Impact of Undercompensation and Overcompensation of Dead-Time Effect on Small-Signal Stability of Induction Motor Drive

Guha, Anirudh and Narayanan, G (2018) Impact of Undercompensation and Overcompensation of Dead-Time Effect on Small-Signal Stability of Induction Motor Drive. In: IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, 54 (6). pp. 6027-6041.

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Abstract

Inverter dead-time is known to make open-loop induction motor drives oscillatory, while operating at light-loads in particular. While dead-time compensation schemes exist, precise compensation of the same is often challenging as it involves factors such as device and driver delays and switching transition times, which are difficult to be quantified accurately. Hence, the effect of dead-time could be under or overcompensated. This paper presents a comprehensive analysis of the impact of such undercompensation and overcompensation on the stability of a 100-kW induction motor drive, along with experimental investigations of the same. The effects of undercompensation and overcompensation on the inverter output voltage are analyzed on a switching-cycle average basis. Further, small-signal models are proposed for an open-loop drive, when it is undercompensated and overcompensated. Stability analysis of the above motor drive is reported, which predicts oscillatory behavior with both under and overcompensation, over certain fundamental frequency ranges, respectively. Further, two different types of oscillatory behavior, characterized by different oscillating frequencies, are observed for the cases of under and overcompensation. The analyses are supported by simulations. Experimental investigations carried out also support the analyses and simulation results.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copy right for this article belong to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords:	Dead-time compensation; induction motor; inverter dead-time; pulsewidth-modulated inverters; small-signal model; stability; variable speed drive
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	28 Nov 2018 15:13
Last Modified:	28 Nov 2018 15:13
URI:	http://eprints.iisc.ac.in/id/eprint/61176

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