Modified PI-SVM for quasi Z-source inverter under balanced load conditions

Abstract

This paper presents a performance of improved space vector modulation technique (SVM) for quasi Z-Source B4 inverter to drive a three phase balanced load. The improved SVM manage to produce a balanced three phase output voltage under non-linear load condition compared to the previous work where it only works in resistive load condition. The improved SVM considers the switching sequence in four different sectors while previous SVM technique for this topology consider the switching sequence in two different sectors only. The initial simulation results obtained from the MATLAB/Simulink showed that the proposed system is capable to produce a balanced output voltage under three phase balanced load conditions. A small signal modelling were also proposed to support the modulation technique for this topology to work under unbalanced load condition in future work.