Space-vector pulsewidth modulation for three-level NPC converter with the neutral point voltage control

Arkadiusz Lewicki, Zbigniew Krzeminski, Haitham Abu-Rub

Research output: Contribution to journalArticle

114 Citations (Scopus)


This paper proposes a new space-vector pulsewidth modulation (SV-PWM) strategy for a three-level neutral point clamped inverter. The presented SV-PWM strategy makes it possible to control the neutral point voltage by optimum choice of switch sequence for any position and length of output voltage vector. The proposed solution takes into consideration the unbalance of the dc-link voltages. It also analyzes the influence of vector sequences on the predicted unbalance of the dc-link voltage. The solution allows selecting optimum vectors and their on-time durations in order to reduce quickly the dc-link voltage unbalance. The calculation of the space vector area proposed in this paper takes into consideration voltage unbalance and its influence on the length and position of vectors. The proposed approach assures properly generating the voltage output vectors, even in the case of the existing large voltage unbalance in the dc-link. The results of the experimental investigation of the proposed modulation strategy are presented in this paper.

Original languageEnglish
Article number5720308
Pages (from-to)5076-5086
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number11
Publication statusPublished - Nov 2011



  • Multilevel inverter
  • neutral point clamped (NPC) inverter
  • neutral point voltage control
  • pulsewidth modulation (PWM)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering

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