New PWM Strategy for Quasi-Z-Source Three-Level T-Type Inverter with Inductor Current Ripple Reduction

Abstract

The topology of a three-level quasi Z-source T Type inverter (qZST2I) is presented in this paper. This circuit is combined with two symmetrical quasi-Z source networks with T-type inverter to operate a shoot-through (ST) mode, in which both power switches in the same leg can be switched on at the same time, is avoided. A new pulse-width modulated (PWM) control method is used to reduce the ripple of input inductor current by the technique of shifting the reference signal and duty cycle (D), the total shoot-through time remains constant. The simulation and experimental results demonstrate the efficiency of the 3L-qZST2I inverter topology and control methods.