Abstract
Because of their advantages, speed sensorless induction motor drives have received a lot of attention in the academic and industrial communities over the last decade. Despite the recent developments in this area, the performance of sensorless variable-speed IM drives in ultra-low and zero electrical rotor speeds and regeneration mode remains a big challenge. To obtain acceptable results under unobservable conditions, an adaptive high gain observer-based MRAS speed estimator is proposed in this paper. The stability analysis of the proposed algorithm is proved using the Lyapunov stability theorem. Moreover, the efficiency and feasibility of the proposed estimator are verified by comparative experiments.
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