Research on direct torque control of induction machine based on the combination of the torque error prediction and SVPWM

Abstract：In order to reduce the large torque ripple of induction machine subjected to conventional direct torque control (DTC) at low speeds, a new control strategy of DTC was proposed.On the basis of conventional DTC, the reasons for torque ripple at low speeds were analyzed.The control strategy was introduced for the idea combination of the torque error prediction and SVPWM to reduce the torque ripples.The operational time of the non-zero voltage vector and zero voltage vector in the next control period was determined based on the predicted torque error, and the operational times of zero voltage vector will be reduced.Simulation results show that the torque can quickly converge the setting value through the method.It is stable and dynamic performance is good in the system.

Keyword：torque error prediction;direct torque control (DTC) ;torque ripple;SVPWM