Dual-Buck AC-AC Converter with Inverting and Non-Inverting Operations

Usman Ali Khan, Ashraf Ali Khan, Honnyong Cha, Heung Geun Kim, Juyong Kim, Ju Won Baek

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

In this paper, a novel buck-boost ac-ac converter is proposed. The basic switching unit of the proposed converter is a unidirectional buck circuit; therefore, it has no shoot-through worries. It can achieve safe commutation without using RC snubbers or soft commutation strategies. It can be implemented with power MOSFETs without their body diodes conducting and, for current freewheeling external diodes, can be used to minimize the reverse recovery issues and related loss. It has a bipolar voltage gain with both inverting and non-inverting operations. The non-inverting operation can be used to compensate voltage sag, and inverting operation can be used to compensate voltage swell. Therefore, the proposed converter as a dynamic voltage restorer is capable of compensating for both voltage sag and swell in a wide range. The detailed theoretical analysis followed by detailed experimental results of a 300-W prototype converter is provided.

Original languageEnglish
Article number8272429
Pages (from-to)9432-9443
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume33
Issue number11
DOIs
StatePublished - Nov 2018

Keywords

  • AC-AC converter
  • bipolar voltage gain
  • commutation
  • dual-buck
  • dynamic voltage restorer (DVR)
  • MOSFET
  • reliability

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