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Bypass switch driving device of MMC valve sub-module

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

Active Publication Date: 2021-04-13
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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  • Bypass switch driving device of MMC valve sub-module
  • Bypass switch driving device of MMC valve sub-module
  • Bypass switch driving device of MMC valve sub-module

Examples

Experimental program
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Embodiment 1

[0025] The invention provides a bypass switch driving device of an MMC valve sub-module, which is used to provide a drive current for a control coil of a bypass switch; 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 to an external power supply through an 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 Connect to ground through 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. The output end of th...

Embodiment 2

[0037] The invention provides a bypass switch driving device of an MMC valve sub-module, such as Figure 6 As shown, on the basis of the above device embodiment 1, the bypass switch drive device also includes a conventional trigger circuit and a voltage conversion circuit; Figure 7 As shown, the external power supply is connected to the charging energy storage circuit and a voltage conversion circuit through the anti-reverse diode D1, and the control power is output through the voltage conversion circuit 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 terminal is used to connect the MMC valve sub-module controller to receive the driving signal, such as Figure 8 As shown, the IGBT drive circuit is an optocoupler drive circuit, includin...

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Abstract

The invention relates to the technical field of power electronics, and especially relates to a bypass switch driving device of an MMC valve sub-module. The device comprises a driving output port and a protection trigger circuit, the protection trigger circuit comprises a thyristor driving circuit and a protection thyristor (S2), and the input end of the thyristor driving circuit is used for being connected with a capacitor of the MMC valve sub-module through a voltage division circuit. The output end of the thyristor driving circuit is connected with the control electrode of the protective thyristor (S2); and the protective thyristor (S2) is connected in series with the driving output port. The voltage of the capacitor of the MMC valve sub-module is acquired as a signal to output a driving signal through the thyristor driving circuit, so that the conduction of a driving current in a control coil of the bypass switch is controlled, the bypass switch acts without being influenced by an external control signal, the driving circuit does not need to be powered by a low-voltage power supply, influence factors of control are reduced, reliability of action of the bypass switch is improved, and safe operation of the whole valve system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a bypass switch drive device for an MMC valve sub-module. Background technique [0002] As an important topology of flexible HVDC converter valves, MMC often adopts a half-bridge or full-bridge structure for each sub-module, and each bridge arm is often composed of dozens or even hundreds of MMC valve sub-modules connected 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, the topology of the half-bridge sub-module and the topology of the full-bridge sub-module are respectively; when a serious fault occurs in a sub-module, the faulty sub-module can be removed quickly through the action of the bypass switch, otherwise the safe operation of the entire valve system will be jeopardized. Therefore, ensuring the reliable operation of the bypass switch has bec...

Claims

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Application Information

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Patent Type & Authority Applications(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