The power quality impact of cycloconverter control strategies

Yazhou Liu, Gerald Thomas Heydt, Ron F. Chu

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


A cycloconverter is a power electronic device used to convert constant voltage constant frequency AC power to adjustable voltage adjustable frequency AC power without a DC link. Cycloconverters inject significant harmonics and non-standard frequency components (i.e., noninteger multiples of the power frequency) into power systems. The impact of cycloconverters on power quality is studied, and the relationships between power quality indices and cycloconverter control strategies are developed. Control strategies are proposed to minimize the power quality impact of the cycloconverters. An innovative group frequency concept is introduced. This is a technique whereby many frequency components in the cycloconverter voltage and current spectra are collapsed into several group frequencies, and the power quality impact of the group frequencies is the same as that of the full spectrum of the cycloconverter signals. Some concepts are illustrated by simulation, and some by measurement at a twelve pulse cycloconverter load.

Original languageEnglish (US)
Pages (from-to)1711-1718
Number of pages8
JournalIEEE Transactions on Power Delivery
Issue number2 II
StatePublished - Apr 2005


  • Cycloconverter
  • Harmonics
  • Power electronic control
  • Power electronics
  • Power quality

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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