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Power electronics, Distributed power generation, Power quality


Supervisor and department: Li, Yunwei Electrical and Computer Engineering

Examining committee member and department: Salmon, John Electrical and Computer Engineering Li, Yunwei Electrical and Computer Engineering Abdel-Rady I.Mohamed, Yasser Electrical and Computer Engineering Xu, Wilsun Electrical and Computer Engineering Barlage, Douglas Electrical and Computer Engineering

Department: Department of Electrical and Computer Engineering

Specialization: Power Engineering and Power Electronics

Date accepted: 2013-12-04T13:30:02Z

Graduation date: 2014-06

Degree: Doctor of Philosophy

Degree level: Doctoral

Abstract: A large number of renewable energy resources have been installed in the power distribution system in the form of distribution generation. To interconnect renewable energy resources to the utility power system, the power electronics converter is often used as an efficient interface of distributed generation units. However, the presence of power converters with high order LC or LCL filters also introduces many harmonic and resonance problems to power distribution systems. In addition, the growing application of distributed nonlinear loads further aggravates the harmonic distortions in the power distribution system.To solve these problems, this thesis discusses interfacing converter control method that actively mitigates the resonances and harmonics in power distribution systems. The first objective is to provide sufficient damping effect to distributed generation unit interfacing converter filters through improved inverter control. To realize this objective, this thesis conducts an in-depth investigation on resonances in both a single inverter and multiple parallel inverters. The virtual impedance based damping method is proposed to realize better control of interfacing converters. The second objective of this thesis is to compensate the impact of nonlinear loads in the low voltage distribution system through flexible operation of interfacing converters. In the scenario, the interfacing converter essentially works as a virtual harmonic filter. A number of power distribution system harmonic compensation methods are proposed. They aim to realize better power quality of future power electronics intensive power distribution systems.

Language: English

DOI: doi:10.7939-R3Z02ZG43

Rights: Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.


Fuente: https://era.library.ualberta.ca/


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