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

Milutin Petronijević, Nebojša Mitrović, Vojkan Kostić and Bojan Banković
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Milutin Petronijević: Faculty of Electronic Engineering, University of Niš, Niš 18000, Serbia
Nebojša Mitrović: Faculty of Electronic Engineering, University of Niš, Niš 18000, Serbia
Vojkan Kostić: Faculty of Electronic Engineering, University of Niš, Niš 18000, Serbia
Bojan Banković: Faculty of Electronic Engineering, University of Niš, Niš 18000, Serbia

Energies, 2017, vol. 10, issue 5, 1-16

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.

Keywords: voltage sag; power quality; direct torque control; induction motor; adjustable speed drives (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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