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Suppression of line voltage related distortion in current controlled grid connected inverters

Abeyasekera, T., Johnson, C.M., Atkinson, D.J. and Armstrong, M. (2005) Suppression of line voltage related distortion in current controlled grid connected inverters. IEEE Transactions on Power Electronics, 20 (6). pp. 1393-1401. ISSN 0885-8993

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Abstract

The influence of selected control strategies on the level of low-order current harmonic distortion generated by an inverter connected to a distorted grid is investigated through a combination of theoretical and experimental studies. A detailed theoretical analysis, based on the concept of harmonic impedance, establishes the suitability of inductor current feedback versus output current feedback with respect to inverter power quality. Experimental results, obtained from a purpose-built 500-W, three-level, half-bridge inverter with an L-C-L output filter, verify the efficacy of inductor current as the feedback variable, yielding an output current total harmonic distortion (THD) some 29% lower than that achieved using output current feedback. A feed-forward grid voltage disturbance rejection scheme is proposed as a means to further reduce the level of low-order current harmonic distortion. Results obtained from an inverter with inductor current feedback and optimized feed-forward disturbance rejection show a THD of just 3% at full-load, representing an improvement of some 53% on the same inverter with output current feedback and no feed-forward compensation. Significant improvements in THD were also achieved across the entire load range. It is concluded that the use of inductor current feedback and feed-forward voltage disturbance rejection represent cost–effect mechanisms for achieving improved output current quality.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: feed-forward voltage disturbance rejection, total harmonic distortion (THD)
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User: Repository Officer
Date Deposited: 12 Dec 2005
Last Modified: 10 Jun 2014 01:04
Published Version: http://dx.doi.org/10.1109/TPEL.2005.857557
Status: Published
Refereed: Yes
Identification Number: 10.1109/TPEL.2005.857557
URI: http://eprints.whiterose.ac.uk/id/eprint/877

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