MMC (multi-media card)-HVDC (high-voltage direct-current transmission) sub-module bypass switch testing device

Abstract

The invention provides an MMC (multi-media card)-HVDC (high-voltage direct-current transmission) sub-module bypass switch testing device. The device comprises an interface module, a master control module, a display module and a power module, wherein the interface module is connected with a bypass switch; the master control module is used for detecting action time of the bypass switch; the display module is used for judging whether the action time of the bypass switch is qualified or not; and the power module is used for supplying power for the interface module, the master control module and the display module. By the MMC-HVDC sub-module bypass switch testing device, the action time comprising closing time, bounce time and return time of the bypass switch can be accurately and quickly detected, and whether the bypass switch meets requirements of the MMC-HVDC sub-module or not can be judged.

Description

technical field [0001] The invention relates to a test device, in particular to a test device for an MMC-HVDC sub-module bypass switch. Background technique [0002] Modular multi-level flexible DC transmission system is different from traditional DC transmission system. Its smallest unit is the sub-module of the converter valve, and the bypass switch is an indispensable key component of the sub-module. Its main functions are reflected in the two Two aspects: on the one hand, when the overcurrent suffered by the submodule exceeds a certain threshold, the bypass switch is triggered to prevent the switching device of the submodule from being damaged due to overcurrent; on the other hand, a submodule of the flexible DC converter valve fails. Afterwards, the sub-module is bypassed by issuing a command to close the bypass switch, thereby eliminating the impact of the fault on the system. If the bypass switch cannot be closed quickly and accurately, the faulty sub-module is consi...

AI Technical Summary

Problems solved by technology

Each sub-module based on the half-bridge topology is equipped with a bypass switch, so the number of bypass switches in the high-voltage and large-capacity flexible DC converter station is huge, and the task of bypass switch detection is heavy.

The bypass switch test and detection link may affect the commissioning time of the high-voltage large-capacity flexible DC converter station

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