VSC-based DTC-SVM with adaptive parameter estimation

This paper describes a robust sliding mode control with parameter adaptive estimation for a DTC-SVM system. The proposal combines advantages and benefits of both (i) DTC-SVM approach, which produces constant switching frequency, and overcomes several problems of induction machine control, and (ii) variable-structure controllers (VSC) which offer fast dynamic response, and which are easy to implement. Proposed variable structure controllers are designed to provide fast and accurate torque and flux controls which replace traditional hysteresis comparators. A new adaptive parameter estimation scheme is described. The synthesis of such controllers and parameter estimators is done using the Lyapunov stability theory. Simulation results dealing with steady-state as well as dynamic behaviors of the controlled induction motor show the efficiency and the robustness of the designed controllers and estimators.