A Single-Phase Quasi-Z-Source based Seven-Level Inverter with Capacitor Voltage Balancing

Abstract

—In this paper a Quasi-Z-source based seven level inverter is proposed. The output capacitor of the quasi-Z source network is split into four parts to generate the levels with minimum number of switches. A switch sharing based auxiliary circuit with proportional-integral (PI) controller is used to balance the capacitor voltages. Simulation of the proposed inverter is performed in MATLAB SIMULINK environment for R load and the simulation results show that the auxiliary circuit can balance the proposed Quasi-Z-source based seven level inverter and the simulation results are presented.