Control cabinet for energy storage system and energy storage system

Abstract

The utility model discloses a control cabinet for an energy storage system and the energy storage system, and belongs to the technical field of energy storage. The control cabinet for the energy storage system comprises a general control unit, a power taking module and a power supply module. And the master control unit is in communication connection with the battery cabinet at the tail end in the battery cabinet array, and is used for carrying out information acquisition and control on each battery cabinet in the battery cabinet array. The power taking module is used for taking power from a transformer of the PCS all-in-one machine. The power supply module is used for obtaining input power from the power taking module and supplying power to the master control unit. And the power supply module is connected with a preset number of battery cabinets in the battery cabinet array through a preset number of miniature circuit breakers, and is used for supplying power to the preset number of battery cabinet control power supplies and the battery cabinet liquid cooling unit. The control cabinet for the energy storage system can solve the problems that in the prior art, a control system is installed in a distributed mode, the cable cost is too high, and interference is likely to happen when control signals are transmitted.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to a control cabinet for an energy storage system and an energy storage system. Background Art

[0002] In energy storage systems, energy management is usually carried out by connecting multiple channel battery systems in parallel. The energy management system needs to independently control the batteries of each channel according to the actual load conditions and the fault status of the battery systems of each channel, so as to ensure the uninterrupted operation of the energy storage battery system at the optimal utilization rate.

[0003] At present, in the design of mobile energy storage or large energy storage power stations, most of them adopt the way of integrating each channel battery with the channel control system, which leads to the decentralized installation of each control system, which is too costly and inconvenient for debugging and maintenance. Or, the centralized control of multi-channel batteries is achieved by setting up a confluence part, a control part and a power distribution part in a single control cabinet. However, this type of control cabinet has high-voltage and low-voltage parts, as well as control signals, which are easily interfered during signal transmission. In addition, multiple battery cabinets are connected in parallel to the main controller through switches, which has high cable costs. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a control cabinet for an energy storage system and an energy storage system in view of the above-mentioned deficiencies in the prior art. The control system in the cabinet is highly integrated, and the communication of the control cabinet is only connected to the last battery cabinet in the battery cabinet array, which is convenient for debugging and maintenance. In addition, there is no high-voltage part design in the control cabinet, which avoids signal interference.

[0005] In a first aspect, the utility model provides a control cabinet for an energy storage system, comprising a master control unit, a power extraction module and a power supply module.

[0006] The main control unit is communicatively connected to the battery cabinet at the end of the battery cabinet array, and is used to collect information and control each battery cabinet in the battery cabinet array, wherein the battery cabinet array is formed by at least two battery cabinets connected in series. The power supply module is connected to the PCS integrated energy storage inverter, and is used to draw power from the small dry transformer of the PCS integrated machine. The power supply module is connected to the power supply module and the main control unit, and is used to obtain input power from the power supply module and supply power to the main control unit. The power supply module includes a miniature circuit breaker, and the power supply module is connected to a preset number of battery cabinets in the battery cabinet array through a preset number of miniature circuit breakers, and is used to supply power to a preset number of battery cabinet control power supplies and battery cabinet liquid cooling units.

[0007] Preferably, the control cabinet for the energy storage system also includes a fire display and control host and an optoelectronic switch.

[0008] The power supply module also includes an uninterruptible power supply UPS and a switching power supply.

[0009] UPS is used to provide stable power to the preset number of battery cabinet control power supplies. UPS is also connected to the switching power supply to provide stable power to the switching power supply. The switching power supply provides stable power to the main control unit, the fire display and control host, and the photoelectric switch.

[0010] The fire display and control host is used to display, summarize and alarm the fire information of the battery cabinet array.

[0011] Preferably, the master control unit includes a battery management system BMS master control.

[0012] The BMS master control is connected to the PCS integrated machine and the energy management system EMS, and is used for linkage control with the PCS integrated machine and EMS. The linkage control refers to optimizing the load control strategy according to the output power requirements and the charge state of each battery cluster.

[0013] Preferably, the BMS master control also communicates with the fire display and control host via the controller area network CAN and dry node mode to collect and upload fire information.

[0014] The BMS master control also communicates with the battery cabinet at the end through CAN to collect information and control each battery cabinet in the battery cabinet array.

[0015] The BMS master control also communicates with the photoelectric switch via Ethernet, which is used to convert electrical information into optical information through the photoelectric switch and transmit the optical information to the EMS.

[0016] Preferably, the control cabinet for the energy storage system also includes a three-phase electric meter, a surge protector, and a fuse.

[0017] The three-phase electricity meter is connected in parallel with the power taking module to measure the auxiliary power consumption of the energy storage DC side.

[0018] The surge protector is connected in series with the fuse and then connected to the power supply module to prevent instantaneous overcurrent from entering and damaging the control cabinet.

[0019] Preferably, the control cabinet for the energy storage system further includes a sensor wire and an aerosol.

[0020] The sensing line is wound around the inner wall of the control cabinet from top to bottom, and is used to drive the aerosol spraying when the temperature inside the control cabinet is greater than a preset threshold.

[0021] Preferably, the fire display and control host is also used to synchronize alarm information to station-level fire equipment.

[0022] The input power voltage is 400 volts AC.

[0023] In a second aspect, the utility model further provides an energy storage system, comprising a battery cabinet array, a PCS integrated machine and a control cabinet for the energy storage system described in the first aspect.

[0024] The battery cabinet array is formed by at least two battery cabinets connected in series.

[0025] The control cabinet for the energy storage system communicates with the battery cabinet at the end of the battery cabinet array and is used to collect information and control each battery cabinet in the battery cabinet array.

[0026] The PCS integrated machine is connected to the control cabinet for the energy storage system and each battery cabinet in the battery cabinet array to realize the conversion, regulation and control of electric energy, and the transformer based on the PCS integrated machine provides input power to the control cabinet for the energy storage system.

[0027] The energy storage system control cabinet and energy storage system of the utility model have a highly integrated control system in the cabinet. The master control unit in the cabinet is connected to the battery cabinet at the end of the battery cabinet array through communication, so as to realize the information collection and control of all battery cabinets in the battery cabinet array formed in series. Compared with connecting multiple battery cabinets in parallel to the main controller through a switch, it saves cable costs and is also convenient for debugging and maintenance. There is no confluence in the control cabinet, so there is no high-voltage part, which avoids signal interference. In addition, one control cabinet can support the auxiliary power supply of a preset number of battery cabinets, with strong flexibility and further cost savings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a control cabinet for an energy storage system according to Embodiment 1 of the utility model;

[0029] Figure 2 This is an electrical structure diagram of a control cabinet for an energy storage system according to Example 1 of the utility model. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] Embodiment 1:

[0032] like Figure 1 As shown, this embodiment provides a control cabinet for an energy storage system, including a master control unit 11 , a power taking module 12 and a power supply module 13 .

[0033] The main control unit 11 is communicatively connected to the last battery cabinet in the battery cabinet array, and is used to collect information and control each battery cabinet in the battery cabinet array, wherein the battery cabinet array is formed by at least two battery cabinets connected in series.

[0034] The power taking module 12 is connected to the energy storage converter PCS integrated machine and is used to take power from the transformer of the PCS integrated machine.

[0035] The power supply module 13 is connected to the power taking module 12 and the main control unit 11 , and is used to obtain input power from the power taking module 12 and supply power to the main control unit 11 .

[0036] The power supply module 13 includes a miniature circuit breaker.

[0037] The power supply module 13 is connected to a preset number of battery cabinets in the battery cabinet array through a preset number of miniature circuit breakers, and is used to supply power to a preset number of battery cabinet control power supplies and battery cabinet liquid cooling units.

[0038] In this embodiment, after the battery cabinets are connected in series, the battery cabinet at the end of the battery cabinet array communicates with the master control unit, so that the energy storage system control cabinet can collect and control the battery cabinet array, which can save cable costs. Furthermore, the power supply module of the energy storage system control cabinet is connected to the PCS integrated machine, and power is taken from the transformer of the PCS integrated machine, such as Figure 2 The input voltage of 400 volts (+10%, -15%) from the low-voltage side of the box transformer is shown to provide auxiliary power supply to each battery cabinet, and there is no convergence part in the control cabinet for the energy storage system, so as to avoid interference of the high-voltage part in the control cabinet with the control signal. The control cabinet for the energy storage system displays, summarizes and uploads the information of the entire battery cabinet array to the system, and displays, summarizes, alarms and uploads the fire information of the entire battery cabinet array to the system, and supplies power to the auxiliary system of the entire battery cabinet array. The auxiliary power supply of each battery cabinet is independent, which can be achieved by configuring a preset number of miniature circuit breakers in the control cabinet. The power supply module controls the power supply to a preset number of battery cabinets (such as the preset number is 18) (such as Figure 2 QF25-QF42 connection shown) and liquid cooling unit (such as with Figure 2 For example, one energy storage system control cabinet can support the auxiliary power supply of 1 to 18 battery cabinets, with high integration and flexibility (flexible configuration of the corresponding number of miniature circuit breakers can match the corresponding number of battery cabinets), which can further save costs.

[0039] Optionally, the control cabinet for the energy storage system also includes a fire display and control host and a photoelectric switch.

[0040] The power supply module also includes an uninterruptible power supply UPS and a switching power supply.

[0041] UPS is used to provide stable power to a preset number of battery cabinet control power supplies.

[0042] UPS is also connected to the switching power supply to provide stable power to the switching power supply, so that the switching power supply can provide stable power to the main control unit, the fire display and control host, and the photoelectric switch. The fire display and control host is used to display, summarize, and alarm the fire information of the battery cabinet array.

[0043] In this embodiment, Figure 2 As shown, UPS is used to provide stable power supply. UPS power supply is output to the battery cabinet control power supply and the switch power supply P1 in the control cabinet. The switch power supply P1 in the control cabinet supplies power to the fire display and control host, the main control unit, and the photoelectric switch, and provides 2 hours of backup power UPS battery. It should be noted that the backup power supply capacity can support the operation of important equipment for 2 hours, so that the BMS main control, main circuit breaker, main relay, pre-charge relay, spoiler fan, indicator light, IO expansion board, fire suppression host, fire detector, explosion-proof fan of the battery cabinet, the main control unit of the energy storage system control cabinet, the fire display and control host, the photoelectric switch, the indicator light, and the intermediate relay can continue to work in the case of a city power outage. The fire display and control host of the distributed energy storage fire suppression system in the energy storage system control cabinet is used to collect, display, and start control of the information of the monitoring module and the suppression host. At the same time, it is used to output linkage signals to the main control unit, and is also used to synchronously upload alarm information to the station-level fire protection. An audible and visual alarm is equipped on the top of the energy storage system control cabinet, which is linked with the fire protection.

[0044] Optionally, the master control unit includes a battery management system BMS master control. The BMS master control is connected to the PCS integrated machine and the energy management system EMS, and is used for linkage control with the PCS integrated machine and the EMS, wherein the linkage control refers to optimizing the load control strategy according to the output power requirement and the charge state of each battery cluster.

[0045] In this embodiment, the BMS master control is used to perform numerical calculations, performance analysis, alarm processing, and record storage of the real-time battery information uploaded by the BMS master control and BMS slave control of each battery cabinet. The real-time information includes but is not limited to the voltage, temperature, and temperature difference of a single battery cell, and the voltage and current of the battery cabinet. The BMS master control is also used to perform linkage control with the PCS integrated machine, energy storage energy management system (EMS), etc., and optimize the load control strategy according to the output power requirements and the SOC (State of Charge) of each battery cluster to ensure the safe, stable, and efficient operation of the battery system.

[0046] Optionally, the BMS master control also communicates with the fire display and control host through the controller area network CAN and dry node mode to collect and upload fire information. The BMS master control also communicates with the battery cabinet at the end through CAN to collect and control information of each battery cabinet in the battery cabinet array. The BMS master control also communicates with the photoelectric switch through Ethernet to convert electrical information into optical information through the photoelectric switch and transmit the optical information to the EMS.

[0047] In this embodiment, the BMS master control communicates with the fire display and control host through CAN and dry contact to upload fire information. The BMS master control communicates with the battery cabinets in the battery cabinet array through CAN communication. The BMS master control communicates with the air conditioner and the electric meter through RS485 to upload information. The BMS master control communicates with the photoelectric switch through Ethernet, and converts the electrical information into optical information through the photoelectric switch, and sends the optical information to the EMS system. The signals transmitted to the BMS master control through dry contact are: UPS fault feedback, UPS low power feedback, travel switch status feedback, remote / local control feedback, aerosol feedback, emergency stop feedback, surge feedback, and water immersion sensor feedback. By integrating all external information of the battery cabinet into the control cabinet for the energy storage system, and then branching it to each system from the control cabinet for the energy storage system, a high degree of integration is achieved and cost savings are saved. Integrated control specifically includes optical communication between BMS master control and EMS, communication between BMS master control and BMS master control of each battery cabinet, RS485 communication between fire display and control host and station-level fire host, CAN communication between fire display and control host and battery cabinet suppression host, CAN communication between battery cabinet and PCS, and dry contact communication between battery cabinet and PCS. All important equipment and equipment that needs to be observed are integrated in one control cabinet for easy equipment maintenance.

[0048] Optionally, the control cabinet for the energy storage system also includes a three-phase electric meter, a surge protector, and a fuse.

[0049] The three-phase electric meter is connected in parallel with the power module to measure the auxiliary power consumption of the energy storage DC side. The surge protector is connected in series with the fuse and then connected to the power module to prevent instantaneous overcurrent from damaging the control cabinet.

[0050] In this embodiment, the cabinet is equipped with a three-phase electric meter (such as Figure 2 The meter shown in the figure is used to measure the auxiliary power consumption of the energy storage DC side. The meter can be used to measure voltage, current, power, etc. The voltage can be directly collected and the current can be collected through three current transformers. The cabinet is equipped with a surge protector (such as Figure 2 As shown), to prevent large currents such as lightning from entering and damaging the cabinet. At the same time, the surge protector is equipped with fuse protection. When the current is too large, the surge will not cause damage. If necessary, you only need to replace the fuse, which is easy to maintain.

[0051] Optionally, the control cabinet for the energy storage system further includes a sensor line and an aerosol.

[0052] The sensing line is wound around the inner wall of the control cabinet from top to bottom, and is used to drive the aerosol spraying when the temperature inside the control cabinet is greater than a preset threshold.

[0053] In this embodiment, aerosol is installed in the cabinet, and the sensor line wraps around the inner wall of the control cabinet from top to bottom. When a fire occurs at a certain location due to a short circuit or other factors, the sensor line drives the aerosol to spray when the temperature reaches a preset threshold (such as 170°C), and at the same time uploads the action signal to the BMS to improve the safety of the control cabinet.

[0054] The energy storage system control cabinet of this embodiment has a highly integrated control system in the cabinet. The main control unit in the cabinet communicates with the battery cabinet at the end of the battery cabinet array to realize information collection and control of all battery cabinets in the battery cabinet array formed in series. Compared with connecting multiple battery cabinets in parallel to the control cabinet through a switch, it saves cable costs and is also convenient for debugging and maintenance. In addition, the control cabinet has no confluence part and draws power from the transformer of the PCS all-in-one machine, so that there is no high-voltage part design in the cabinet, avoiding signal interference. Furthermore, the energy storage system control cabinet can support auxiliary power supply for any number of battery cabinets in the range of 1 to 18, with high integration and further cost savings. The UPS in the energy storage system control cabinet can enable important equipment of the energy storage system to continue to work when the city power is interrupted. By integrating all external information of all battery cabinets into the energy storage system control cabinet, and then branching it to various systems by the energy storage system control cabinet, a high degree of integration is further achieved, saving costs. The surge protector in the control cabinet is equipped with a fuse, which can cause no damage to the surge when the current is too large. If necessary, only the fuse needs to be replaced, which is easy to maintain. The cabinet is equipped with aerosol, and the sensor line can drive the aerosol spraying when short-circuited, which improves the safety of the control cabinet.

[0055] Embodiment 2:

[0056] This embodiment provides an energy storage system, including a battery cabinet array, a PCS integrated machine and a control cabinet for the energy storage system described in Embodiment 1.

[0057] The battery cabinet array is formed by at least two battery cabinets connected in series.

[0058] The control cabinet for the energy storage system communicates with the battery cabinet at the end of the battery cabinet array and is used to collect information and control each battery cabinet in the battery cabinet array.

[0059] The PCS integrated machine is connected to the control cabinet for the energy storage system and each battery cabinet in the battery cabinet array to realize the conversion, regulation and control of electric energy, and the transformer based on the PCS integrated machine provides input power to the control cabinet for the energy storage system.

[0060] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A control cabinet for an energy storage system, characterized in that: Including the main control unit, power supply module and power supply module, The main control unit is connected to the battery cabinet at the end of the battery cabinet array for collecting information and controlling each battery cabinet in the battery cabinet array, wherein the battery cabinet array is formed by at least two battery cabinets connected in series. The power supply module is connected to the energy storage converter PCS integrated machine and is used to obtain power from the transformer of the PCS integrated machine. The power supply module is connected to the power supply module and the main control unit, and is used to obtain input power from the power supply module and supply power to the main control unit. The power supply module includes a miniature circuit breaker, The power supply module is connected to a preset number of battery cabinets in the battery cabinet array through a preset number of miniature circuit breakers, and is used to supply power to a preset number of battery cabinet control power supplies and battery cabinet liquid cooling units.

2. The control cabinet for the energy storage system according to claim 1, characterized in that: It also includes fire display and control host, photoelectric switch, The power supply module also includes an uninterruptible power supply UPS, a switching power supply, UPS, used to provide stable power to a preset number of battery cabinet control power supplies, UPS is also connected to the switching power supply to provide stable power to the switching power supply, so that the switching power supply can provide stable power to the main control unit, the fire display and control host, and the photoelectric switch. The fire display and control host is used to display, summarize and alarm the fire information of the battery cabinet array.

3. The control cabinet for the energy storage system according to claim 2, characterized in that: The master control unit includes the battery management system BMS master control, The BMS master control is connected to the PCS integrated machine and the energy management system EMS, and is used for linkage control with the PCS integrated machine and EMS. The linkage control refers to optimizing the load control strategy according to the output power requirements and the charge state of each battery cluster.

4. The control cabinet for the energy storage system according to claim 3, characterized in that: The BMS master control also communicates with the fire display and control host through the controller area network CAN and dry node mode to collect and upload fire information. The BMS master control also communicates with the battery cabinet at the end through CAN to collect information and control each battery cabinet in the battery cabinet array. The BMS master control also communicates with the photoelectric switch via Ethernet, which is used to convert electrical information into optical information through the photoelectric switch and transmit the optical information to the EMS.

5. The control cabinet for the energy storage system according to any one of claims 1 to 4, characterized in that: Also includes three-phase electricity meter, surge protector, fuse, The three-phase electric meter is connected in parallel with the power taking module to measure the auxiliary power consumption of the DC side of the energy storage. The surge protector is connected in series with the fuse and then connected to the power supply module to prevent instantaneous overcurrent from entering and damaging the control cabinet.

6. The control cabinet for the energy storage system according to claim 5, characterized in that: Also includes sensing wires and aerosols, The sensing line is wound around the inner wall of the control cabinet from top to bottom, and is used to drive the aerosol spraying when the temperature inside the control cabinet is greater than a preset threshold.

7. The control cabinet for the energy storage system according to claim 6, characterized in that: The fire display and control host is also used to synchronize alarm information to station-level fire equipment. The input power voltage is 400 volts AC.

8. An energy storage system, characterized in that: It comprises a battery cabinet array, a PCS integrated machine and a control cabinet for an energy storage system according to any one of claims 1 to 7, A battery cabinet array is formed by connecting at least two battery cabinets in series. The control cabinet for the energy storage system communicates with the battery cabinet at the end of the battery cabinet array to collect information and control each battery cabinet in the battery cabinet array. The PCS integrated machine is connected to the control cabinet for the energy storage system and each battery cabinet in the battery cabinet array to realize the conversion, regulation and control of electric energy, and the transformer based on the PCS integrated machine provides input power to the control cabinet for the energy storage system.

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