A control cabinet of an energy storage device and an energy storage system

Abstract

The application relates to the technical field of energy storage control, and discloses a control cabinet of an energy storage device and an energy storage system. The control cabinet comprises control area equipment and power area equipment, the control area equipment is electrically connected with the energy storage device and the power area equipment respectively, the power area equipment comprises a direct-current circuit breaker, a direct-current fuse, an inverter, a reactor and an alternating-current fuse, one end of the direct-current circuit breaker is electrically connected with a power grid, the other end of the direct-current circuit breaker is electrically connected with the direct-current fuse, the direct-current fuse is electrically connected with an input end of the inverter, an output end of the inverter is electrically connected with the reactor, the reactor is electrically connected with the alternating-current fuse, and the alternating-current fuse is electrically connected with the energy storage device. The control area equipment and the power area equipment of the energy storage device are integrated through the control cabinet, the control of the energy storage system is more simple and efficient, and the energy storage system can be quickly maintained when a fault occurs.

Description

Technical Field

[0001] This application relates to the field of energy storage control technology, and in particular to a control cabinet and energy storage system for an energy storage device. Background Technology

[0002] The electrical control cabinets of existing flywheel energy storage devices typically adopt a distributed layout, mainly including basic components such as circuit breakers, relays, and control boards. The layout of each component is scattered and chaotic. Once a fault occurs, all components need to be inspected before maintenance can be carried out, which affects the continuous operation of the energy storage device. Utility Model Content

[0003] To address the problem of maintenance difficulties caused by the dispersed layout of existing energy storage device control components, this application provides a control cabinet and energy storage system for an energy storage device.

[0004] In a first aspect, this application provides a control cabinet for an energy storage device, comprising:

[0005] The system includes control area equipment and power area equipment. The control area equipment is electrically connected to both the energy storage equipment and the power area equipment. The power area equipment includes a DC circuit breaker, a first DC fuse, an inverter, a reactor, and an AC fuse. One end of the DC circuit breaker is electrically connected to the power grid, and the other end is electrically connected to the first DC fuse. The first DC fuse is electrically connected to the input terminal of the inverter, and the output terminal of the inverter is electrically connected to the reactor. The reactor is electrically connected to the AC fuse, and the AC fuse is electrically connected to the energy storage equipment.

[0006] In an optional embodiment, the energy storage device includes a flywheel energy storage device, which is connected to an external braking resistor via a parallel cable.

[0007] In an optional implementation, the control area equipment includes a surge protector and a second DC fuse, the surge protector being electrically connected to the DC circuit breaker via the second DC fuse.

[0008] In an optional implementation, the control area device includes an uninterruptible power supply, a 24V switching power supply, and a control board. The uninterruptible power supply is electrically connected to the 24V switching power supply, and the 24V switching power supply is electrically connected to the control board.

[0009] In an optional implementation, the control area device includes a DC meter that is electrically connected to the incoming side of the power grid and performs data sampling.

[0010] In an optional implementation, the control area device includes an insulation detector, one end of which is electrically connected to the positive terminal of the DC output line of the power grid, and the other end of which is electrically connected to the negative terminal of the DC output line of the power grid.

[0011] In an optional implementation, the control cabinet further includes an industrial control panel, which is communicatively connected to the control board, the DC meter, and the insulation detector.

[0012] In an optional embodiment, the control cabinet further includes a temperature and humidity controller, which is located inside the control cabinet and is communicatively connected to the industrial control panel.

[0013] Secondly, this application provides an energy storage system, including an energy storage device and a control cabinet as described in the first aspect.

[0014] The embodiments of this application have the following beneficial effects:

[0015] The control cabinet for the energy storage device provided in this application integrates multiple components such as circuit breakers, relays, and control boards into one cabinet, making the control of the energy storage device more efficient. Moreover, when any component fails, the faulty component can be quickly located through the control cabinet, improving maintenance efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation on the scope of protection of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the frame structure of a control cabinet for an energy storage device according to an embodiment of this application is shown;

[0018] Figure 2 A schematic diagram of the circuit structure of a control cabinet provided in an embodiment of this application is shown;

[0019] Figure 3 A schematic diagram of the communication structure of a control cabinet provided in an embodiment of this application is shown.

[0020] Explanation of key component symbols:

[0021] QF1, DC circuit breaker; FU1, first DC fuse; FU2, first AC fuse; FU3, second AC fuse; FU4, third AC fuse; FU5, first sub-fuse; FU6, second sub-fuse; FU7, third sub-fuse; FU8, fourth sub-fuse; JY, insulation tester; ZLDB, DC meter; JCPCS, inverter; DKQ, reactor; SCQF, AC circuit breaker; SPD1, surge protector. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0023] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] In the following, the terms “comprising,” “having,” and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as excluding, firstly, the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations thereof.

[0025] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0027] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] Reference Figure 1 , Figure 1 A schematic diagram of the frame structure of a control cabinet for an energy storage device provided in this embodiment includes:

[0029] The system includes control area equipment and power area equipment, with the control area equipment electrically connected to both the energy storage device and the power area equipment. Both the control area equipment and the power area equipment are housed in a control cabinet, which can be arranged vertically or horizontally. The control cabinet can be made of galvanized steel sheet, and the control area equipment and power area equipment are separated by metal partitions, such as... Figure 1 As shown by the black lines, the metal partition prevents interference between the two. The control area equipment mainly includes the control board of the energy storage device. The control board is mainly responsible for the charging and discharging control, speed regulation and energy dispatch of the energy storage device, and also monitors the mechanical status of the energy storage system, such as bearing vibration and speed, as well as electrical parameters, such as voltage and current.

[0030] Various status indicator lights can be installed on the outside of the control cabinet to display the working status of each component in the control cabinet. Multiple ventilation openings and ventilation channels can also be installed on the control cabinet to dissipate heat. A heater can also be installed at the bottom of the control cabinet to raise the temperature of the control cabinet when the temperature inside the control cabinet is lower than the preset temperature threshold, so as to avoid the low temperature affecting the operation of the control cabinet.

[0031] Reference Figure 2 , Figure 2 This is a schematic diagram of a circuit structure provided in this embodiment.

[0032] The power zone equipment includes a DC circuit breaker QF1, a first DC fuse FU1, an inverter JCPCS, a reactor DKQ, and an AC fuse. One end of the DC circuit breaker QF1 is electrically connected to the power grid, and the other end of the DC circuit breaker QF1 is electrically connected to the first DC fuse FU1. The first DC fuse FU1 is electrically connected to the input terminal of the inverter JCPCS, the output terminal of the inverter JCPCS is electrically connected to the reactor DKQ, the reactor DKQ is electrically connected to the AC fuse, and the AC fuse is electrically connected to the energy storage device.

[0033] like Figure 2 As shown, the FCS cabinet is the control cabinet. The main circuit of the control cabinet is powered by an external power source through the DC bus of the power grid. The external power source needs to be connected to the DC circuit breaker QF1 of the control cabinet through a converter. The DC circuit breaker QF1 is mainly used to provide overload and short circuit protection for the main circuit of the control cabinet. When an overload or short circuit current is detected in the main circuit of the control cabinet, the main circuit of the control cabinet is directly cut off to protect the safety of the control cabinet.

[0034] The DC circuit breaker QF1 is then connected to the first DC fuse FU1. The function of the first DC fuse FU1 is to cut off the circuit by melting the fuse element when the current in the circuit exceeds a specified value, thereby protecting the equipment and lines from damage caused by short circuits or overloads. Using a single protective device may fail if the device malfunctions; therefore, this embodiment improves the circuit safety of the control cabinet through the dual protection of the DC circuit breaker QF1 and the first DC fuse FU1.

[0035] The first DC fuse FU1 is then connected to the inverter JCPCS. The inverter JCPCS mainly converts the DC power supplied by the grid into AC power and adapts to the power demand of different scenarios, so as to realize the efficient use of power and protect the safety of the control cabinet.

[0036] The inverter JCPCS is then connected to the reactor DKQ and a fuse. The reactor DKQ is then connected to the energy storage device. The reactor DKQ mainly uses the principle of electromagnetic induction to limit changes in short-circuit current and inrush current. Since the energy storage device in this application is mainly a flywheel energy storage device, the fuse can be an AC fuse. Because the output terminal of the inverter JCPCS is directly connected to the flywheel energy storage device, and the output terminal is AC, an AC fuse is installed at the output terminal of the inverter JCPCS for short-circuit protection of the device. The AC fuse includes a first AC fuse FU2, a second AC fuse FU3, and a third AC fuse FU4. The three AC fuses are respectively connected to the power input terminal, load output terminal, and control system input terminal of the flywheel energy storage device. The fuse mainly works by overheating and melting the fuse element when a short circuit occurs, thus protecting both the control cabinet and the flywheel energy storage device.

[0037] This embodiment integrates multiple components of the energy storage device, such as circuit breakers, relays, and control boards, into a single control cabinet, making the control of the energy storage device more efficient. Moreover, when any component fails, the faulty component can be quickly located through the control cabinet, improving maintenance efficiency.

[0038] In one embodiment, the flywheel energy storage device is connected to an external braking resistor via a parallel cable connected to an AC circuit breaker SCQF.

[0039] Braking resistors can be single resistors or integrated into a braking resistor box. The main function of a braking resistor is to convert the regenerative electrical energy generated by the motor during braking into heat energy, thereby achieving rapid braking of the motor. A braking resistor box, through proper configuration and integration of braking resistors, can perform this function more efficiently, while also providing better heat dissipation, insulation, and protection performance.

[0040] The main function of an AC circuit breaker (SCQF) is to automatically cut off the power supply when a circuit experiences overload, short circuit, or undervoltage faults, in order to protect electrical equipment and lines. It also has the functions of power distribution and circuit control.

[0041] This embodiment uses a braking resistor to quickly brake the flywheel energy storage device, and uses an AC circuit breaker SCQF to control whether the braking resistor needs to intervene in the flywheel energy storage system, so that the energy stored in the flywheel can be released through the braking resistor in case of an emergency.

[0042] In one embodiment, the control area equipment includes a surge protector SPD1 and a second DC fuse, wherein the surge protector SPD1 is electrically connected to a DC copper busbar provided on the DC busbar through the second DC fuse.

[0043] Surge protectors (SPD1) primarily protect equipment in control cabinets, such as DC circuit breakers (QF1) and lines, from damage caused by transient overvoltages, such as voltage spikes caused by accumulation or switching operations. They can quickly discharge abnormal currents and limit voltage within safe ranges. Additionally, they can be used for lightning current protection. Since equipment may be located outdoors, in the event of thunderstorms, induced lightning currents from direct or side strikes can be quickly released to prevent them from affecting the entire control equipment area, thus protecting the electrical equipment.

[0044] The second DC fuse includes a first sub-fuse FU5 and a second sub-fuse FU6. One end of the first sub-fuse FU5 is connected to the incoming end of the DC bus, and the other end of the first sub-fuse FU5 is connected to the surge protector SPD1. One end of the second sub-fuse FU6 is connected to the outgoing end of the DC bus, and the other end of the second sub-fuse FU6 is connected to the surge protector SPD1.

[0045] In one embodiment, the control area device includes an uninterruptible power supply, a 24V switching power supply, and a control board, wherein the uninterruptible power supply is electrically connected to the 24V switching power supply, and the 24V switching power supply is electrically connected to the control board.

[0046] The control board is powered by a 24V switching power supply. The uninterruptible power supply can maintain the continuous power supply to critical equipment in the control cabinet, such as the control board, when the power grid fails, thereby avoiding the impact of power outages on the normal operation of the energy storage equipment.

[0047] In one embodiment, the control area device includes a DC meter ZLDB, which is electrically connected to the incoming side of the power grid for voltage sampling and then current sampling via a Hall current sensor. The DC meter ZLDB is mainly powered by an auxiliary power supply device.

[0048] The ZLDB DC meter is connected to the incoming side of the DC bus via the third sub-fuse FU7 and to the outgoing side of the DC bus via the fourth sub-fuse FU8. The ZLDB DC meter can monitor the voltage, current, and power parameters of the DC bus of the power grid in real time, and can also count the charging and discharging of the energy storage system.

[0049] In one embodiment, the control area device includes an insulation detector JY, one end of which is electrically connected to the positive terminal of the DC output of the power grid, and the other end of which is electrically connected to the negative terminal of the DC output of the power grid.

[0050] The JY insulation tester is mainly used to detect the insulation resistance between the positive and negative DC poles, thereby ensuring the safety of the circuit between the positive and negative DC poles.

[0051] Reference Figure 3 , Figure 3 This is a schematic diagram of the communication structure of a control cabinet provided in this embodiment.

[0052] In one embodiment, the control cabinet further includes an industrial control panel and a temperature and humidity controller. The temperature and humidity controller is located inside the control cabinet, and the industrial control panel is communicatively connected to the DC meter ZLDB, the insulation detector JY, and the temperature and humidity controller. The communication connection can primarily be achieved via a 485 cable.

[0053] The industrial control screen can display the parameters of the DC meter ZLDB, the insulation tester JY, and the temperature and humidity controller, allowing staff to view the parameters of each instrument in real time.

[0054] The industrial control panel is also connected to a switch via a network cable. The switch, in turn, is connected to the intelligent gateway serial server and control board via network cables. The control board is connected to the machine-side control board, which is a separate control board for the inverter's JCPCS. The control board acquires parameters from relevant equipment in the energy storage system and displays them on the industrial control panel, allowing staff to view these parameters in real time.

[0055] Secondly, this application provides an energy storage system, including an energy storage device and a control cabinet as described in the above embodiments.

[0056] It is understood that the energy storage system in this embodiment corresponds to the control cabinet of the energy storage system in the above embodiment. The options in the above embodiment are also applicable to this embodiment, so they will not be described again here.

[0057] In the various embodiments of this application, the functional modules or units can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0058] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A control cabinet for an energy storage device, characterized in that, include: The system includes control area equipment and power area equipment. The control area equipment is electrically connected to both the energy storage equipment and the power area equipment. The power area equipment includes a DC circuit breaker, a first DC fuse, an inverter, a reactor, and an AC fuse. One end of the DC circuit breaker is electrically connected to the power grid, and the other end is electrically connected to the first DC fuse. The first DC fuse is electrically connected to the input terminal of the inverter, and the output terminal of the inverter is electrically connected to the reactor. The reactor is electrically connected to the AC fuse, and the AC fuse is electrically connected to the energy storage equipment.

2. The control cabinet of the energy storage device according to claim 1, characterized in that, The energy storage device includes a flywheel energy storage device, which is connected to an external braking resistor via a parallel cable.

3. The control cabinet of the energy storage device according to claim 1, characterized in that, The control area equipment includes a surge protector and a second DC fuse, wherein the surge protector is electrically connected to the DC circuit breaker via the second DC fuse.

4. The control cabinet of the energy storage device according to claim 1, characterized in that, The control area equipment includes an uninterruptible power supply, a 24V switching power supply, and a control board. The uninterruptible power supply is electrically connected to the 24V switching power supply, and the 24V switching power supply is electrically connected to the control board.

5. The control cabinet of the energy storage device according to claim 4, characterized in that, The control area equipment includes a DC meter, which is electrically connected to the incoming side of the power grid and performs data sampling.

6. The control cabinet of the energy storage device according to claim 5, characterized in that, The control area equipment also includes an insulation detector, one end of which is electrically connected to the positive terminal of the DC output line of the power grid, and the other end of which is electrically connected to the negative terminal of the DC output line of the power grid.

7. The control cabinet of the energy storage device according to claim 6, characterized in that, The control cabinet also includes an industrial control panel, which is communicatively connected to the control board, the DC meter, and the insulation detector.

8. The control cabinet of the energy storage device according to claim 7, characterized in that, The control cabinet also includes a temperature and humidity controller, which is located inside the control cabinet and is communicatively connected to the industrial control panel.

9. An energy storage system, characterized in that, It includes energy storage devices and a control cabinet as described in any one of claims 1-8.

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