By-pass switch trigger device of MMC flexible direct-current electronic module

Abstract

The invention discloses a by-pass switch trigger device of an MMC flexible direct-current electronic module. The by-pass switch trigger device comprises an energy storage circuit and a trigger circuit, wherein the energy storage circuit is used for being connected with a power supply, the trigger circuit is used for being connected with a closing coil of a by-pass switch, and the energy storage circuit and the trigger circuit are connected with each other. A switching tube is serially connected in the trigger circuit, a control end of the switching tube is used for driving a trigger signal end of a circuit connection submodule controller through the switching tube, a trigger control switch is connected between the control end of the switching tube and the ground, and the state of a main contact of the trigger control switch is consistent with the state of a main contact of the by-pass switch. By means of the by-pass switch trigger device, a control end of the switching tube driving circuit is connected with the trigger control switch and used for switching off the switching tube after the by-pass switch is switched on, so that a power requirement on the switching tube is reduced, and the size is decreased. The trigger device is integrated in the submodule controller, therefore, malfunction caused by interference of lower-pressure control signals of the switching tube when the lower-pressure control signals of the switching tube are connected through long leads is avoided, and capacity of resisting interference is improved.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission, and in particular relates to a trigger device for a bypass switch of an MMC flexible direct current transmission electronic module. Background technique [0002] Each bridge arm of the MMC flexible direct current transmission converter valve usually consists of hundreds of such as figure 1 The MMC flexible direct current transmission sub-modules shown are connected in series. When a sub-module fails, the faulty sub-module must be removed quickly through the bypass switch K to keep the system running. Once the bypass switch cannot be reliably closed, the fault will further expand, and the system will eventually be required to trip and shut down. When the controller of the flexible DC sub-module fails to correctly send the closing signal of the bypass switch, whether the bypass switch can operate reliably becomes a difficult problem. [0003] In addition, because the bypass swi...

AI Technical Summary

Problems solved by technology

Once the bypass switch cannot be reliably closed, the fault will further expand, and the system will eventually be required to trip and shut down

When the controller of the flexible DC sub-module fails to correctly send the closing signal of the bypass switch, whether the bypass switch can operate reliably becomes a difficult problem

[0003] In addition, because the bypass switch needs tens of amperes of current to close, the switch tube of the bypass switch trigger device is relatively large, so the drive circuit can only be integrated on the bypass switch, and then the sub-module controller sends the signal through a long lead wire. The low voltage control signal is transmitted to the control terminal of the bypass switch

However, the existence of long leads makes the bypass switch susceptible to malfunction due to interference from external conditions, causing the number of redundant sub-modules to reach the specified value, which will also cause the system to trip and shut down

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