Robust Indirect Vector Control For The Induction Machine

In the present work, the motion control for the induction machine by indirect field oriented methods is addressed. The computation of the slip frequency which is traditionally done by a feedforward control structure is substituted by a feedback loop. The introduction of the slip frequency in the control loop generates a non-linear model which is also uncertain and non-stationary. Despite the complexity of the model, a simple robust integral control method guarantees the stability of the system all over the operating range of the plant. In order to complete the robustness of the method to parameter variations, a new determination of the stator current references is proposed based on the electromagnetic torque estimation.31232123