Deadbeat Direct Torque Control of Induction Motor Based on MRAS

For the traditional direct torque control of induction motor, the ripple of flux linkage and torque is serious, and the inverter switching frequency is not constant. This paper proposes a deadbeat direct torque control strategy of induction motor. The control algorithm of speed identification based on model reference adaptive system is analyzed. By using back electromotive force as the error vectors estimators, the mathematical model of speed identification scheme is built. The simulation results indicate that the proposed control strategy can not only weaken flux linkage and torque ripple, but also remain the advantage of rapid dynamic response of the direct torque control.