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MMC converter sub-module open-circuit fault positioning method and device

A technology of open circuit fault and positioning method, which is applied in the direction of continuity test, etc., can solve the problems of low positioning efficiency, cumbersome positioning process, long execution cycle, etc., and achieve the effect of speeding up investigation and positioning, cumbersome solution process, and improving positioning efficiency

Active Publication Date: 2021-03-26
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a method and device for locating an open-circuit fault of an MMC converter sub-module, which is used to solve the technical problem of low positioning efficiency caused by the cumbersome process of the existing open-circuit fault locating method and the long execution period

Method used

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  • MMC converter sub-module open-circuit fault positioning method and device
  • MMC converter sub-module open-circuit fault positioning method and device
  • MMC converter sub-module open-circuit fault positioning method and device

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Embodiment Construction

[0048] The embodiment of the present application provides a method and device for locating open-circuit faults of MMC converter sub-modules, which are used to solve the technical problems of low locating efficiency caused by the cumbersome process and long execution period of the existing open-circuit fault locating methods.

[0049] In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the following The described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0050...

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Abstract

The invention discloses an MMC converter sub-module open-circuit fault positioning method and a device, and the method comprises the steps: dividing a to-be-detected sub-module which may have a faultinto an input group and a cut-off group, judging whether a current cut-off phenomenon exists or disappears in each control period, judging the polarity of a bridge arm current if the bridge arm current exists, excluding normal sub-modules in the to-be-detected sub-module set continuously, so that the to-be-detected sub-module set is reduced; positioning the fault sub-module finally, switching theto-be-identified normal or faulty sub-module selectively, accelerating troubleshooting and positioning of the faulty sub-module when facing a single fault, and increasing the sub-module positioning efficiency. The technical problem that an existing open-circuit fault positioning mode is tedious in process and long in execution period, and consequently positioning efficiency is low is solved.

Description

technical field [0001] The present application relates to the technical field of modular multilevel converters, in particular to a method and device for locating open-circuit faults of sub-modules of MMC converters. Background technique [0002] Modular multilevel converter (MMC) has the advantages of no need for a large number of IGBTs in series, low device withstand voltage change rate, and low output waveform harmonic content. It has been widely used in asynchronous interconnection of AC power grids, wind farm access, offshore Platform power supply and other fields. At present, most of the flexible HVDC projects under construction in the world use modular multilevel converter valves. When a sub-module open circuit fault occurs in the half-bridge MMC converter, although the entire bridge arm will not fail, the output voltage of the bridge arm deviates from the expected value, which will cause problems such as phase-to-phase commutation and large harmonic content on the AC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54
CPCG01R31/54
Inventor 马燕君张俊峰梁晓兵安然然
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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