Modelling and Simulation of V/F Controlled Induction Machine Fed by Very Sparse Matrix Converter involving Space Vector Strategies

Abstract

Very Sparse Matrix Converters (VSMCs) are a reduced-switch version of conventional AC-AC conversion systems, but have not been extensively explored with respect to their influence on the dynamic performance of Induction Motor (IM) drives. In this study, the goal is to develop a closed-loop V/F controlled induction machine using a VSMC and to compare the performance of two modulation techniques, namely, Conventional Space Vector Modulation (CSVM) and Indirect Space Vector Modulation (ISVM), for such an application. To enable the system to be evaluated under the same operating conditions, a comprehensive two-axis mathematical model of the induction motor and converter system was implemented in Matlab/Simulink. The performance was evaluated under step changes in the reference and load torque, especially transient performance, such as settling time, rising time, peak overshoot, undershoot, and DC link voltage utilization. It was observed that ISVM contributed to better voltage transfer capability and faster dynamic response, whereas CSVM presented smooth torque evolution with less oscillatory behavior. The results presented here point to some practical compromises between the transient smoothness and response speed of the modulation strategies for VSMC-fed induction motors. The results provide a dynamic comparison approach for good modulation decisions for medium-performance industrial induction motors.