Analysis of inverter circuit of Sinusoidal Pulse Width Modulation with keystone waveform

摘要

Third harmonic is usually combined with the standard sinusoidal signal to increase the DC voltage utilization within the Sinusoidal Pulse Width Modulation (SPWM) based inventers. The inverter of SPWM with 3rd keystone waveform was analyzed and the one with which to get the best DC voltage utilization ratio was presented. Two inverters of SPWM with these two different waveforms were simulated in Matlab. And the conclusion is that the Total Harmonic Distortion (THD) of line voltage from the inverter of SPWM with keystone waveform is smaller than the one from the inverter of SPWM with 3rd harmonic.