Simplified center aligned SVPWM for multi-phase inverter using voltage dispersion

Abstract

In this paper a simplified Centre aligned Space Vector Pulse Width Modulation (SVPWM) using voltage dispersion is proposed for a two-level n-phase inverter having odd number of phase. The conventional SVPWM algorithm for calculating the dwell time requires Clarke transformation, sector identification, identification of large and middle vectors in each sector and assigning dwell time to it. In the proposed dispersion Space Vector PWM (d-SVPWM), dwell time is calculated based on sorting the sampled amplitude of reference voltage without any complex process like Clarke transformation, sector identification. In this paper five-phase inverter is taken as an example case of multi-phase inverter. The simulation and hardware results of five-phase inverter are presented and this validates the performance of proposed algorithm. In short the proposed algorithm is another way to implement SVPWM for n-phase inverter in a much simplified manner.