A New Method for PI Parameter Adjustment of Induction Motor Based on MRAS

摘要

In speed sensorless vector control of induction motor (IM), speed estimation determines the performance of the system. Therefore, a PI parameters adjustment method of speed observer based on model reference adaptive system (MRAS) is proposed. Aiming at the problem of integral saturation and dc offset in voltage model flux observer (VM) using pure integrator, the method of high-pass filter with compensation is adopted. The transfer function of speed observer is deduced based on modern control theory. The stability of speed observer is analyzed and the PI parameters are designed according to the stability conditions, which avoids the complexity of empirical method and pole placement method, and has strong portability. The simulation results verified the feasibility and effectiveness of the design.