Advanced Pulse Width Modulation technique for Z-Source Inverter

Abstract

This paper presents a new Pulse Width Modulation (PWM) technique for Z-source or Impedance Source Inverter (ZSI or ISI). The proposed technique is based on the Bus Clamping PWM (BCPWM) technique for Voltage Source Inverter (VSI). The effectiveness of the proposed technique is achieved by MATLAB simulation of a ZSI. It has been observed that the proposed technique gives better performances as compared to Conventional Space Vector PWM (CSVPWM) at high modulation index and at same switching frequency like reduction in load current ripple and reduction in voltage stress across the switches. Further the proposed technique ensures less switching loss as compared to CSVPWM at same carrier frequency.