A Comparative Study of Recent Discontinuous Modulation Techniques for Three-Phase Impedance Source Inverter

Abstract

Since the Z-Source Inverter (ZSI) was first proposed in 2003, impedance source inverters (ISI) have experienced a rapid progress. This evolution is not limited to developing network topologies, but also involves their modulation and control techniques to improve their performance and efficiency from different aspects. Accordingly, discontinuous PWM (DZPWM) techniques gained substantial attension in the last few years due to their advantages compared with continuous modulation schemes. The aim of this paper is to study, analyse, and compare three recent DZPWM methods for the Zsource/ quasi-Z-source inverter (qZSI). The operating principal of each DZPWM technique has been presented and analyzed. Moreover, a comparative investigation based on the inductor current ripple, voltage gain, power loss, and some other factors has been carried-out. Finally, computer simulations using MATLAB/Simulink and PLECS softwares have been performed to evaluate the presented DZPWM techniques. Such a comparative analysis helps researchers and designers to choose for their ISI modulation strategy for their application.