Transient analysis of AC/DC converters input waveforms using wavelet

Abstract

During last decade, power quality problems have become one of the most intensive studied areas of power engineering. Fourier transformation (FT) and especially its digital form - Fast Fourier transform was usually used for power quality analysis. Unfortunately, this transform has its drawbacks. During last years, a novel technique for signal processing emerged in engineering practice - Wavelet Transform. Wavelets are limited duration signals with zero average value. The aim of this paper is to present transient analysis of digitally controlled AC/DC converter input waveforms, since the AC/DC converter is the most common harmonic 'polluter' of the power supply.