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Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids Open Access


Other title
Constant Power
Type of item
Degree grantor
University of Alberta
Author or creator
Radwan, Amr A A
Supervisor and department
Mohamed, Yasser A.-R. I.
Examining committee member and department
Koch, Bob (Mechanical Engineering)
Mohamed, Yasser A.-R. I. (Electrical and Computer Engineering)
Xu, Wilson (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Power Engineering and Power Electronics
Date accepted
Graduation date
Master of Science
Degree level
The energy sector is moving towards extensive use of power electronic (PE) converters to interface distributed generation (DG) units and modern converter-interfaced loads (CILs). Therefore, the conventional distribution-grid is gradually transformed into a multi-stage PE converter-dominated network. However, interaction dynamics among equivalent source and load converters may adversely influence the overall stability even if each converter stage is inherently functional and stable. In multi-cascaded PE stages, the equivalent load/source admittance ratio should satisfy the Nyquist stability criterion to ensure stable operation. Moreover, tightly-regulated PE converters induce negative input admittance in the small-signal sense, which reduces overall stability margins. This thesis addresses interaction dynamics in emerging PE distribution systems by using small-signal linearization to derive equivalent input/output admittance models of typical PE converters. Active compensators are designed to maintain the system stability. Theoretical analysis and extensive simulation results are presented to validate the developed models and the proposed active compensators.
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.
Citation for previous publication
A. A. A. Radwan and Y. A.-R. I. Mohamed, “Linear active stabilization of converter-dominated dc micro-grids,” IEEE Transactions on Smart Grids, in press [Available Online, Digital Object Identifier: 10.1109/TSG.2011.2162430].

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