Study on the Fault Mechanism of Submodules in Modular Multilevel Converters

Modular multilevel converters (MMCs) have been widely used in medium and high voltage direct current transmission, new energy grid connection, and other applications due to their advantages of modular structure design, easy expansion, and high output waveform quality. Submodule failures are the most...

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Bibliographic Details
Published in2024 43rd Chinese Control Conference (CCC) pp. 4816 - 4821
Main Authors Yang, Yuqing, Hu, Guozhen, Zhang, Xiong, Ke, Longzhang
Format Conference Proceeding
LanguageEnglish
Published Technical Committee on Control Theory, Chinese Association of Automation 28.07.2024
Subjects
Circuit faults
fault Mechanisms
Insulated gate bipolar transistors
Integrated circuit modeling
Mathematical models
Modular Multilevel Converter
Multilevel converters
submodules
Topology
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Summary:Modular multilevel converters (MMCs) have been widely used in medium and high voltage direct current transmission, new energy grid connection, and other applications due to their advantages of modular structure design, easy expansion, and high output waveform quality. Submodule failures are the most common faults in MMC. Analyzing the fault mechanism of submodules is of great significance for subsequent fault diagnosis. This paper first introduces the working principle of the submodule, analyzes three working states and six modes of the submodule. Then, the current flow path and capacitance voltage variation trends and characteristics of submodules after open circuit faults occurred in switching devices T1 and T2 studied, as well as short circuit faults occurred in T 1 and T 2 . An 11 level MMC simulation model was built on Matlab/Smiulink to verify the effectiveness of the analysis results.
ISSN:1934-1768
DOI:10.23919/CCC63176.2024.10661487