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Permanent link (DOI): https://doi.org/10.7939/R36H4CZ7W

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Modeling, Analysis and Control of Single and Multiple Micro-grid-Based Active Distribution Grids Open Access

Descriptions

Other title
Subject/Keyword
Micro-grid
Active synchronization
Flexible DG Interface
Networked control
Active distribution system
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Kahrobaeian, Alireza
Supervisor and department
Mohamed, Yasser (Electrical and Computer Engineering)
Examining committee member and department
Mohamed, Yasser (Electrical and Computer Engineering)
Liu, Jinfeng (Chemical and Materials Engineering)
Tavakoli, Mahdi (Electrical and Computer Engineering)
Iravani, Reza (Electrical and Computer Engineering)
Dinavahi, Venkata (Electrical and Computer Engineering)
Department
Department of Electrical and Computer Engineering
Specialization
Energy Systems
Date accepted
2014-05-22T09:44:27Z
Graduation date
2014-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Derived by economic, technical and environmental reasons, the energy sector is moving towards a new era of “Smart Active Distribution Systems” where clusters of converter-based distributed generation (DG) units, local loads and other filtering devices form micro-grids (MG), which can be regarded as the building blocks of future active distribution grids. However, several undesirable interaction dynamics could occur between the DG converters, which are usually equipped with high-order LC or LCL filters and system components such as power-factor correction capacitors, static and dynamic loads. Moreover, the lack of coordination between DG entities in single and multiple micro-grid systems results in inaccurate power sharing, frequency deviation and system instabilities. To solve these problems, this thesis provides detailed modeling, analysis and control of micro-grid systems with compromised voltage or power stability issues due to system uncertainties in presence of different types of loads, electronic devices or line parameter variation. Several robust converter-level control interfaces are proposed to mitigate such stability challenges in both voltage-controlled and current-controlled converters. Furthermore, accurate power sharing and coordinated control of multiple micro-grids is achieved by developing a new system-level hierarchical distributed networked-based control strategy which can provide active synchronization and power-tie regulation between multiple micro-grid entities in large active distribution systems. Simulation and experimental results validate the effectiveness of the proposed control schemes.
Language
English
DOI
doi:10.7939/R36H4CZ7W
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.
Citation for previous publication
A. Kahrobaeian, and Y. A.-R. I. Mohamed, “Interactive Distributed Generation Interface for Flexible MG Operation in Smart Distribution Systems”, IEEE Trans. on Sustainable Energy, vol. 3, no. 2, pp. 295-305, April 2012.A. Kahrobaeian, and Y. A.-R. I. Mohamed, “Suppression of Interaction Dynamics in Distributed Generation MGs Via Robust System-oriented Control Approach”, IEEE Trans. on Smart Grids, vol. 3 no. 4, pp. 1800-1811, December 2012.A. Kahrobaeian, and Y. A.-R. I. Mohamed, , “Direct Single-Loop μ-Synthesis Voltage Control for Suppression of Multiple Resonances in MGs with PFC Capacitors”, IEEE Trans. on Smart Grids, vol. 4 no. 2, pp. 1151-1161, June 2013.A. Kahrobaeian, and Y. A.-R. I. Mohamed, “Robust Single-Loop Direct Current Control of LCL-Filtered Converter-based DG Units in Grid-Connected and Autonomous MG Modes”, accepted in IEEE Trans. on Power Electronics, in press.A. Kahrobaeian, and Y. A.-R. I. Mohamed, “Analysis and Mitigation of Low-Frequency Instabilities in Autonomous Medium-Voltage Converter-Based MGs With Dynamic Loads”, IEEE Trans. on Industrial Electronics, vol.61, no.4, pp.1643,1658, April 2014.A. Kahrobaeian, and Y. A.-R. I. Mohamed, “Networked-based Hybrid Distributed Power sharing and Control for Islanded MG Systems”, IEEE Trans. on Power Electronics, in press.

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