Energy storage integrated cabinet control system

Abstract

The present invention discloses an integrated energy storage cabinet control system, comprising an AC junction box, N energy storage sub-cabinets, a cloud server and a terminal APP; each energy storage sub-cabinet is connected to the power grid and the power load through the AC junction box; the AC junction box comprises an iEMS and a switch, an electric energy meter, a main circuit breaker and N sub-circuit breakers respectively connected to the iEMS; the iEMS has an energy management function, can collect AC power before and after multiple grid connection points, and adjust energy in real time according to the demand plan set by the user through the terminal APP and sent to the iEMS through the cloud server, the battery status of the corresponding energy storage battery sent by the BMS of each energy storage sub-cabinet, and the real-time grid-connected power status, thereby generating control instructions for different power requirements and sending them to the PCS of the corresponding energy storage sub-cabinet.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an integrated energy storage cabinet control system. Background Art

[0002] Energy storage devices are used in many situations to meet specific load requirements, such as providing stable power output in grid-connected mode. The load status of the battery pack can be managed by the host computer and other devices. In certain situations or time periods, a single energy storage device, due to its limited capacity, may not be able to meet the load requirements. When the original energy storage capacity increases, multiple devices are connected in parallel, achieving modular expansion through AC coupling to achieve the rated power that meets the load requirements.

[0003] Because both charging and discharging are performed through a single AC busbar, multi-unit parallel energy storage systems require a high degree of balanced energy distribution between devices. Existing technologies present certain problems and shortcomings. First, when multiple energy storage devices are connected in parallel, the battery packs of each device have different charge and discharge rates and attenuation levels. If power distribution is unbalanced, some devices may be operating at full load while others may be operating at low load, causing some devices to not function properly. Summary of the Invention

[0004] The object of the present invention is to provide an energy storage integrated cabinet control system that can effectively solve the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above objectives, one embodiment of the present invention provides an integrated energy storage cabinet control system, comprising an AC combiner cabinet, N energy storage sub-cabinets, a cloud server, and a terminal APP; each energy storage sub-cabinet is connected to the power grid and the power load through the AC combiner cabinet, the AC combiner cabinet is wirelessly connected to the cloud server, and the terminal APP is wirelessly connected to the cloud server;

[0006] The AC combiner cabinet includes an iEMS and a switch, an energy meter, a main circuit breaker, and N sub-circuit breakers, each of which is connected to the iEMS. One end of each of the N sub-circuit breakers is connected to one end of the main circuit breaker. One end of the main circuit breaker is used to connect the power grid and the load, and the other ends of the N sub-circuit breakers are respectively connected to a corresponding energy storage cabinet. The input end of the energy meter is placed between the main circuit breaker and the N sub-circuit breakers and is used to collect total energy information discharged by the energy storage cabinet to the grid or charged from the grid in grid-connected mode, and discharged to the load in off-grid mode.

[0007] Each of the energy storage sub-cabinets includes an energy storage battery, a BMS, a PCS, an energy storage meter and a communication interface; the BMS, PCS and energy storage meter are all connected to the communication interface, and the communication interface is also connected to the switch; the PCS is used to realize AC / DC conversion, the AC end of the PCS is connected to the other end of a circuit breaker of the AC combiner cabinet, and the DC end of the PCS is connected to the energy storage battery. The PCS receives control instructions from the iEMS through the communication interface and charges or discharges the energy storage battery according to the control instructions; the BMS is connected to the energy storage battery to obtain status information of the energy storage battery, and sends the acquired status information of the energy storage battery to the iEMS through the communication interface; the energy storage meter is used to collect electric energy information of the corresponding energy storage sub-cabinet discharging to the grid or charging from the grid in grid-connected mode and discharging to the load in off-grid mode and sends it to the iEMS through the communication interface;

[0008] The iEMS has an energy management function and can collect the power before and after the AC measurement of multiple grid-connected points, and adjust the energy in real time according to the demand plan set by the user through the terminal APP and sent to the iEMS through the cloud server, the battery status of the corresponding energy storage battery sent by the BMS of each energy storage cabinet, and the real-time grid-connected power status, thereby generating control instructions for different power requirements and sending them to the PCS of the corresponding energy storage cabinet; wherein, the power before and after the AC measurement of multiple grid-connected points is calculated based on the electric energy information sent by the electric meter on the user load side and the energy storage electric meter of each energy storage cabinet.

[0009] As an improvement to the above solution, the communication interface is a serial port server, which includes a network interface and multiple serial ports. The network interface is used to connect to an interface of the switch, and the multiple serial ports are used to connect to the BMS, PCS and energy storage meter respectively.

[0010] As an improvement to the above solution, the AC combiner cabinet further includes a display screen connected to the iEMS; each of the energy storage sub-cabinets further includes a fire protection component connected to the communication interface, the fire protection component being configured to monitor the usage status of each energy storage sub-cabinet and generate a corresponding fire protection message to be sent to the iEMS; the iEMS performs the following operations based on the received fire protection message:

[0011] When the fire message is a level 1 fire warning, the iEMS generates a fault alarm, sends it to the terminal APP via the cloud server, and displays it on the display screen;

[0012] When the fire message is a second-level fire warning, the iEMS generates a fault alarm, sends it to the terminal APP through the cloud server, displays it on the display screen, and executes the power-off strategy.

[0013] As an improvement to the above solution, the power-off strategy includes:

[0014] Request the PCS to reduce power to 0. If other power devices exist, the power must also be limited to 0.

[0015] Request the PCS to shut down, the air conditioner to shut down, and if there are other peripherals that need to be controlled, send a shutdown command;

[0016] Control the BMS to power off. After the BMS determines that the loop current is less than 5A, it executes the power-off command.

[0017] As an improvement to the above solution, each energy storage cabinet also includes a humidity sensor and a dehumidifier connected to the communication interface. The humidity sensor is used to collect humidity data in the energy storage cabinet and send it to the iEMS through the communication interface. The iEMS controls the operation of the corresponding dehumidifier based on the received humidity data.

[0018] As an improvement to the above solution, each energy storage sub-cabinet also includes a water immersion sensor connected to the communication interface. The humidity sensor is used to collect water immersion data in the energy storage sub-cabinet and send it to the iEMS through the communication interface. When the iEMS determines that the energy storage sub-cabinet is flooded based on the received water immersion data, it issues a water immersion alarm and controls the power supply of the equipment in the corresponding energy storage sub-cabinet to be cut off.

[0019] As an improvement to the above solution, each of the energy storage cabinets further includes a liquid cooler connected to the BMS. The BMS is further configured to obtain temperature data of the energy storage battery. When the temperature data of the energy storage battery obtained by the BMS is greater than a first temperature threshold, the liquid cooler is controlled to operate to cool the energy storage cabinet and the energy storage battery.

[0020] As an improvement to the above solution, the BMS is further used to send the acquired temperature data of the energy storage battery to the iEMS through the communication interface. When the temperature data of the energy storage battery is greater than a second temperature threshold, the iEMS generates a control instruction for adjusting the power of the PCS to limit power output, thereby reducing temperature rise.

[0021] As an improvement to the above solution, the energy storage battery includes M battery modules connected in series, each battery module is connected to a corresponding BMU, and each BMU is responsible for collecting and managing the voltage, current, and temperature information of the single battery cell and uploading it to the BMS, and managing the single battery in the module to achieve single battery balancing function.

[0022] As an improvement to the above solution, the AC combiner cabinet is further connected to a UPS as an external device, and the UPS is used to supply power to the main equipment of the AC combiner cabinet and the energy storage cabinet in the event of a mains power outage.

[0023] Compared with the prior art, the embodiment of the present invention provides an integrated energy storage cabinet control system, which controls N energy storage cabinets through a total iEMS independently set in the AC junction cabinet, so that the iEMS communicates with the cloud server, and the iEMS communicates with each energy storage cabinet through a switch to collect status data of each energy storage cabinet and send corresponding control instructions. The iEMS has an energy management (EMU) function, collects AC power before and after multiple grid-connected points, and adjusts energy in real time according to demand plan, battery status, and real-time grid-connected power status, thereby realizing different functions, and can have the following technical effects: (1) reducing the cost of setting up an EMS separately for each energy storage cabinet; (2) the power information of each energy storage cabinet is directly sent to the iEMS for unified energy adjustment, instead of being calculated and processed by each EMS and then sent to the background monitoring for scheduling. In this way, the power information obtained is more direct and accurate, thereby improving the accuracy of energy scheduling. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a structural diagram of an energy storage integrated cabinet control system provided by an embodiment of the present invention.

[0026] Figure 2 It is a structural schematic diagram of an energy storage cabinet of an energy storage integrated cabinet control system provided by an embodiment of the present invention.

[0027] Figure 3 This is a working diagram of an energy storage integrated cabinet control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections, or communication; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The following explains some of the terms involved in the embodiments of the present invention:

[0033] BMS: A battery management system (BMS) is primarily used to monitor the operating status of each battery within a battery energy storage unit, ensuring its safe and reliable operation. The BMS monitors and collects battery status parameters (including but not limited to single-cell voltage, battery terminal temperature, battery circuit current, battery pack terminal voltage, and battery system insulation resistance) in real time. It then performs necessary analysis and calculations on these parameters to derive additional system status assessment parameters. Based on specific protection and control strategies, the BMS effectively manages the battery itself, ensuring the safe and reliable operation of the entire battery energy storage unit. Furthermore, the BMS can exchange information with external devices (such as the PCS, EMS, and fire protection systems) through its communication interfaces and analog / digital input / output interfaces, enabling coordinated control of all subsystems within the energy storage power station, ensuring safe, reliable, and efficient grid-connected operation. Furthermore, the BMS provides battery safety management, alarms for potential faults, and emergency protection measures. It also provides safe and optimized control of the operation of battery modules and battery clusters, ensuring safe, reliable, and stable battery operation.

[0034] BCU: Battery Cluster Management Unit (BCU), a device used to manage and control the battery cluster. It is primarily responsible for monitoring the status and performance of the battery cluster and controlling charging and discharging as needed to ensure safe and reliable operation. The BCU monitors parameters such as voltage, temperature, and current of each cell in the battery cluster to obtain real-time information on the battery status. Sensors are used to collect this data and transmit it to the control unit for processing and analysis. Based on this data, the BCU determines the battery's performance and status and takes appropriate measures for management and control. In addition to monitoring and control functions, the BCU also features other advanced features such as battery charge management, cell balancing, thermal management, and fault diagnosis. These features enhance the efficiency and lifespan of the battery cluster while ensuring its safe and reliable operation.

[0035] BMU: Battery Management Unit (BMU). It is a system used to manage battery modules. It can detect battery status (voltage, temperature, etc.) and provide a communication interface for the battery. The main functions of the BMU include: the BMU can monitor battery parameters such as voltage, current, and temperature in real time and send this data to other devices for data processing and analysis; the BMU can protect the battery from damage such as overcharging, over-discharging, and overcurrent, thereby extending the battery life; the BMU can provide an interface for communicating with other devices (such as charging stations and energy management systems), enabling data sharing and interaction; and the BMU can rationally control the battery's charge and discharge process based on the battery's state of charge and operating conditions, thereby improving energy utilization efficiency.

[0036] Among them, BMS is the management of the entire energy storage system, which covers the management of everything from battery cells, battery packs to battery clusters and the entire battery system. At the lowest level, BMS monitors and collects battery operating information in real time through the BMU, such as temperature, voltage, current, SOC (State of Charge Capacity) and SOH (State of Health). The BMU transmits the monitoring data to the BMS through the communication interface with the BMS. After the BMS processes and analyzes the data, it controls the battery charging and discharging process according to the set parameters to ensure operation within a safe range. At the same time, the BMS can also respond to and control various changes and abnormal conditions in the charging and discharging process in a timely manner through coordination between various units to achieve comprehensive management and protection of the battery pack.

[0037] The BCU, part of the BMS, manages the individual battery clusters within the battery pack. Composed of several interconnected battery modules and circuit equipment (monitoring and protection circuits, electrical and communication interfaces, and thermal management devices), the BCU controls the charging and discharging processes of multiple battery modules and monitors their status. The BCU communicates with the BMU via an interface, enabling real-time monitoring and adjustment of the battery cluster's status and performance. If any abnormalities are detected, the BCU directs the BMU to take appropriate action, achieving precise control.

[0038] In summary, in an energy storage system, the BMS is the highest-level management system, encompassing management from the battery cells to the entire battery system. The BCU, a component of the BMS, focuses on managing the battery cluster. The BMU, a lower-level device, is responsible for real-time monitoring and collecting battery operating information, transmitting this data to upper-level management systems for processing and analysis. These three components work together to ensure the safe, efficient, and reliable operation of the energy storage system.

[0039] PCS: Energy storage converter, also known as a bidirectional energy storage inverter. It is the core component that enables bidirectional energy flow between the energy storage system and the grid. It controls the battery charging and discharging process and performs AC / DC conversion. The PCS's main functions include: constant power or constant current control based on microgrid monitoring instructions, charging or discharging the battery, and smoothing the highly volatile output of wind and photovoltaic power generation.

[0040] EMS: Energy Management System, which enables real-time monitoring and intelligent management of all system devices. EMS can collect, store, process, upload data, control operations, formulate operational strategies, and conduct overall information-based monitoring and management.

[0041] refer to Figure 1An embodiment of the present invention provides an integrated energy storage cabinet control system, comprising an AC combiner cabinet 10, N energy storage sub-cabinets 20, a cloud server 30, and a terminal APP 40. Each energy storage sub-cabinet 20 is connected to the power grid and the power load via the AC combiner cabinet 10. The AC combiner cabinet 10 is wirelessly connected to the cloud server 30, and the terminal APP 40 is wirelessly connected to the cloud server 30.

[0042] Specifically, the AC junction box 10 includes an iEMS, as well as a switch, an energy meter, a main circuit breaker, and N sub-circuit breakers, each connected to the iEMS. One end of each of the N sub-circuit breakers is connected to one end of the main circuit breaker (via an AC line). One end of the main circuit breaker is used to connect the grid and the load, and the other ends of the N sub-circuit breakers are each connected to a corresponding energy storage sub-cabinet 20. The energy meter's input is placed between the main circuit breaker and the N sub-circuit breakers and is used to collect total energy information from the energy storage sub-cabinets when discharging to or charging from the grid in grid-connected mode, and discharging to the load in off-grid mode.

[0043] refer to Figure 2 Each energy storage cabinet 20 includes an energy storage battery, a BMS, a PCS, an energy storage meter, and a communication interface. The BMS, PCS, and energy storage meter are all connected to the communication interface. The communication interface is a serial port server, which includes a network interface and multiple serial ports. The network interface is used to connect to one port of the switch, and the multiple serial ports are used to connect to the BMS, PCS, and energy storage meter, respectively. The network interface uses an RJ45 interface, and the serial port uses RS485.

[0044] The PCS is used to achieve AC / DC conversion. The AC end of the PCS is connected to the other end of a circuit breaker of the AC junction box 10, and the DC end of the PCS is connected to the energy storage battery. The PCS receives control instructions from the iEMS through the communication interface and charges or discharges the energy storage battery according to the control instructions. The BMS connects to the energy storage battery to obtain status information of the energy storage battery and sends the acquired status information of the energy storage battery to the iEMS through the communication interface. The energy storage meter is used to collect electric energy information of the corresponding energy storage cabinet discharging to the grid or charging from the grid in grid-connected mode, and discharging to the load in off-grid mode, and sends it to the iEMS through the communication interface.

[0045] It can be understood that the energy storage battery includes M battery modules connected in series, each battery module is connected to a corresponding BMU, and each BMU is responsible for collecting and managing the voltage, current, and temperature information of the single battery cell and uploading it to the BMS, and managing the single battery in the module to realize the single battery balancing function.

[0046] In this embodiment of the present invention, N is less than or equal to 5, and M is greater than or equal to 2.

[0047] Specifically, refer to Figure 3 In this embodiment, the iEMS has an energy management function and can collect the power before and after the AC measurement of multiple grid-connected points. It can adjust the energy in real time according to the demand plan set by the user through the terminal APP and sent to the iEMS through the cloud server, the battery status of the corresponding energy storage battery sent by the BMS of each energy storage cabinet, and the real-time grid-connected power status, thereby generating control instructions for different power requirements and sending them to the PCS of the corresponding energy storage cabinet; wherein, the power before and after the AC measurement of multiple grid-connected points is calculated based on the electric energy information sent by the electric meter on the user load side and the energy storage electric meter of each energy storage cabinet.

[0048] As will be appreciated, each energy storage cabinet 20 includes a battery map that updates battery status information in real time. During the charge and discharge process of each energy storage cabinet 20, the BMS obtains the corresponding battery status information from the map and transmits the obtained battery status information to the iEMS via the communication interface. The battery status information also includes data such as temperature.

[0049] Further, return to reference Figure 1 and Figure 2 The AC combiner cabinet 10 also includes a display screen connected to the iEMS. Each energy storage cabinet 20 also includes a fire protection component connected to the communication interface. The fire protection component is used to monitor the usage status of each energy storage cabinet and generate corresponding fire protection messages to send to the iEMS. The iEMS performs the following operations based on the received fire protection messages:

[0050] When the fire message is a level 1 fire warning, the iEMS generates a fault alarm, sends it to the terminal APP via the cloud server, and displays it on the display screen;

[0051] When the fire message is a second-level fire warning, the iEMS generates a fault alarm, sends it to the terminal APP through the cloud server, displays it on the display screen, and executes the power-off strategy.

[0052] The power-off strategy includes:

[0053] Request the PCS to reduce power to 0. If other power devices exist, the power must also be limited to 0.

[0054] Request the PCS to shut down, the air conditioner to shut down, and if there are other peripherals that need to be controlled, send a shutdown command;

[0055] Control the BMS to power off. After the BMS determines that the loop current is less than 5A, it executes the power-off command.

[0056] Furthermore, each of the energy storage cabinets 20 also includes a humidity sensor and a dehumidifier connected to the communication interface. The humidity sensor is used to collect humidity data in the energy storage cabinet and send it to the iEMS through the communication interface. The iEMS controls the operation of the corresponding dehumidifier based on the received humidity data.

[0057] Furthermore, each of the energy storage sub-cabinets 20 also includes a water immersion sensor connected to the communication interface. The humidity sensor is used to collect water immersion data in the energy storage sub-cabinet and send it to the iEMS through the communication interface. When the iEMS determines that the energy storage sub-cabinet is flooded based on the received water immersion data, it issues a water immersion alarm and controls the power supply of the equipment in the corresponding energy storage sub-cabinet to be cut off.

[0058] Furthermore, each of the energy storage cabinets 20 also includes a liquid cooler connected to the BMS. The BMS is also used to obtain temperature data of the energy storage battery. When the temperature data of the energy storage battery obtained by the BMS is greater than a first temperature threshold, the liquid cooler is controlled to operate to cool the energy storage cabinet and the energy storage battery.

[0059] Furthermore, the BMS is also used to send the acquired temperature data of the energy storage battery to the iEMS through the communication interface. When the temperature data of the energy storage battery is greater than a second temperature threshold, the iEMS generates a control instruction for adjusting the power of the PCS to limit power output, thereby reducing temperature rise.

[0060] Understandably, Figure 1 As shown, the AC combiner cabinet 10 is further connected to a UPS as an external device. The UPS is used to supply power to the main devices of the AC combiner cabinet 10 and the energy storage cabinet 20 when the mains power is cut off.

[0061] In summary, an embodiment of the present invention provides an integrated energy storage cabinet control system, which controls N energy storage cabinets through a total iEMS independently set in the AC junction cabinet, so that the iEMS communicates with the cloud server, and the iEMS communicates with each energy storage cabinet through a switch to collect status data of each energy storage cabinet and send corresponding control instructions. The iEMS has an energy management (EMU) function, collects AC power before and after multiple grid-connected points, and adjusts energy in real time according to demand plan, battery status, and real-time grid-connected power status, thereby realizing different functions, and can have the following technical effects: (1) reducing the cost of setting up an EMS separately for each energy storage cabinet; (2) the power information of each energy storage cabinet is directly sent to the iEMS for unified energy adjustment, instead of being calculated and processed by each EMS and then sent to the background monitoring for scheduling. In this way, the power information obtained is more direct and accurate, thereby improving the accuracy of energy scheduling.

[0062] The above disclosures are merely some preferred embodiments of the present invention, and certainly cannot be used to limit the scope of the present invention. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. An energy storage integrated cabinet control system, characterized in that: It includes an AC combiner cabinet, N energy storage cabinets, a cloud server, and a terminal APP; each energy storage cabinet is connected to the power grid and the power load through the AC combiner cabinet, the AC combiner cabinet is wirelessly connected to the cloud server, and the terminal APP is wirelessly connected to the cloud server; The AC combiner cabinet includes an iEMS and a switch, an energy meter, a main circuit breaker, and N sub-circuit breakers, each of which is connected to the iEMS. One end of each of the N sub-circuit breakers is connected to one end of the main circuit breaker. One end of the main circuit breaker is used to connect the power grid and the load, and the other ends of the N sub-circuit breakers are respectively connected to a corresponding energy storage cabinet. The input end of the energy meter is placed between the main circuit breaker and the N sub-circuit breakers and is used to collect total energy information discharged by the energy storage cabinet to the grid or charged from the grid in grid-connected mode, and discharged to the load in off-grid mode. Each of the energy storage sub-cabinets includes an energy storage battery, a BMS, a PCS, an energy storage meter and a communication interface; the BMS, PCS and energy storage meter are all connected to the communication interface, and the communication interface is also connected to the switch; the PCS is used to realize AC / DC conversion, the AC end of the PCS is connected to the other end of a circuit breaker of the AC combiner cabinet, and the DC end of the PCS is connected to the energy storage battery. The PCS receives control instructions from the iEMS through the communication interface and charges or discharges the energy storage battery according to the control instructions; the BMS is connected to the energy storage battery to obtain status information of the energy storage battery, and sends the acquired status information of the energy storage battery to the iEMS through the communication interface; the energy storage meter is used to collect electric energy information of the corresponding energy storage sub-cabinet discharging to the grid or charging from the grid in grid-connected mode and discharging to the load in off-grid mode, and sends it to the iEMS through the communication interface for unified energy regulation; The iEMS has an energy management function and can collect the power before and after the AC measurement of multiple grid-connected points, and adjust the energy in real time according to the demand plan set by the user through the terminal APP and sent to the iEMS through the cloud server, the battery status of the corresponding energy storage battery sent by the BMS of each energy storage cabinet, and the real-time grid-connected power status, thereby generating control instructions for different power requirements and sending them to the PCS of the corresponding energy storage cabinet; wherein, the power before and after the AC measurement of multiple grid-connected points is calculated based on the electric energy information sent by the electric meter on the user load side and the energy storage electric meter of each energy storage cabinet.

2. The energy storage integrated cabinet control system according to claim 1, characterized in that: The communication interface is a serial port server, which includes a network interface and multiple serial ports. The network interface is used to connect to an interface of the switch, and the multiple serial ports are used to connect to the BMS, PCS and energy storage meter respectively.

3. The energy storage integrated cabinet control system according to claim 1, characterized in that: The AC combiner cabinet further includes a display screen connected to the iEMS; each energy storage cabinet further includes a fire protection component connected to the communication interface, the fire protection component being configured to monitor the usage status of each energy storage cabinet and generate a corresponding fire protection message to be sent to the iEMS; the iEMS performs the following operations based on the received fire protection message: When the fire message is a level 1 fire warning, the iEMS generates a fault alarm, sends it to the terminal APP via the cloud server, and displays it on the display screen; When the fire message is a second-level fire warning, the iEMS generates a fault alarm, sends it to the terminal APP through the cloud server, displays it on the display screen, and executes the power-off strategy.

4. The energy storage integrated cabinet control system according to claim 3, characterized in that: The power-off strategy includes: Request the PCS to reduce power to 0. If other power devices exist, the power must also be limited to 0. Request the PCS to shut down, the air conditioner to shut down, and if there are other peripherals that need to be controlled, send a shutdown command; Control the BMS to power off. After the BMS determines that the loop current is less than 5A, it executes the power-off command.

5. The energy storage integrated cabinet control system according to claim 1, characterized in that: Each of the energy storage cabinets also includes a humidity sensor and a dehumidifier connected to the communication interface. The humidity sensor is used to collect humidity data in the energy storage cabinet and send it to the iEMS through the communication interface. The iEMS controls the operation of the corresponding dehumidifier based on the received humidity data.

6. The energy storage integrated cabinet control system according to claim 1, characterized in that: Each of the energy storage sub-cabinets also includes a water immersion sensor connected to the communication interface. The water immersion sensor is used to collect water immersion data in the energy storage sub-cabinet and send it to the iEMS through the communication interface. When the iEMS determines that the energy storage sub-cabinet is flooded based on the received water immersion data, it issues a water immersion alarm and controls the power supply of the equipment in the corresponding energy storage sub-cabinet to be cut off.

7. The energy storage integrated cabinet control system according to claim 1, characterized in that: Each of the energy storage sub-cabinets also includes a liquid cooler connected to the BMS. The BMS is also used to obtain temperature data of the energy storage battery. When the temperature data of the energy storage battery obtained by the BMS is greater than a first temperature threshold, the liquid cooler is controlled to operate to cool the energy storage sub-cabinet and the energy storage battery.

8. The energy storage integrated cabinet control system according to claim 7, characterized in that: The BMS is further configured to send the acquired temperature data of the energy storage battery to the iEMS via the communication interface. When the temperature data of the energy storage battery is greater than a second temperature threshold, the iEMS generates a control instruction for adjusting the power of the PCS to limit power output, thereby reducing temperature rise.

9. The energy storage integrated cabinet control system according to claim 1, characterized in that: The energy storage battery includes M battery modules connected in series, each battery module is connected to a corresponding BMU, and each BMU is responsible for collecting and managing the voltage, current, and temperature information of the single battery cell and uploading it to the BMS, and managing the single battery in the module to achieve the single battery balancing function.

10. The energy storage integrated cabinet control system according to claim 1, characterized in that: The AC combiner cabinet is also connected to a UPS as an external device, and the UPS is used to supply power to the main equipment of the AC combiner cabinet and the energy storage cabinet in the event of a mains power outage.

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