Experimental Case Studies on Dead-Time Induced Oscillation and its Mitigation in 5-HP and 10-HP Induction Motor Drives

Guha, Anirudh and Chetty, Abhishek and Panda, Ekta K and Kumaresan, C and Narayanan, G and Krishnanworthy, R (2016) Experimental Case Studies on Dead-Time Induced Oscillation and its Mitigation in 5-HP and 10-HP Induction Motor Drives. In: 3rd International Conference on Electrical Energy Systems (ICEES), MAR 17-19, 2016, Chennai, INDIA, pp. 23-28.

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Abstract

Inverter dead-time, which is meant for safe commutation of devices is known to induce sub-harmonic oscillations in lightly-loaded induction motor drives operating in open-loop. This paper presents an experimental procedure to determine whether a given motor drive would exhibit such oscillations, and if yes, the region of such oscillatory behaviour. In particular, this paper presents case studies on oscillations on account of dead-time in inverter-fed 5-HP and 10-HP induction motor drives. Experimental measurements are made at different fundamental frequencies and different flux levels (or V/f ratios) to identify if the motor drive exhibits oscillatory behaviour at these various operating points. The regions of oscillatory behaviour of the two motors under no-load are identified experimentally in terms of applied voltage and modulating frequency. A simple dead-time compensation scheme is employed to mitigate these low-frequency oscillations. The experimental waveforms and corresponding Fast Fourier Transform (FFT) analysis of the motor currents demonstrate the sub-harmonic oscillations and their mitigation.

Item Type:	Conference Proceedings
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	20 Jan 2017 04:24
Last Modified:	20 Jan 2017 04:24
URI:	http://eprints.iisc.ac.in/id/eprint/55929

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