Inverter Two-Level PWM Harmonic Enhancement Based on Phase Shift Tuning Technique

Abstract

Frequency harmonic reduction and elimination is a vital field of research due to its importance in minimizing the percentage of total harmonic distortion in power systems. The two-level Pulse Width Modulation (PWM) method of AC generation is with less sophisticated control circuitry requirement compared to higher level PWM techniques. This paper is proposing a new control methodology with a reduced harmonic spectrum. The new trend here is to manipulate the PWM two-level reference waveform by duplicating the generation process with a tuned phase shifting added to the reference waveform. The new technique results in a harmonic reduction of the unfiltered output with about 50% compared to that of the conventional Bipolar SPWM.