Unified non-inverting and inverting PWM AC-AC converter with versatile modes of operation

Peng Li, Yihua Hu

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
122 Downloads (Pure)


This paper proposes unified non-inverting and inverting AC-AC converter (UNI-AC) using pulse width modulation (PWM) for the utility voltage compensation. It offers four effective switching states to regulate the output voltage in bipolar manner, facilitating versatile modes of operation with different number of switching states being modulated. Each mode of the proposed UNI-AC is able to compensate both the grid voltage sag and swell problems due to its bipolar voltage gain. The operational principle and comparison for all these modes are investigated in details. Also, the UNI-AC is reversible and compatible with full range of power factor. Other technical merits offered by the proposed approach include the compact hardware installation, reduced switch voltage stress (also low dv/dt) and decreased control complexity. Detailed analysis and experimental verification are presented in this paper.
Original languageEnglish
Pages (from-to)1137 - 1147
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number2
Early online date6 Oct 2016
Publication statusPublished - 1 Feb 2017


  • bipolar voltage grain
  • PWM direct ac-ac converter
  • utility voltage compensation
  • versatile modes of operation
  • pulse width modulation
  • control complexity
  • switch voltage stress


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