Investigation of SM DTC-SVM performances of IM control considering load disturbances effects

This work is developed within the objective to discard load disturbances effects on the induction machine drives under DTC-SVM control. The paper is devoted to the presentation of a comparison study between two DTC-SVM strategies applied to the speed control of an induction motor: (i) a DTC-SVM control using PI controllers and (ii) a DTC-SVM control using sliding mode controllers without and with gain load estimator. Firstly, mathematical fundamentals of both strategies are briefly formulated. Then, and considering a linear torque case, an adaptive load torque estimator is inserted in the speed loop in order to overcome the problem of load disturbance effects. Finally, simulation results dealing with steady-state as well as dynamic behaviors of the induction motor under both DTC-SVM strategies are presented and compared. Simulation results clearly show that SM DTC-SVM strategy with load estimator offers the best performances and the load disturbances effects can be completely discarded.