Stabilization of regenerating mode at low speeds for adaptive speed sensorless induction motor drives

• Published in: Journal of the Chinese Institute of Engineers Vol. 33; no. 2; pp. 229 - 242
• Main Authors: Pu, Wen-Cheng, Liu, Chang-Huan
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.03.2010
• Subjects: induction motor; regenerating mode; sensorless vector control; stability
• ISSN: 0253-3839; 2158-7299
• DOI: 10.1080/02533839.2010.9671613

A stator-flux-oriented adaptive speed-sensorless vector control method for an induction motor drive is proposed, which specifically addresses the stabilization issue during the regenerating mode at low speeds. The nonlinear motor and full-order flux observer models are linearized according to a chosen steady-state operation point. It is shown that the stability of the drive during the regeneration mode is related to both the observer's feedback gains and the speed estimator's controller parameters. The operating range of the gains is derived to ensure the stable operation of the drive. To further enhance the drive control performance, an on-line stator resistance estimation algorithm is proposed and incorporated into the control laws. Experiments confirm that the proposed method can stabilize the drive system during the regeneration mode at low speeds and tracks the actual stator resistance in real-time.