At present, SPWM (Sinusoidal Pulse Width Modulation) control technology has been widely used in power electronic inverter. Theoretically, improve the inverter switching frequency can reduce the output waveform of the harmonic and improve the waveform quality. However, switch frequency increases will further increase the switch loss. In the lower switching frequencies, in order to reduce the harmonic distortion of the inverter output waveform. Various of SPWM control strategy is put forward,and have widely application. The control is based on triangle SPWM sine wave after comparing with the carrier to determine the intersection of switch power inverter,how to calculate the switch points is a difficulty in SPWM signal generated, and also a hot research subject in current. This article discusses the principle of SPWM control and the current widely used several sampling methods (natural sampling, Regular sampling, irregular sampling),use of MATLAB software simulation the several sampling method, comparative analysis of the advantages and disadvantages of these different sampling methods and the output voltage harmonic components, better inhibit and eliminate the harmonic voltage output, in order to achieve optimal effect.
Keywords: Sinusoidal pulse width modulation,Control principle,Sampling method, MATLAB simulation,Harmonic analysis