Suppression of lower order harmonics by Switched-Capacitive filtering using Polygonal Space Vector Structures and Capacitor Sizing for Induction Motor Drive Applications

Dewani, R and Gopakumar, K and Umanand, L and Bhattacharya, S (2021) Suppression of lower order harmonics by Switched-Capacitive filtering using Polygonal Space Vector Structures and Capacitor Sizing for Induction Motor Drive Applications. In: 47th Annual Conference of the IEEE Industrial Electronics Society, IECON 2021, 13-16 Oct 2021, Toronto.

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Abstract

The Induction Motor Drives based on polygonal voltage space vector structures proposed in literature make use of switched-capacitive filtering for the suppression of lower order harmonics in the motor phase voltage. The Open-End Induction Motor (OEIM) drive systems feed the Motor with a primary and secondary inverter from either end. The primary inverter is fed with an active DC link supply, that provides all the active power for motor operation. The harmonics in motor phase voltage generated by primary inverter, are suppressed by employing a secondary inverter fed with a capacitive supply. The superposition of primary and secondary vectors generate reference vectors, that lie on the tips of a regular polygon. This work explains explains the suppression of lower order harmonics by Polygonal Voltage Space Vector Structures, by proposing a method of visualizing the harmonics in the α-β plane. The cancellation of fifth and seventh order harmonics in the reference space vector for a 42-sided Voltage Space Vector Structure will be explained using the proposed method of visualizing the harmonics. The 5th and 7th order harmonics are canceled, as the reference vector spans a 60° duration. The suppression of said harmonics by secondary inverter, results in sixth harmonic reactive power in secondary inverter. A quantitative analysis is carried out for the design of capacitor feeding secondary inverter to maintain a small ripple in secondary inverter, while delivering sixth order power for suppression of harmonics. © 2021 IEEE.

Item Type:	Conference Paper
Publication:	IECON Proceedings (Industrial Electronics Conference)
Publisher:	IEEE Computer Society
Additional Information:	The copyright for this article belongs to IEEE Computer Society
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	13 Dec 2021 11:31
Last Modified:	13 Dec 2021 11:31
URI:	http://eprints.iisc.ac.in/id/eprint/70727

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