Reduction of torque ripple of VSI-fed induction machine controlled by direct torque control method

A reduced structure of deatbeat direct torque control based on space vector modulation (SVM-DTC) was proposed in this paper, the main ideal of Which is choosing the reference voltage vector in two phase stator reference frame previously and real-time calculating the pulse width of the reference voltage vector which diminish the error of torque. The improved structure need not have to solve a quadratic equation. It has a higher dynamic response ability and greatly improve the switch frequency and adjusting the torque more accurately in comparison with the classical DTC. The implementation of the control scheme using double DSP-based hardware is described, with complete experimental insults given.