A Mixed MRAC for Adaptation of Rotor Time Constant of Induction Motor based on the Parameter Sensitivity Analysis

摘要

In the procedure of adaptation for rotor time constant of induction motor with Model Reference Adaptive Controller (MRAC), a mismatch of the parameter between model and motor has strong influence on the adaptation result and therefore degrade the control performance. In the study, the analytical solution between model error signals and detuned parameters are deduced, the parameter sensitivity of both d-axis voltage and reactive power-based MRAC are then analyzed theoretically and validate by a large amount of simulations, where d-axis voltage based model shows low sensitivity to mutual inductance but high to stator resistance while reactive power model just the opposite. To take full advantage of each model, a combination is then developed to construct a new MRAC. By adjusting the weighting factor for model error signals in different speed, torque region, the robustness and stability range to detuned parameters are improved and simulation followed validates the feasibility and effectiveness of the method proposed.