Comparison of two different modulations and conduction loss analysis for single-phase two-level rectifier

Abstract

The operating theory of single-phase two-level pulse width modulation (PWM) rectifiers is analyzed and the mathematical model is established. In order to reduce switching losses, a single-phase two-level space vector pulse width modulation (SVPWM) strategy and a single-phase two-level carrier PWM strategy with zero-sequence voltage injection are presented in this paper. Their design methods are given in detail. Through theoretical analysis and calculation, the SVPWM and PWM with zero-sequence voltage injection are found to be the same type of pulse width modulation method essentially. And then this paper analyzes and compares the conduction losses for two-level rectifier for the SVPWM and sinusoidal pulse width modulation (SPWM) with zero-sequence voltage injection. Finally, simulation results and conduction loss calculation verify the consistency of the two PWM strategies.