Abstract
Direct torque control(DTC) scheme is one of the simplest and efficient vector control method. This paper aims to carry out a comparative study of two control methods of DTC. One is conventional DTC scheme based on hysteresis controllers and lookup table. Other method relies on space vector modulation(SVM) algorithm. Lookup table DTC method suffers from high ripples in torque, flux and current as well as varying switching frequency. On the other hand, SVM based DTC produces comparably low torque, flux and current ripples and switching frequency is maintained constant. Simulation of both DTC schemes is carried using MATLAB/Simulink software and the ripple content is estimated.
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