Capacitor Condition Monitoring Based on the DC-Side Start-Up of Modular Multilevel Converters

Zhongxu Wang*, Yi Zhang, Huai Wang, Frede Blaabjerg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

9 Citations (Scopus)
36 Downloads (Pure)

Abstract

This letter proposes a new submodule capacitor condition monitoring method for modular multilevel converters (MMCs) based on the dc-side start-up procedure. During this process, the MMC can be simplified into an RC charging circuit, and the submodule capacitance can be estimated by investigating its relationship with the phase current and submodule voltage. Several practical issues related to the implementation, advantages, and limitations of the proposed method are presented as well. In order to validate the method, a series of experiments with different submodule capacitances are conducted based on a three-phase MMC platform. Experimental results confirm the effectiveness and feasibility of the proposed method.

Original languageEnglish
Article number8918114
JournalIEEE Transactions on Power Electronics
Volume35
Issue number6
Pages (from-to)5589-5593
Number of pages5
ISSN0885-8993
DOIs
Publication statusPublished - Jun 2020

Keywords

  • Capacitor
  • condition monitoring (CM)
  • modular multilevel converters (MMCs)

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