Robust Nonlinear Control for Induction Motor Drives Based on Adaptive Disturbance Compensation

This paper proposes a new active disturbance rejection control (ADRC) for induction motor (IM) drives. In particular, it improved the classic ADRC based on Extended State Observer (ESO), adopting, in its place, a high-gain Unknown Input Observer (UIO) with a driving term that is a function of the tracking error. This approach allows total robustness versus inverter nonlinearity effects and voltage drops as well as versus wrong knowledge of the inertia of the system, as explained in the paper. The proposed control technique has been experimentally verified on a suitably devised test set-up. Finally, the proposed ADRC based on the UIO has been verified in both numerical simulation and experimentally with the classic fieldoriented control (FOC), the input-output feedback linearization (FLC), and an advanced ADRC based on ESO with a sliding mode (SM) action.