A new cascaded quasi-z source based single phase seven level inverter

Abstract

This paper presents a new quasi-z source based single phase seven level inverter for residential applications. This topology interfaces two separate quasi-z source DC-DC (qZs) networks between DC source and multilevel inverter with reduced switches. This topology uses two different controllers for qZs networks and seven level inverter to regulate both AC and DC bus voltages under input voltage disturbances, reference DC link voltage variations and dynamic load variation with enhanced reliability and power density. One cycle control method(OCC) is used for the control of peak DC link voltage in qZs networks and Multi-carrier SPWM technique for seven level output voltage generation. The performance of the proposed topology is developed in MATLAB/Simulink environment and the results are presented for different loads.