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Energies 2017, 10(5), 663; doi:10.3390/en10050663

An Improved Scheme for Voltage Sag Override in Direct Torque Controlled Induction Motor Drives

Faculty of Electronic Engineering, University of Niš, Niš 18000, Serbia
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Author to whom correspondence should be addressed.
Academic Editor: Jose Fernando Alves da Silva
Received: 12 March 2017 / Revised: 3 May 2017 / Accepted: 4 May 2017 / Published: 10 May 2017
(This article belongs to the Special Issue Power Electronics in Power Quality)
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Abstract

This paper analyses symmetrical and unsymmetrical voltage sag effects on the torque and speed deviation in direct torque controlled (DTC) induction motors (IMs) for adjustable speed drives (ASDs). The capability of an ASD for continuous normal operation in case of short supply disturbances is essential for high performance drives. In this paper, an updated scheme is proposed for boosting ASD performances during supply disturbances with voltage reduction. Flux weakening is an effective method to overcome the torque-decreasing problem in case of DC-link voltage diminishing. It is also shown that speed reduction is an efficient procedure to obtain the voltage sag insensitivity of an ASD, which is appropriate for the existing industrial applications. Extensive laboratory testing has been conducted to verify the performances and effectiveness of the proposed control algorithm. The suggested method requires only a modification of converter control software or operating speed change without any additional hardware components. Extended tests under various voltage sags events were carried out on a 1.5 kW laboratory drive, and the obtained results have been compared with an industrial DTC drive. View Full-Text
Keywords: voltage sag; power quality; direct torque control; induction motor; adjustable speed drives voltage sag; power quality; direct torque control; induction motor; adjustable speed drives
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MDPI and ACS Style

Petronijević, M.; Mitrović, N.; Kostić, V.; Banković, B. An Improved Scheme for Voltage Sag Override in Direct Torque Controlled Induction Motor Drives. Energies 2017, 10, 663.

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