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Tradeoffs between AC power quality and DC bus ripple for 3-phase 3-wire inverter-connected devices within microgrids

Roscoe, Andrew and Finney, Stephen and Burt, Graeme (2011) Tradeoffs between AC power quality and DC bus ripple for 3-phase 3-wire inverter-connected devices within microgrids. IEEE Transactions on Power Electronics, 26 (3). pp. 674-688. ISSN 0885-8993

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Abstract

Visions of future power systems contain high penetrations of inverters which are used to convert power from dc (direct current) to ac (alternating current) or vice versa. The behavior of these devices is dependent upon the choice and implementation of the control algorithms. In particular, there is a tradeoff between dc bus ripple and ac power quality. This study examines the tradeoffs. Four control modes are examined. Mathematical derivations are used to predict the key implications of each control mode. Then, an inverter is studied both in simulation and in hardware at the 10 kVA scale, in different microgrid environments of grid impedance and power quality. It is found that voltage-drive mode provides the best ac power quality, but at the expense of high dc bus ripple. Sinusoidal current generation and dual-sequence controllers provide relatively low dc bus ripple and relatively small effects on power quality. High-bandwidth dc bus ripple minimization mode works well in environments of low grid impedance, but is highly unsuitable within higher impedance microgrid environments and/or at low switching frequencies. The findings also suggest that the certification procedures given by G5/4, P29 and IEEE 1547 are potentially not adequate to cover all applications and scenarios.

Item type: Article
ID code: 32354
Notes: This is a significant piece of work in a journal of high quality, analysing the differences between 4 different inverter control algorithms, backed up with significant laboratory experiments. Originally targetted for a special call, this article appeared later due to long waits for reviews.
Keywords: harmonic analysis, inverters, voltage control , voltage measurement, power convertors, Electrical engineering. Electronics Nuclear engineering, Electrical and Electronic Engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Depositing user: Pure Administrator
Date Deposited: 01 Aug 2011 09:06
Last modified: 16 Apr 2015 08:12
URI: http://strathprints.strath.ac.uk/id/eprint/32354

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