Development of DC magnetization prevention control for a zero-sequence-cancelling modular multilevel converter

Kenta Watanabe, Masaya Ichinose, Jun Narushima, Takahiko Kikui, Shigenori Inoue, Shuji Katoh

Research output: Contribution to journalArticlepeer-review

Abstract

This paper proposes a DC magnetization prevention control in the zero-sequence-cancelling modular multilevel converter (ZC-MMC) as a buffer reactor-less MMC circuit topology. Using the leakage inductance of a zig-zag transformer, the transformer can function as a buffer reactor. By applying a zig-zag connection, DC magnetic flux caused by the zero-sequence DC current flowing through the transformer can be canceled. On the contrary, the core of the transformer is DC-magnetized when a non-zero-sequence DC current is flowing through the transformer. The transformer abnormally heats due to the magnetic saturation of the core caused by DC magnetization. To prevent DC magnetization, DC magnetization prevention control in ZC-MMC was proposed. Using a simulation model and 1-kW experimental setup, DC magnetization prevention control was confirmed.

Original languageEnglish
Pages (from-to)284-295
Number of pages12
JournalIEEJ Transactions on Industry Applications
Volume139
Issue number3
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • DC magnetization
  • Modular multilevel cascade converter
  • Zero-sequence current
  • Zig-zag winding transformer

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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