A method and device for locating open-circuit faults of sub-modules of mmc converters

An open-circuit fault and locating method technology, applied in the direction of continuity testing, etc., can solve the problems of low locating efficiency, long execution period, cumbersome locating method and process, etc.

Active Publication Date: 2022-03-01
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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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

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  • A method and device for locating open-circuit faults of sub-modules of mmc converters
  • A method and device for locating open-circuit faults of sub-modules of mmc converters
  • A method and device for locating open-circuit faults of sub-modules of mmc converters

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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

This application discloses a method and device for locating open-circuit faults of sub-modules of MMC converters. This application divides sub-modules that may have faults to be detected into two groups of input and removal, and judges the phenomenon of current interruption in each control cycle. Whether it exists or disappears, if the bridge arm current exists, judge the polarity of the bridge arm current, and constantly exclude the normal submodules in the set of submodules to be detected, thereby reducing the set of submodules to be detected, and finally locate the faulty submodule, through selective Ground switching of normal or faulty sub-modules to be identified can speed up the troubleshooting and location of faulty sub-modules in the face of a single fault, improve the efficiency of sub-module positioning, and solve the cumbersome process of the existing open-circuit fault location method, which is difficult to execute The long period leads to the technical problem of low positioning efficiency.

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...

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Application Information

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Patent Type & Authority Patents(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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