HARMONIC ELIMINATION FOR SUPER – MULTIPLE OF SUPPLY FREQUENCY CONVERTER BASED ON DISCRETE AMPLITUDE MODULATION BY USING DOUBLE SHIFT COMB FILTER TECHNIQUE

Abstract

One of most important challenge that face industrial electronics is to enhance the performance of converters used switching device. This paper gives a sufficient method to reduce total harmonic distortion for super- multiple of supply frequency based on converting (50) Hz to (400) Hz, this method depends upon comb filter technique, by shifting the main supply by suitable two angles phase shift using two phase shifting transformers and applying these sources to three converters to create three distorted ( 400) Hz waveforms each one have different displacement angle, three waveforms added to gather in order to create new 400Hz has low distorted waveform, applying this method will reduce the THD from 70% to 36 %.