A simple method for the valuation of the harmonics generated by multilevel converters

This paper deals with a new simple method for the valuation of the voltage and current harmonics generated by multilevel converters. This method is based on some properties reminded in this article. It is shown that on the basis of the knowledge of the 2-level PWM waveform and spectrum it is possible to obtain precise information about multilevel waveforms. The way to compute easily the voltage and current harmonic distortion factors (THD) is shown. Finally an estimation of the error introduced by the proposed method is given.