Torque Ripple minimization techniques in direct torque control induction motor drive

This paper considers direct torque control strategies in induction motor drive to minimize torque ripples. Spacevector modulation and modified space vector control concept is implemented to design the controller. Basic DTC method suffers from torque ripples problem and switching frequency variation.[1] Torque ripples are minimized using space vector modulation technique but execution time in three phases to two phase transformation and reference voltage calculations requires more, comparing with other method by determination of effective time vectors. Sector and angle determination and procedure of determination of reference vector is eliminated in modified Space vector modulation method. Simulation studies have been carried out for three methods.Basic DTC results in, change in flux, change in speed and change in load are simulated in Matlab and compared with other two strategies on the same platform.This paper mainlyhighlights performance of the drive in dynamic torque and flux response. Keywords—Basic DTC;SVPWM;torque ripple