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Direct-current transformer solid-state switch circuit, air-cooled solid-state switch module and fault protection system and method

A technology of DC transformers and solid state switches, used in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection devices for automatic disconnection, circuit devices, etc.

Active Publication Date: 2021-05-18
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the water-cooled solid-state switch has the characteristics of strong heat dissipation, strong flow capacity, and low noise, the water-cooled solid-state switch is only suitable for the scenario where the DC transformer shares the water machine for heat dissipation when the power module is water-cooled

Method used

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  • Direct-current transformer solid-state switch circuit, air-cooled solid-state switch module and fault protection system and method
  • Direct-current transformer solid-state switch circuit, air-cooled solid-state switch module and fault protection system and method
  • Direct-current transformer solid-state switch circuit, air-cooled solid-state switch module and fault protection system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0054] This embodiment introduces a solid-state switching circuit suitable for a DC transformer, which can be installed on the low-voltage line side of the DC transformer, and used to effectively isolate the fault when the busbar on the low-voltage side fails.

[0055] refer to figure 1 As shown, the solid-state switching circuit consists of a controller ( figure 1 not shown), the DC bus, the IGBT switch unit connected in series between the valve side of the positive DC bus and the low-voltage line side, the first freewheeling diode D connected in parallel between the positive bus and the negative DC bus on the low-voltage line side, and connected in parallel to the valve Collect the discharge resistance R and DC capacitance C between the busbar and the DC negative busbar; when the IGBT switch unit is turned off, it can isolate the DC transformer valve side and the low-voltage line side, where the low-voltage line side is the first freewheeling diode D connected side.

[005...

Embodiment approach

[0063] For the implementation of the solid-state switch body involving the bus current sensor, the external communication terminal of the controller can be designed as a fiber optic communication port. The communication port transmits a line fault signal to the external valve control system, and receives the external command signal returned by the external valve control system in response to receiving the line fault signal. In this embodiment, whether the solid-state switch controls the on-off of the IGBT switch unit is determined by the external command signal, which simplifies the control logic of the solid-state switch controller and reduces its calculation load. Of course, the controller can also directly control the IGBT switch unit of the main body to switch off according to the bus current signal detected by the bus current sensor of the solid-state switch of the main body.

[0064] In this embodiment, the IGBT unit is composed of at least two IGBT switch tubes connecte...

Embodiment 2

[0067] Based on the same inventive concept as Embodiment 1, this embodiment introduces an air-cooled solid-state switch module using the solid-state switch circuit in Embodiment 1.

[0068] refer to Figure 2 to Figure 4 As shown, the air-cooled solid-state switch module includes a housing 1, a solid-state switch circuit and an air-cooled assembly; the air-cooled assembly includes an air-cooled radiator 10, and the air-cooled radiator 10 is installed on the inner wall of the housing 1;

[0069] In the solid-state switching circuit, the DC bus, the IGBT switch unit, the first freewheeling diode 8 , the discharge resistor 7 , the DC capacitor 6 and the controller 3 are all installed in the housing 1 and fixedly connected to the air-cooled radiator 10 .

[0070] The air-cooled assembly also includes an air duct 11 installed on the housing 1 and connected to the air-cooled radiator 10 ; at least one cooling fan 12 is installed on the air duct 11 .

[0071] The air-cooled solid-st...

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Abstract

The invention discloses a solid-state switch circuit suitable for a direct-current transformer, an air-cooled solid-state switch module and a fault protection system, and the solid-state switch circuit comprises an IGBT switch unit which is connected in series with a direct-current positive bus, a first fly-wheel diode, a discharge resistor and a direct-current capacitor which are connected in parallel between the direct-current positive bus and a direct-current negative bus, and a controller; the controller controls the on-off state of the IGBT switch unit according to a received external instruction signal or a line operation state signal, and can control the IGBT switch unit to disconnect the line when the line where the solid-state switch is located breaks down. After the solid-state switch is shut down, the fly-wheel diode can carry out freewheeling on short-circuit current, the discharging resistor carries out discharging on the direct-current capacitor, and the direct-current capacitor can provide direct-current voltage support. The solid-state switch has the characteristic of stable operation during steady-state operation and fault current-limiting operation. The air-cooled solid-state switch module can be conveniently expanded during application, and the power supply reliability of a user is guaranteed when the low-voltage side of the direct-current transformer is short-circuited.

Description

technical field [0001] The invention relates to the technical field of power distribution equipment, in particular to an air-cooled solid-state switch circuit, module, and fault protection system and method for a DC transformer based on IGBT parallel topology. Background technique [0002] At present, the solid-state switches in the DC transformer low-voltage current-limiting cabinet can be divided into two types according to the cooling method: air-cooled and water-cooled. Although the water-cooled solid-state switch has the characteristics of strong heat dissipation, strong flow capacity, and low noise, the water-cooled solid-state switch is only suitable for the scenario where the DC transformer shares the water machine for heat dissipation when the power module is water-cooled. When the capacity of the DC transformer is small (less than 2M), considering the advantages of lower cost of the fan than the water machine and convenient maintenance, most of the power modules of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04H02H3/087H02H9/02H05K7/20
CPCH02H7/04H02H3/087H02H9/021H05K7/20136
Inventor 袁宇波张宸宇刘云庞清帅李奔袁晓冬杨景刚史明明刘瑞煌葛雪峰缪惠宇姜云龙
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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