SIMULATION OF FUZZY BASED DIRECT TORQUE CONTROL OF INDUCTION MOTOR DRIVE

Abstract

The control and estimation of ac drives in general are considerably more complex than those of dc drives, and this complexity increases substantially if high performances are demanded In recent years, the application field of Direct Torque Control (DTC), a variation of vector control, of induction machines has greatly increased in the areas of the traction, paper and steel Industry, and so on. Direct Torque Control is one of the actively researched control schemes, which is based on the decoupled control of flux and torque providing a very quick and robust response with a simple control construction in ac drives. The main limitations of the conventional DTC are large torque and current ripples and variable switching frequency. These disadvantages can be overcome by using Fuzzy Space Vector Modulation (FSVM). Direct Torque Control of Induction Motor using Fuzzy based SVM has been adopted for the present study. The torque ripple and Flux error can be reduced by using Fuzzy based SVM as compared to classical DTC. In present work, these comparative features have been highlighted, through MATLAB simulation