Title :
The power quality impact of cycloconverter control strategies
Author :
Liu, Yazhou ; Heydt, Gerald Thomas ; Chu, Ron F.
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
fDate :
4/1/2005 12:00:00 AM
Abstract :
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 nonstandard 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.
Keywords :
AC-AC power convertors; power conversion harmonics; power supply quality; adjustable voltage adjustable frequency AC power; constant voltage constant frequency AC power; cycloconverter control strategies; cycloconverter load; group frequency concept; harmonics; nonstandard frequency components; power electronic device; power quality; power quality impact; Cement industry; Displacement control; Frequency conversion; Power electronics; Power quality; Power system harmonics; Pulse measurements; Rectifiers; Thyristors; Voltage control; Cycloconverter; harmonics; power electronic control; power electronics; power quality;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2004.834350