High-voltage filtering device for medium-voltage direct-hanging energy storage system

Abstract

The utility model relates to a high-voltage filtering device for a medium-voltage direct-hanging energy storage system, which is characterized in that the input end of a circuit breaker is connected with a direct-current bus of a battery, and the output end of the circuit breaker is sequentially connected with a charging and discharging loop, a direct-current filter reactor and a heat dissipation loop; the input end of the circuit breaker is provided with a current Hall sensor, the output end of the current Hall sensor is connected with the battery cluster management module, and the current Hall sensor is used for detecting the current of the battery cluster; and the battery cluster management module is connected with the input end of the circuit breaker. The utility model has the advantages that the input end of the direct current circuit breaker is connected with the battery direct current bus, the battery direct current bus is connected with the battery cluster, and the battery cluster is connected with the battery cluster management module, so that an operator can inquire the information of the battery cluster in real time and timely open and close the direct current circuit breaker, the structure is simple, and the implementation is easy; and the battery cluster management module and the direct-hanging energy storage system are respectively connected with the switch through port optical fibers, so that high-voltage isolation and long-distance data information transmission are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, and in particular to a high-voltage filter device for a medium-voltage direct-mounted energy storage system. Background Art

[0002] Medium-voltage direct-mounted energy storage systems, with their significant advantages, such as large single-unit capacity and reduced floor space, have attracted widespread attention in renewable energy generation, power supply, and grid-side applications. These systems typically operate in 3kV to 35kV power systems. Each converter is connected one-to-one with each battery cluster, and the operating ground suspension voltage between the converter and battery system is 3kV to 35kV. The high-voltage filter boxes used in traditional low-voltage energy storage solutions are not suitable for medium-voltage direct-mounted energy storage systems, primarily due to concerns about high-voltage isolation and long-distance communication. High-voltage filter devices typically use CAN communication to communicate with the PCS (Power Control System, energy storage converter) and battery cluster management module to manage the batteries. However, CAN communication suffers from poor data processing capabilities, poor anti-interference capabilities, and slow response speed, necessitating improvements to the high-voltage filter devices. Summary of the Invention

[0003] The purpose of this utility model is to provide a high-voltage filtering device for a medium-voltage direct-mounted energy storage system. A DC circuit breaker is used to connect the battery DC busbar to the energy storage converter PCS of the direct-mounted energy storage system, which is safe and reliable to operate. A switch optical fiber is used to connect the battery cluster management module and the direct-mounted energy storage system, which realizes high-voltage isolation, has strong anti-interference ability and fast response speed, and improves power supply safety and reliability.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A high-voltage filter device for a medium-voltage direct-mounted energy storage system includes a circuit breaker, a charge-discharge circuit, a battery cluster management module, a DC filter reactor, and a heat dissipation circuit. The input end of the circuit breaker is connected to the battery DC bus, and the output end of the circuit breaker is connected to the charge-discharge circuit, the DC filter reactor, and the heat dissipation circuit in sequence.

[0006] A current Hall effect sensor is provided at the input end of the circuit breaker, and the output end of the current Hall effect sensor is connected to the battery cluster management module through a port. The current Hall effect sensor is used to detect the battery cluster current; the battery cluster management module is connected to the input end of the circuit breaker through a port to detect the voltage of the battery DC bus.

[0007] The charge and discharge circuit includes a pre-charge switch, a pre-charge resistor, and a bypass switch. The pre-charge switch and the bypass switch are connected in parallel, and the pre-charge switch and the pre-charge resistor are connected in series.

[0008] The heat dissipation circuit includes a fan switching power supply and a heat dissipation fan, and the fan switching power supply is used to supply power to the heat dissipation fan.

[0009] It also includes a switching power supply and a DC switch. The input end of the circuit breaker is connected to the input end of the DC switch, and the output end of the DC switch is connected to the input end of the switching power supply. The switching power supply is used to power the battery cluster management module.

[0010] The battery DC bus is connected to the battery cluster, which includes several battery boxes. The battery DC bus is connected to the battery cluster management module, and the battery cluster is connected to the battery DC bus. The battery cluster management module is used to drive the circuit breaker on and off.

[0011] A fuse is connected between the input end of the circuit breaker and the battery DC busbar. The circuit breaker is a 2P DC circuit breaker.

[0012] The output end of the DC filter reactor is connected to the energy storage converter PCS of the direct-mounted energy storage system. The DC filter reactor is used to suppress the harmonics in the DC ripple output by the battery cluster.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The input end of the DC switch is connected to the input end of the DC circuit breaker, and the output end of the DC switch is connected to the input end of the switching power supply. The switching power supply adopts the battery DC bus power supply mode, which can provide a stable power supply to the battery cluster management module, with a simple structure and easy installation;

[0015] 2. The input end of the DC circuit breaker is connected to the battery DC bus, the battery DC bus is connected to the battery cluster, and the battery cluster is connected to the battery cluster management module. The operator can query the battery cluster information in real time and open and close the DC circuit breaker in time. The structure is simple and easy to implement;

[0016] 3. The output end of the DC circuit breaker of the high-voltage filter device is connected in sequence to the charge-discharge circuit and the DC filter reactor. The charge-discharge circuit prevents the battery cluster current from impacting the energy storage converter PCS when it is first powered on. The DC filter reactor can suppress the DC ripple output by the battery cluster.

[0017] 4. A DC switch is placed between the battery DC bus and the switching power supply to prevent direct connection between the switching power supply and the battery DC bus, as the electronic components in the switching power supply will consume the battery power. This also facilitates the removal of the battery cluster management module.

[0018] 5. The heat dissipation fan can dissipate heat to the high-voltage filter device at any time, thereby increasing the service life of the equipment in the high-voltage filter device;

[0019] 6. Using current Hall effect sensors, maintenance personnel can check the battery cluster current status and understand the battery cluster DC power at any time;

[0020] 7. The battery cluster management module and the direct-mounted energy storage system are connected to the switch through port optical fibers, achieving high-voltage isolation and long-distance data information transmission;

[0021] 8. The DC circuit breaker is equipped with electric operation, which improves the safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the principle of a high-voltage filter device used in a medium-voltage direct-mounted energy storage system.

[0023] Figure 2 This is a schematic diagram of a high-voltage filter box for a high-voltage filter device used in a medium-voltage direct-mounted energy storage system.

[0024] Figure 3 This is a schematic diagram of the communication structure of the filter device used in the direct-mounted energy storage system.

[0025] In the figure: 1-DC filter reactor 2-pre-charging switch 3-pre-charging resistor 4-bypass switch 5-fan switching power supply 6-cooling fan 7-DC circuit breaker 8-fuse 9-current Hall effect sensor 10-DC switch 11-switching power supply 12-switch 13-battery cluster management module 14-on / off indicator light 15-power on / off button. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0027] The following examples are implemented under the premise of the technical solution of the present utility model, and provide detailed implementation methods and specific operating processes, but the scope of protection of the present utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0028] [Example 1]

[0029] See Figure 1A high-voltage filter device for a medium-voltage direct-mounted energy storage system includes a DC circuit breaker 7, a charge and discharge circuit, a battery cluster management module 13, a DC filter reactor 1, a heat dissipation circuit, a switching power supply 11, and a DC switch 10. The input end of the DC circuit breaker 7 is connected to the input end of the DC switch 10, and the output end of the DC switch 10 is connected to the input end of the switching power supply 11. The switching power supply 11 is used to supply power to the battery cluster management module 13; a fuse 8 is connected between the input end of the DC circuit breaker 7 and the battery DC bus. The DC circuit breaker 7 is a 2P DC circuit breaker 7. The output end of the DC circuit breaker 7 is connected to the DC bus. The secondary connection includes a charge and discharge circuit, a DC filter reactor 1, and a heat dissipation circuit; the charge and discharge circuit includes a pre-charge switch 2, a pre-charge resistor 3, and a bypass switch 4. The pre-charge switch 2 and the bypass switch 4 are connected in parallel, and the pre-charge switch 2 and the pre-charge resistor 3 are connected in series; the heat dissipation circuit includes a fan switching power supply 5 and a heat dissipation fan 6. The fan switching power supply 5 is used to power the heat dissipation fan 6, and the heat dissipation fan 6 is used to dissipate heat from the filter device; the output end of the DC filter reactor 1 is connected to the energy storage converter PCS of the direct-mounted energy storage system. The DC filter reactor 1 is used to suppress harmonics in the DC ripple output by the battery cluster. The DC circuit breaker 7's input is equipped with a current Hall effect sensor 9. The output of this Hall effect sensor 9 is connected to a battery cluster management module 13 via a port. This current Hall effect sensor 9 is used to detect the battery cluster current. The battery cluster management module 13 is connected to the battery DC busbar at the DC circuit breaker 7's input to detect the battery DC busbar voltage. The battery DC busbar is connected to a battery cluster, which contains several battery boxes. The battery cluster is connected to the battery cluster management module 13, which is used to activate and deactivate the DC circuit breaker 7. The battery cluster management module 13 is connected to a switch 12 via a network cable. The switch converts LAN signals into optical signals. These signals are then connected to an optical-to-LAN switch in the energy storage system's control cabinet via optical fiber, enabling data exchange between the battery cluster management module 13 and the direct-hung energy storage system. The battery cluster management module 13 is model ESBCM-F133-L-S_HV5.0.1, but other models are also acceptable.

[0030] Working process:

[0031] The battery is always charged, so the battery cluster outputs power to the DC bus. At this time, the DC switch 10 is closed, the switching power supply 11 is powered, the switch 12 and the battery cluster management module 13 are powered. At this time, the battery cluster management module detects the voltage of the DC bus through the connection between the battery cluster management module and the DC bus, and detects the current on the DC bus through the current Hall effect sensor 9. After the voltage and current are normal, the battery cluster management module controls the closing of the DC circuit breaker 7 through electrical operation. After the DC circuit breaker 7 is closed normally, it will be fed back to the battery cluster management module through the signal feedback point. The battery cluster management module is connected to the switch through the network cable interface. The switch is used to convert the LAN signal into an optical signal. The optical fiber is connected to the optical-to-LAN switch in the control cabinet of the energy storage system for communication. The communication information is that the DC circuit breaker is closed normally. At this time, the control cabinet in the energy storage system controls the closing of the pre-charging contactor through the energy storage converter PCS, and then the pre-charging contactor is opened and the bypass contactor is closed. At this time, the DC filter reactor is energized to suppress the DC ripple output by the battery cluster. At this time, the fan switch power supply is energized, and the cooling fan starts to dissipate heat for the high-voltage filter device. At this time, the DC bus has been fully connected to the input side of the energy storage converter PCS.

[0032] [Example 2]

[0033] See Figure 2 The front panel of the high-voltage filter box includes the electrical operation of the DC circuit breaker 7, the DC switch 10, and the switch 12. The operator opens the high-voltage filter box and opens / closes the DC circuit breaker 7 through the electrical operation of the DC circuit breaker 7. The operation is convenient and quick. The DC switch 10 is equipped with a shunt trip. The DC switch 10 is equipped with a shunt trip. The DC switch 10 is opened / closed by the battery cluster management module, without manual opening / closing, which improves safety. The switch 12 has an optical port. The controller of the direct-hanging energy storage system is connected to the switch 12 network cable through an optical fiber. The battery cluster management module 13 is connected to the switch 12 through a port, so that the battery cluster management module 13 and the controller of the direct-hanging energy storage system can realize long-distance data exchange. The front panel is provided with a secondary terminal board, and the terminal board is equipped with wiring terminals. The signal line is led out to the secondary wiring terminal through the control line in the box, which is convenient for maintenance personnel to check the line.

[0034] The input end of the DC switch of the utility model is connected to the input end of the DC circuit breaker, and the output end of the DC switch is connected to the input end of the switching power supply. The switching power supply adopts the battery DC bus power supply mode, which can provide a stable power supply to the battery cluster management module, has a simple structure and is easy to install; the input end of the DC circuit breaker is connected to the battery DC bus, the battery DC bus is connected to the battery cluster, and the battery cluster is connected to the battery cluster management module. The operator can query the information of the battery cluster in real time and open and close the DC circuit breaker in time. The structure is simple and easy to implement; the output end of the DC circuit breaker of the high-voltage filter device is connected to the charging and discharging circuit and the DC filter reactor in sequence. The charging and discharging circuit prevents the current of the battery cluster from impacting the energy storage converter PCS when the power is first turned on. The DC filter reactor can suppress the DC ripple output by the battery cluster; a DC switch is set between the battery DC bus and the switching power supply to prevent the switching power supply from being directly connected to the battery DC bus, because the electronic components in the switching power supply will consume the battery power, and it also facilitates the removal of the battery cluster management module; a cooling fan can dissipate heat from the high-voltage filter device at any time, thereby increasing the service life of the equipment in the high-voltage filter device; a current Hall effect sensor is used, so maintenance personnel can check the battery cluster current status and understand the battery cluster DC power at any time; the battery cluster management module and the direct-mounted energy storage system are respectively connected to the switch through port optical fiber, realizing high-voltage isolation and long-distance data information transmission; the DC circuit breaker is equipped with an electric operator to improve operational safety.

Claims

1. A high-voltage filter device for a medium-voltage direct-mounted energy storage system, characterized in that: It includes a circuit breaker, a charge and discharge circuit, a battery cluster management module, a DC filter reactor, and a heat dissipation circuit. The input end of the circuit breaker is connected to the battery DC bus, and the output end of the circuit breaker is connected to the charge and discharge circuit, the DC filter reactor, and the heat dissipation circuit in sequence. The input end of the circuit breaker is provided with a current Hall sensor, the output end of which is connected to the battery cluster management module via a port. The current Hall sensor is used to detect the battery cluster current; the battery cluster management module is connected to the input end of the circuit breaker via a port. The battery cluster management module is used to detect the voltage of the battery DC bus.

2. A high-voltage filter device for a medium-voltage direct-mounted energy storage system according to claim 1, characterized in that: The charge and discharge circuit includes a pre-charge switch, a pre-charge resistor, and a bypass switch. The pre-charge switch and the bypass switch are connected in parallel, and the pre-charge switch and the pre-charge resistor are connected in series.

3. The high-voltage filter device for a medium-voltage direct-mounted energy storage system according to claim 1, characterized in that: The heat dissipation circuit includes a fan switching power supply and a heat dissipation fan, and the fan switching power supply is used to supply power to the heat dissipation fan.

4. A high-voltage filter device for a medium-voltage direct-mounted energy storage system according to claim 1, characterized in that: It also includes a switching power supply and a DC switch. The input end of the circuit breaker is connected to the input end of the DC switch, and the output end of the DC switch is connected to the input end of the switching power supply. The switching power supply is used to power the battery cluster management module.

5. The high-voltage filter device for a medium-voltage direct-mounted energy storage system according to claim 1, characterized in that: The battery DC bus is connected to a battery cluster, which includes several battery boxes. The battery DC bus is connected to a battery cluster management module, which is used to drive the circuit breaker on and off.

6. The high-voltage filter device for a medium-voltage direct-mounted energy storage system according to claim 1, characterized in that: A fuse is connected between the input end of the circuit breaker and the battery DC busbar, and the circuit breaker is a 2P DC circuit breaker.

7. The high-voltage filter device for a medium-voltage direct-mounted energy storage system according to claim 1, characterized in that: The output end of the DC filter reactor is connected to the energy storage converter PCS of the direct-mounted energy storage system. The DC filter reactor is used to suppress harmonics in the DC ripple output by the battery cluster.

8. The high-voltage filter device for a medium-voltage direct-mounted energy storage system according to claim 1, characterized in that: It also includes a switch, a battery cluster management module and a direct-mounted energy storage system, which are respectively connected to the switch through port optical fibers.

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