Neutral-point voltage control for a three-level DC-AC inverter using equivalent-input-disturbance approach

Jie Zhang, Ryuichi Yokoyama, Jinhua She, Win Wu

Research output: Contribution to journalArticle

3 Citations (Scopus)


One problem with a single source three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral leg, the control problem of neutral-point voltage is converted to a disturbance rejection problem. This method suppresses the variation of the neutral-point voltage to a low level and reduces the capacity of DC-link capacitors. Simulation results show the effectiveness of the method.

Original languageEnglish
Pages (from-to)183-189
Number of pages7
JournalDianli Xitong Baohu yu Kongzhi/Power System Protection and Control
Issue number1
Publication statusPublished - 2013 Jan 1



  • Disturbance
  • EID
  • Inverter
  • Multi-level
  • Neutral-point voltage

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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