A Review on Direct Torque Control of Induction Motor

At present, induction motors are the dominant drives in various industries. It is quite cumbersome to control an induction motor (IM) because of its poor dynamic response in comparison to the DC motor drives. The central theme of Vector Control (VC) is to decouple the stator current of the IM into two orthogonal components and is to control these two components individually so as to achieve an independent control of flux and torque of the IM. VC is still very complex to implement. Direct Torque Control (DTC) is an improvised VC method. With the DTC scheme employing a Voltage Source Inverter, it is possible to control directly the stator flux linkage and the electromagnetic torque by the optimum selection of inverter switching vectors. The modeling of an IM drive employing DTC with application of fuzzy is performed in this article, it is better to understand the DTC and its difficulties. The reference voltage vector is then realized using a voltage vector modulator. Several variations of DTC-SVM have been proposed and discussed in the literature. The work of this review paper is to study, evaluate and compare the various techniques of the DTC-SVM applied to the Induction Motor.