage cabinet according to claim 1, characterized in that, The multi-modal collaborative response mechanism is provided, and the specific method is as follows: The local controller LCU collects photovoltaic system and load data in real time through an extended communication interface, constructs a collaborative decision matrix with BMS and PCS state data, activates the maximum power charging strategy when high output of photovoltaic and high state of charge of energy storage are identified, and executes power linear derating control and heat management intensive cooling when the PCS overheat and the photovoltaic fluctuate violently. Through the protocol conflict resolution mechanism, the instruction is transmitted in real time, and the execution result is fed back to the monitoring log system to form a closed loop optimization.

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