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A bypass switch drive device for mmc valve sub-module

A bypass switch and drive device technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as unreliable protection action of bypass switches, achieve the effect of ensuring safe operation, reducing influencing factors, and improving reliability

Active Publication Date: 2022-07-22
XUJI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a bypass switch drive device for the MMC valve sub-module to solve the problem of unreliable protection action of the bypass switch for driving the MMC valve sub-module.

Method used

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  • A bypass switch drive device for mmc valve sub-module
  • A bypass switch drive device for mmc valve sub-module
  • A bypass switch drive device for mmc valve sub-module

Examples

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Embodiment 1

[0025] The present invention provides a bypass switch driving device of an MMC valve sub-module, which is used to provide driving current for a control coil of the bypass switch; such as image 3 As shown, the bypass switch driving device includes a protection trigger circuit and a charging energy storage circuit; the charging energy storage circuit, such as Figure 4 As shown, it includes a charging resistor R1 and an energy storage capacitor C1, one end of the charging resistor R1 is used to connect the external power supply through the anti-reverse diode D1, and the other end of the charging resistor R1 is connected to the first end of the control coil of the bypass switch, and Ground through the storage capacitor C1.

[0026] The protection trigger circuit includes a thyristor drive circuit and a protection thyristor S2. The input end of the thyristor drive circuit is used to connect the capacitor C0 of the MMC valve sub-module through a voltage divider circuit, and the ou...

Embodiment 2

[0037] The present invention provides a bypass switch driving device of an MMC valve sub-module, such as Image 6 As shown, on the basis of the above-mentioned device embodiment 1, the bypass switch driving device further includes a conventional trigger circuit and a voltage conversion circuit; such as Figure 7 As shown, the externally powered power supply connects the charging energy storage circuit and a voltage conversion circuit through the anti-reverse diode D1, and the voltage conversion circuit outputs the control power supply to supply power for the IGBT drive circuit.

[0038] The conventional trigger circuit includes a photoelectric conversion circuit, an IGBT drive circuit and an IGBT device S1. The photoelectric conversion circuit is provided with an optical receiving module OPT1, and its optical signal input end is used to connect to the MMC valve sub-module controller to receive driving signals, such as Figure 8 As shown, the IGBT drive circuit is an optocouple...

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Abstract

The invention relates to the technical field of power electronics, in particular to a bypass switch drive device of an MMC valve sub-module, comprising a drive output port and a protection trigger circuit, the protection trigger circuit includes a thyristor drive circuit and a protection thyristor (S2). The input terminal is used to connect the capacitor of the MMC valve sub-module through the voltage divider circuit, and the output terminal of the thyristor driving circuit is connected to the control pole of the protection thyristor (S2); the protection thyristor (S2) is connected in series with the driving output port. By obtaining the voltage of the capacitor of the MMC valve sub-module as a signal, the thyristor driving circuit outputs the driving signal, and then controls the conduction of the driving current in the control coil of the bypass switch, so that the bypass switch operates, which is not affected by the external control signal, The drive circuit also does not require low-voltage power supply, which reduces the influencing factors of control, improves the reliability of the bypass switch action, and ensures the safe operation of the entire valve system.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a bypass switch driving device of an MMC valve sub-module. Background technique [0002] As an important topology of flexible HVDC converter valve, each sub-module of MMC often adopts a half-bridge or full-bridge structure, and each bridge arm is often composed of dozens or even hundreds of MMC valve sub-modules in series. In order to ensure the normal operation of the converter valve, each sub-module is equipped with a bypass switch K, such as figure 1 and figure 2 As shown, they are the half-bridge sub-module topology and the full-bridge sub-module topology respectively; when a sub-module has a serious fault, the faulty sub-module is quickly removed by the action of the bypass switch, otherwise the safe operation of the entire valve system will be endangered. Therefore, ensuring the reliable operation of the bypass switch becomes an important issue. [0003] There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/06H02M1/32
CPCH02M1/06H02M1/32
Inventor 田世克董朝阳陈同浩夏克鹏朱全胜任改玲肖彬王晓丽张锐雍进玲
Owner XUJI GRP