Control of Traction Motor and Accessories in Electric Vehicle using Multi Source Converter

Abstract

Multi-source converters using multiple energy sources to supply the electric vehicle (EV) and its accessories have gained attraction amongst researchers recently. These converters offer elimination of dc-dc converters, hence improving efficiency by reducing size and weight. This paper presents, a multi-source converter operated in inverter mode using different pulse width modulation (PWM) techniques such as sine PWM, indirect field-oriented control with PWM and space vector modulation (SVM). Induction motor is used as a traction motor and supplied directly from the main battery. The auxiliary battery is used for operating the accessories in normal condition and to run the traction motor during emergency conditions when main battery depletes. This arrangement not only increases the life cycle of main battery but also provides solution during breakdown of main battery in EV. The performance simulation results for all the techniques mentioned above are presented using MATLAB-Simulink. The space vector modulation shows efficient dc link utilization with reduced total harmonic distortion (THD) as well as easy implementation. Scale down experimental setup is used to verify proposed hypothesis. The simulation as well as experimental results of desired performance during speed increment and decrement of induction motor is presented using SVM technique to demonstrate the proof of the proposed control.