Direct Torque Control of Inverter Fed Three Phase Induction Motor by Implementing Fuzzy Logic Controller

Abstract

This paper presents direct torque controlled (DTC) induction motor drive that employs SVPWM inverter and Fuzzy Logic Controller (FLC). Direct torque control technique is robust and fast responding approach used to obtain high performance torque control of induction machine drives. Conventional DTC has certain drawbacks like variable switching frequency and high torque ripple due to hysteresis comparators. The DTC with SVPWM inverter has constant switching frequency and low torque ripples. As the conventional PI control requires continuous tuning of gain, so optimization of performance is difficult. So Fuzzy Logic Controller (FLC) technique is proposed to get high performance. The PI and fuzzy logic techniques in speed control loop are successfully implemented in MATLAB/Simulink.