Optimal duty ratio controller for improved DTFC of induction motor using Fuzzy logic

The aim of this paper is to develop an optimal duty ratio controller to improve dynamic performance of induction motor with reduction in Torque and Flux ripple using Fuzzy logic. The major disadvantage of conventional DTFC is High torque and flux ripples and variable switching frequency. In DTFC with duty ratio controller concept of duty cycle is introduced, instead of applying a selected voltage vector for the entire switching period if applied for a portion of the switching period determined by optimal duty cycle [20]. A PWM based duty ratio controller is introduced in conventional DTFC. The duty cycle can be optimized using fuzzy logic. The improved performance and effectiveness of DTFC with Fuzzy DRC compared to SDRC is evaluated using Matlab-Simulink environment.