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Damping and Harmonic Control of DG Interfacing Power Converters Open Access


Other title
Power electronics
Distributed power generation
Power quality
Type of item
Degree grantor
University of Alberta
Author or creator
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 of Electrical and Computer Engineering
Power Engineering and Power Electronics
Date accepted
Graduation date
Doctor of Philosophy
Degree level
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.
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.
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