Abstract—The maximum value of the peak-phase voltage that can be obtained from a 3-Ph inverter with Sinusoidal Pulse Width Modulation (SPWM) technique is equal to 0.5Vdc It can be improved to 0.577Vdc by Space Vector Pulse Width Modulation (SVPWM). So that a better DC bus utilization compared to SPWM (by about 15.4%). With the Conventional Direct Torque Control 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. In this paper the modeling and simulation of induction motor drive employing SVM-DTC was carried out using MATLAB/SIMULINK simulation package and results are compared with Conventional DTC.

Index Terms—DTC, VSI, SVM

K. G. Krishna is with the EEE Department at Adam‟s Engineering College (Accredited by NBA), Paloncha.
T. K. Kumar is with the EEE Department at Avanthi Institute of Engineering and Technology, Hyderabad.
P. V. Rao is with the Department at SR Engineering College (Autonomous), Warangal, Andhra Pradesh.

Cite: K .Gopala Krishna, T. Kranthi Kumar, and P. Venugopal Rao, "Better DC Bus Utilization and Torque Ripple Reduction by using SVPWM for VSI fed Induction Motor Drive," International Journal of Computer and Electrical Engineering vol. 4, no. 2, pp. 202-206, 2012.