Torque Ripple reduction by using Space Vector Pulse Width Modulation for VSI fed Induction Motor Drive

K .Gopala Krishna (1)  and P. Venugopal Rao (2)

Assistant Professor-EEE, Adam's Engeneering College, Paloncha, Khammam - 507 115, A.P., India. Email:
Head of the Department, EEE, SR Engineering College, Warangal-506371, A.P., India. Email:


Abstract: With the Conventional DTC scheme employing a Voltage Source Inverter (VSI), it is possible to control directly the stator flux linkage and the electromagnetic torque by the optimum selection of inverter switching vectors. The selection of inverter switching vector is made to restrict the flux and torque errors within the respective flux and torque hysteresis bands. However, DTC drives utilizing hysteresis comparators suffer from high torque ripple and variable switching frequency. The most common solution to this problem is to use the Space Vector Modulation. This achieves lower switching losses, better DC bus utilization, lower torque ripple, constant switching frequency, lower total harmonic distortion in the motor current. In this paper the modeling & simulation of induction motor drive employing DTC, SVM-DTC was carried out using MATLAB/SIMULINK simulation package and results are compared.

Key words: DTC, VSI, SVM-DTC.



International eJournal of Mathematics and Engineering

Volume 2, Issue 2, Pages:  955 - 966