Quasi-two-level and three-level operation of a diode-clamped multilevel inverter using space vector modulation

Grain Philip Adam, Stephen Finney, O. Ojo, Barry Williams

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

This study presents space vector-based quasi-two-level operation of a diode-clamped multilevel inverter which improves dc link utilisation and output voltage quality, and avoids the dc link capacitor voltage balancing problem experienced with standard multilevel operation. Beside a review of quasi-two-level operation and the capacitor voltage balancing method, the study presents a detailed discussion on the implementation of space vector modulation and the selection of switching sequence for a five-level inverter. Additionally, the condition for maximum theoretical modulation index for space vector modulation is established. A prototype five-level diode-clamped inverter is to experimentally validate the approach. Also this study extends the concept of quasi-two-level-to-three-level operation of the diode-clamped multilevel inverter in order to address the shortcomings experienced with quasi-two-level operation, such as low waveform quality and high switching losses. The validity of three-level inverter operation is confirmed experimentally on a prototype of a five-level diode-clamped inverter. The study also highlights the limitations of three-level operation of a diode-clamped multilevel inverter.

Original languageEnglish
Pages (from-to)542 - 551
Number of pages10
JournalIET Power Electronics
Volume5
Issue number5
DOIs
Publication statusPublished - May 2012

Keywords

  • capacitor voltage balancing method
  • diode clamped multilevel inverter
  • quasi-two-level operation
  • space vector modulation
  • voltage quality

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