Improved flux estimation and stator-resistance adaptation scheme for sensorless control of induction motor

Bhattacharya, T and Umanand, L (2006) Improved flux estimation and stator-resistance adaptation scheme for sensorless control of induction motor. In: IEE Proceedings Electric Power Applications, 153 (6). pp. 911-920.

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Abstract

The speed-sensorless vector-controlled induction-motor drive is superior to the conventional vector-controlled induction-motor drive in terms of drive cost and reliability. In speed-sensorless control, one common practice is to estimate the flux position from the terminal voltage and current using a stator-voltage model. The accuracy of estimated flux position decides the performance of the vector-controlled drive. However, the performance is limited by the DC-drift problems that prohibit the use of open integration of the flux-producing voltage component for flux estimation. The paper proposes a flux-estimation method that gives the effect of open integration along with an inherent error-decaying mechanism to resolve the DC-drift problem. A stator-resistance-adaptation method is also incorporated in the flux estimator, which makes the flux-position estimation independent of resistive parameters of the motor. Using this flux estimation algorithm, a rotor-flux-oriented speed-sensorless speed-control scheme of induction motor is proposed. The scheme is both simulated and experimentally verified.

Item Type:	Journal Article
Publication:	IEE Proceedings Electric Power Applications
Publisher:	IEE
Additional Information:	Copyright of this article belongs to Institution of Engineering and Technology (IET).
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	22 Feb 2007
Last Modified:	19 Sep 2010 04:34
URI:	http://eprints.iisc.ac.in/id/eprint/9380

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