Induction Motor Control using SVPWM Quasi Z Source Current Fed Inverter

Abstract

This paper presents the simulation model for speed control of induction motor using SVPWM Quasi Z source inverter. Here the DC input voltage is boosted by using quasi Z network and the output of the quasi Z source network is applied to the three phase SVM based inverter. The variable voltage, variable frequency AC output of the inverter is used to control the speed of the induction motor. The simulation results with R load and induction motor load are considered for analysis. The three phase LC filter is suggested at the output to reduce the harmonics. The THD of SVM based drive system is compared with that of the SPWM inverter based system. The proposed system performance is tested using MATLAB/SIMULINK. IV. CONCLUSIONThe SVM based QZSI system with resistive load and induction motor load are designed, modelled and results are presented. The simulation results indicate that the output is higher with SVPWM based inverter system. The THD is as minimum as 4.9% in the proposed system. The advantages of the proposed system are reduced number of switches and reduced number of passive elements. The disadvantage is that the quasi Z source network requires a coupled inductor. The present work deals with comparison of SPWM and SVM based induction motor drive systems.