New switching strategy controlling a new three-level voltage source inverter

M. H. Saied*, M. Z. Mostafa, T. M. Abdel-Moneim, H. A. Yousef

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper presents a new switching strategy controlling a new three-level voltage source inverter, resulting in different 25 space voltage-vectors. The new inverter combines some desirable features of two and three-level inverters. The proposed open-leg switching strategy intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed states becomes 64 compared to 27 originally proposed by other modulation strategies. For a wye-connected load operating at low modulation index (M<0.5 p.u.), the output phase-voltage becomes a seven-level, 12-step waveform, instead of the 6-step one. Thus, the total harmonic distortion is highly reduced. Three new conduction-modes are presented, each verifies a reduced common-mode-voltage time-variation [dv/dt), low third harmonic content, and reduced switching frequency harmonics. For higher modulation indexes, a 4 th conduction mode is presented, eliminating the low frequency harmonics in the neutral-point current, consequently reducing the dc-link capacitors sizes, and cost. Analytical models, computer simulation results, and experimental verification are presented.

Original languageEnglish
Pages (from-to)297-308
Number of pages12
JournalAEJ - Alexandria Engineering Journal
Issue number3
Publication statusPublished - May 2007
Externally publishedYes


  • 150° conduction-mode
  • Neutral point clamped
  • Three-level converter
  • Total harmonic distortion
  • Voltage source inverters

ASJC Scopus subject areas

  • General Engineering


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