Abstract:
The Direct Torque Control (DTC) strategy is one of the best strategies of speed control of Induction Motor Drive (IMD). This scheme is simple in structure and produces fast and robust response in A.C drive system. How ever, this scheme is encountered with the possible problems of high torque, flux and current ripples. The deviation of electromagnetic torque from its reference value causes vibration and noise which reduces the efficiency of the drive. The Genetic Algorithm is recently getting growing importance in soft control applications. This paper focuses on the simulation of a Direct Torque Controlled Voltage Source Inverter-fed Induction Motor Drive employing a Refined Genetic Algorithm Controller (RGAC) to encounter the above problems and to devise a more effective method of speed control. Finally, the simulation results of Conventional DTC and RGAC-DTC drive are compared. It is observed that the torque and flux ripples are less in the proposed scheme and offers improved dynamic response.

Keywords: Direct Torque Control (DTC), Refined Genetic Algorithm Controller (RGAC), Induction Motor Drive (IMD), Torque ripples, Flux ripples, Current ripples, Voltage Source Inverter (VSI)