Universiti Teknologi Malaysia Institutional Repository

An improved stator flux estimation in steady-state operation for direct torque control of induction machines

Idris, N. R. N. and Yatim, A. H. M. (2002) An improved stator flux estimation in steady-state operation for direct torque control of induction machines. IEEE Transactions on, Industry Applications, 38 (1). 110 -116. ISSN 0093-9994

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Abstract

This paper presents an improved stator flux estimation technique based on a voltage model with some form of low-pass (LP) filtering. In voltage-model-based stator flux estimation, an LP filter is normally used instead of a pure integrator to avoid integration drift problem due to DC offset, noise, or measurement error present in the back electromotive force. In steady-state condition, the LP filter estimator will degrade the performance and efficiency of the direct torque control (DTC) drive system since it introduced magnitude and phase errors, thus resulting in an incorrect voltage vector selection. The stator flux steady-state error between the LP filter and a pure integrator estimator technique is derived and its effect on the steady-state DTC drive performance is analyzed. A simple method is proposed to compensate for this error which results in a significant improvement in the steady-state drive performance. Simulation based on this technique is given and it is verified by experimental results

Item Type:Article
Uncontrolled Keywords:0.25 hp back electromotive force direct torque control error compensation low-pass filtering stator flux stator flux estimation stator flux steady-state error steady-state DTC drive performance steady-state condition torque ripple voltage model voltage-model-based stator flux estimation
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:1889
Deposited By: Dr Zaharuddin Mohamed
Deposited On:16 Mar 2007 07:24
Last Modified:01 Jun 2010 02:59

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