Robust GPI Controller for trajectory tracking for induction Motors

In this article, we propose a field oriented control scheme of two stages. The first stage keeps the tracking of the angular velocity and simultaneously, regulates the flux modulus by means of the stator currents. These designed current signals are used as reference trajectories for the second stage. Both stages use observer based controllers of Generalized Proportional Integral (GPI) nature. The trajectory tracking task is defined on the angular velocity of a complete model of an induction motor subject to a completely unknown, but bounded, load torque perturbation input. The robustness is tested under deviation of system parameter, additive unknown perturbations and high frequency measurement noises in the closed loop system. A numerical simulation verifies the effectiveness of the proposed scheme.