“SELECTIVE HARMONIC ELIMINATION”

Abstract

Selective Harmonic Elimination (SHE) is a widely used technique in power electronic converters to mitigate the detrimental effects of harmonics on system performance. Harmonics, which are undesired sinusoidal components occurring at frequencies that are multiples of the fundamental frequency, can lead to waveform distortion, increased losses, and interference with other electronic devices. The SHE technique selectively eliminates specific harmonics from the output waveform by precisely controlling the switching instants of the converter. This research project focuses on investigating the theory and implementation of Selective Harmonic Elimination for square wave inverters, which commonly produce harmonically rich waveforms due to the abrupt transitions in the output voltage. The primary objective of this study is to design a selective harmonic elimination pulse width modulation (SHE PWM) controller for square wave inverters to reduce the Total Harmonic Distortion (THD) present in the output waveform. The research project aims to develop an effective SHE algorithm capable of selectively eliminating specific harmonics while preserving the desired characteristics of the output waveform.