Low order harmonic cancellation in a grid connected multiple inverter system via current control parameter randomization

Armstrong, M., Atkinson, D.J., Johnson, C.M. and Abeyasekera, T.D. (2005) Low order harmonic cancellation in a grid connected multiple inverter system via current control parameter randomization. IEEE Transactions on Power Electronics, 20 (4). pp. 885-892. ISSN 0885-8993

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Abstract

In grid connected multiple inverter systems, it is normal to synchronize the output current of each inverter to the common network voltage. Any current controller deficiencies, which result in low order harmonics, are also synchronized to the common network voltage. As a result the harmonics produced by individual converters show a high degree of correlation and tend to be additive. Each controller can be tuned to achieve a different harmonic profile so that harmonic cancellation can take place in the overall system, thus reducing the net current total harmonic distortion level. However, inter-inverter communication is required. This paper presents experimental results demonstrating an alternative approach, which is to arrange for the tuning within each inverter to be adjusted automatically with a random component. This results in a harmonic output spectrum that varies with time, but is uncorrelated with the harmonic spectrum of any other inverter in the system. The net harmonics from all the inverters undergo a degree of cancellation and the overall system yields a net improvement in power 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:	low order harmonics, multiple inverter systems, net harmonics
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User:	Sherpa Assistant
Date Deposited:	12 Dec 2005
Last Modified:	08 Feb 2013 16:48
Published Version:	http://dx.doi.org/10.1109/TPEL.2005.850949
Status:	Published
Refereed:	Yes
Identification Number:	10.1109/TPEL.2005.850949
URI:	http://eprints.whiterose.ac.uk/id/eprint/855

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