Neutral-point voltage balancing method for three-level inverter systems with a time-offset estimation scheme

Ui Min Choi, Kyo Beum Lee

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

This paper presents a neutral-point voltage balancing method for three-level inverter systems using a time-offset estimation scheme. The neutral-point voltage is balanced by adding a time-offset to the turn-on time of the switches. If an inaccurate time-offset is added, the neutral-point deviation still remains. An accurate time-offset is obtained through the proposed time-offset estimation scheme. This method is implemented without additional hardware, complex calculations, or analysis. The effectiveness of the proposed method is verified by experiments.

Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalJournal of Power Electronics
Volume13
Issue number2
DOIs
StatePublished - Mar 2013

Keywords

  • Multilevel
  • Neutral-point voltage balancing
  • NPC inverter

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