Influence of parameters identification errors on the stability boundaries of the modified MRASCC speed estimator of the induction motor drive

In this paper the induction motor state estimator based on current MRAS-type concept with a modified speed adaptation algorithm is presented. Its stability in motoring and regenerating modes is analysed. The influence of motor parameter mismatch to the stability boundaries is presented. It is shown that one of the proposed modification methods of the adaptation algorithm makes the estimator stable under regenerating mode even under the motor parameters changes.