A WIDE SPEED RANGE DIRECT TORQUE CONTROL OF INDUCTION MOTORS USING AN IMPROVED HYBRID STATOR FLUX ESTIMATOR SCHEME | ||||
ERJ. Engineering Research Journal | ||||
Article 3, Volume 28, Issue 3, July 2005, Page 227-237 PDF (478.54 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/erjm.2005.69953 | ||||
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Authors | ||||
Esam E. Wahdan1; M. M Khater2; A. Mobarka2; A.A. El-Hefnawy2 | ||||
1International Steel Rolling Mill (ISW), Al-Sadat City, Minoufiya, Egypt | ||||
2Department of Electrical Engineering, Faculty of Engineering, Minoufiya University, Shebin El-kom Egypt | ||||
Abstract | ||||
Direct torque control (DTC) of three phase induction motors allows a high dynamic performance to be obtained with a very simple control scheme. It is based on the stator flux orientation in which the stator flux is used as a main control variable. Therefore in DTC, determination of stator flux is always of first and primary concern. This paper investigates the stator flux estimation problem over the entire speed range. A hybrid stator flux estimator which combines the voltage model and current model with a PI controller is proposed. The proposed method does not depend on the angular speed and reduces the problems associated with pure integrators of voltage model at low speed. An improved stator resistance adaptation scheme is used to enhance the system performance. Thus, the drive system is capable of working from very low speed up to high speed and exhibits good dynamic and steady-state performances. The effectiveness of the proposed scheme is investigated, and good results have been achieved for both steady-state and dynamic operating conditions. | ||||
Keywords | ||||
Induction motor; Direct Torque Control (DTC); stator flux estimator:stator resistance adaptation | ||||
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