A Quasi-Z-Source Inverter with a Network Capacitor-Inductor

Abstract

In this research, a new Z-source inverter inspired by the quasi-inductor-switched Z-source inverter is presented. The new inverter has an acceptable boost factor, and gain voltage compared to the similar Z-source inverter. Also, in this new topology, the capacitors’ voltage stress has been decreased compared to similar inverters. In this converter, a capacitor is replaced with the side diodes of the quasi-Z-source inverter. The input current in this inverter is continuous and it is a low figure that at the moment of switching off about 54 A (V
_in = 120 V). The high inrush current damages the converter components. The operation of this inverter has been checked in different modes and the voltage and current equations of all elements have been calculated. The new converter can be extended to n-cascade, and it makes to achieve a higher boost factor with a low-duty cycle. The ingredients used in the new topology are fewer than those of the switched-inductor Z-source inverter. The analysis and extraction of all voltage stress such as capacitors, diodes, switches, all currents such as inductors, dc-link average, inrush current, voltage gain and boost factor of the new topology have been done and compared with other structures. The DC-link voltage (V
_i) is 148 V with an input voltage of 120, so the boost factor is 1.43.