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Protection and Power Quality Impact of Distributed Generation on Distribution System Open Access


Other title
Harmonics of Wind Farms
Distributed Generation
Overcurrent Protection
Type of item
Degree grantor
University of Alberta
Author or creator
Yazdanpanahi, Hesam
Supervisor and department
Li, Yunwei
Xu, Wilsun
Examining committee member and department
Li, Yunwei (Electircal and Computer Engineering)
Mohammed, Yasser (Electircal and Computer Engineering)
Xu, Wilsun (Electircal and Computer Engineering)
Liu, Xian ((Electircal and Computer Engineering, University of Arkansas at Little Rock)
Zhao, Qing (Electircal and Computer Engineering)
Department of Electrical and Computer Engineering
Power Engineering and Power Electronics
Date accepted
Graduation date
Doctor of Philosophy
Degree level
Distributed Generation (DG) units are relatively small generation plants directly connected to the distribution networks as alternatives for bulky power plants and to integrate renewable energy sources into the power system. Despite their several advantages, DGs have a serious impact on the distribution system. In this thesis, the main focus is on the DGs’ impact on the Over-Current (O.C.) protection system’s coordination and also on the power quality. DGs are known to contribute fault currents to their interconnected power system. As a result, DGs may affect the coordination of O.C. protection in a distribution system. This problem is expected to become more acute as industry is moving towards requiring DGs to stay connected during faults (i.e., requiring low voltage ride through capability). This thesis presents its findings on the contributions of DGs to fault currents and their probable impact on the O.C. protection coordination. This thesis also presents techniques to mitigate the impact of Inverter-Based DGs (IBDGs) and Synchronous Machine DGs (SMDGs), as their impact on the O.C. protection, especially for marginal coordination, is more significant than that of other types of DG. In the discussion of the DG’s impact on the power quality, the main focus is on the harmonic modelling and analysis of Duobly-Fed Induction Generator (DFIG)-based wind farms. An accurate modeling method is proposed in this thesis. Also, the harmonic emissions of these DGs are compared to the limits determined by power quality standards. The findings show that the harmonic emissions of DFIG-based wind farms are too low to concern utility operators.
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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