Small-Signal Stability Analysis of an Open-loop Induction Motor Drive Including the Effect of Inverter Dead-Time

Guha, Anirudh and Narayanan, G (2014) Small-Signal Stability Analysis of an Open-loop Induction Motor Drive Including the Effect of Inverter Dead-Time. In: IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2014, Dec 16-19, 2014, IIT Bombay.

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Abstract

This paper demonstrates light-load instability in open-loop induction motor drives on account of inverter dead-time. The dynamic equations of an inverter fed induction motor, incorporating the effect of dead-time, are considered. A procedure to derive the small-signal model of the motor, including the effect of inverter dead-time, is presented. Further, stability analysis is carried out on a 100-kW, 415V, 3-phase induction motor considering no-load. For voltage to frequency (i.e. V/f) ratios between 0.5 and 1 pu, the analysis brings out regions of instability on the V-f plane, in the frequency range between 5Hz and 20Hz. Simulation and experimental results show sub-harmonic oscillations in the motor current in this region, confirming instability as predicted by the analysis.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright for this article belongs to the IEEE, USA
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	13 Jan 2015 05:27
Last Modified:	13 Jan 2015 05:27
URI:	http://eprints.iisc.ac.in/id/eprint/50661

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