Using Space Vector Modulation in a DTC Scheme


Direct torque control (DTC) is known to produce quick and robust response in AC drives. However, during steady state, torque, flux and current ripple occur. An improvement of the electric drive can be obtained using a DTC scheme based on the space vector modulation (SVM) which reduces the torque and flux ripple. The proposed control scheme considers the rotor resistance variation. This paper also discusses the application of artificial neural network (ANN) as a speed estimator. The capability and precision of this scheme as a speed estimator is validated by simulation results, from which it is concluded that the proposed control scheme produces better results than the classical DTC.

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