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Modeling, Analysis, and Stabilization of a Single-Stage Utility-Scale Photovoltaic System with Reduced DC-Link Capacitance
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- Author / Creator
- Magableh, Mohammad Adnan
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A single-stage utility-scale photovoltaic (PV) system is usually interfaced with the host grid via a central voltage-source converter (VSC). Recently, due to their reliability, dc-link film capacitors are favored over electrolytic capacitors in grid-connected VSC applications. However, the capacitance per unit volume of film capacitors is significantly smaller than that of electrolytic capacitors. The overall system stability might be compromised by the reduction of the dc-link capacitance, particularly in PV systems, which have a dynamic resistance that varies with operating conditions. Using a detailed small-signal model of the grid-connected PV system, it is shown in this thesis that the reduction of the dc-link capacitance interferes with the dynamic resistance of the PV array leading to instabilities. The minimum dc-link capacitance that preserves the overall system stability is determined. To mitigate instabilities with a reduced dc-link capacitance, a simple yet effective active compensator is developed. Detailed time-domain simulations validate the analytical results and show the effectiveness of the proposed compensator in preserving the system stability.
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- Subjects / Keywords
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- Graduation date
- Fall 2020
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- 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.