Research articleNonlinear SVM-DTC for induction motor drive using input-output feedback linearization and high order sliding mode control

- Improvement of direct torque control for induction motor drive.
- High torque and flux ripples reducing using the space vector modulation.
- Design of nonlinear robust control for flux, torque and speed loops.
- Estimation of the applied load torque using second order sliding mode observer.
- Hardware implementation of the proposed control strategy using dSpace 1104 interface.

This paper presents a nonlinear Direct Torque Control (DTC) strategy with Space Vector Modulation (SVM) for an induction motor. A nonlinear input-output feedback linearization (IOFL) is implemented to achieve a decoupled torque and flux control and the SVM is employed to reduce high torque and flux ripples. Furthermore, the control scheme performance is improved by inserting a super twisting speed controller in the outer loop and a load torque observer to enhance the speed regulation. The combining of dual nonlinear strategies ensures a good dynamic and robustness against parameters variation and disturbance. The system stability has been analyzed using Lyapunov stability theory. The effectiveness of the control algorithm is investigated by simulation and experimental validation using Matlab/Simulink software with real-time interface based on dSpace 1104.