Title: Modified stator flux estimation-based direct torque controlled induction motor drive with constant switching frequency operation

Authors: Abhijit Choudhury; Kishore Chatterjee

Addresses: Department of Electrical Engineering, Indian Institute of Technology, Powai, Bombay, 400076, India ' Department of Electrical Engineering, Indian Institute of Technology, Powai, Bombay, 400076, India

Abstract: A space vector pulse width modulated (SV-PWM) direct torque controlled (DTC) induction motor drive, having reduced torque ripple even at low operating speeds and maintaining constant switching frequency has been studied and implemented with a modified stator flux estimation scheme. It utilises a compensator for the phase and magnitude error introduced by low pass filter, which is being used to avoid DC drift, problem of saturation and to enhance the transient response of the machine. Detailed simulation studies are carried out to verify the efficacy of the system. The viability of the scheme is confirmed by performing detailed experimental studies.

Keywords: induction motor drives; direct torque control; DTC; space vector pulse width modulated; SV-PWM; fixed switching frequency; modified stator flux estimator; induction motor; constant switching frequency; simulation; DC drift; saturation; transient response.

DOI: 10.1504/IJPELEC.2012.052430

International Journal of Power Electronics, 2012 Vol.4 No.6, pp.566 - 579

Accepted: 02 Dec 2012
Published online: 23 Aug 2014 *

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