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Advances in Power Electronics
Volume 2012 (2012), Article ID 764038, 11 pages
http://dx.doi.org/10.1155/2012/764038
Research Article

Direct Torque Control Induction Motor Drive with Improved Flux Response

1Department of Electrical Engineering, University Institute of Technology, Rajiv Gandhi Technical University, Bhopal 462033, India
2Department of Electrical Engineering, Maulana Azad National Institute of Technology, Bhopal 462051, India
3Power Electronics R&D Design Center, Danfoss Power Electronics A/s Norager, 6B, 2Th, 6400 Sonderborg, Denmark

Received 9 May 2012; Revised 25 July 2012; Accepted 27 July 2012

Academic Editor: Don Mahinda Vilathgamuwa

Copyright © 2012 Bhoopendra Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Accurate flux estimation and control of stator flux by the flux control loop is the determining factor in effective implementation of DTC algorithm. In this paper a comparison of voltage-model-based flux estimation techniques for flux response improvement is carried out. The effectiveness of these methods is judged on the basis of Root Mean Square Flux Error (RMSFE), Total Harmonic Distortion (THD) of stator current, and dynamic flux response. The theoretical aspects of these methods are discussed and a comparative analysis is provided with emphasis on digital signal processor (DSP) based controller implementation. The effectiveness of the proposed flux estimation algorithm is investigated through simulation and experimentally validated on a test drive.