Novel Multi Tone-Spwm Technique (Mt-Spwm) Using Reference Window And Frequency Optimization

Due to the vitality of the SPWM technique in industry of the power conversion devices, this paper suggests a new harmonic distortion minimization technique so far called multitone SPWM. This proposed technique aims to inject the modulating waveform with a high frequency component at the low voltage regions (edges of the waveform) to increase number of switching pulses at these regions and hence increase power content of the fundamental component of the output spectrum based on a power redistribution concept. Optimization process was accomplished on the technique key parameters and a considerable of a 21% reduction was achieved in THD% compared with the traditional unipolar SPWM technique.