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Universal Control and Management Strategies for Micro-Grid-Based Smart Grids Using Synchronous Converters Open Access


Other title
smart grid
Smart grid, microgrid, control topology, management, nonlinear control, weak grid, self-synchronization
Type of item
Degree grantor
University of Alberta
Author or creator
Ashabani, Seyed Mahdi
Supervisor and department
Dr. Yasser Abdel-Rady Mohamed
Examining committee member and department
Dr. Yasser Mohamed (Dr. Yasser Mohamed), Dr. Yunwei Li (electrical and computer), Dr. Qing Zhao (electrical and computer),Dr. S. Ali Khajehoddin (electrical and computer)
Dr. Qing Zhao, department of electrical and computer engineering
Dr. Yasser Mohamed, department of electrical and computer engineering
Dr. Yunwei Li, department of electrical and computer engineering
Dr. S. Ali Khajehoddin, department of electrical and computer engineering
Department of Electrical and Computer Engineering
power engineering and power electronics
Date accepted
Graduation date
Doctor of Philosophy
Degree level
The energy sector is moving into the era of distributed generation (DG) and micro-grids (MGs). This research focuses on development of a new family of control and management strategies for integration of micro-grids with numerous voltage source converters and synchronous generators in smart power grids by introducing the new concepts of Synchronous Converters and Synchronous-VSC. The stability and operation aspects of converter-dominated MGs are faced by many challenges. Important among these are: 1) the absence of physical inertia; 2) power quality issues due to permanent frequency offset and voltage and current regulation; 3) mutual interactions among synchronous generators and voltage source converters; 4) transitions to islanding and its detection delays; 5) large sudden disturbances associated with grid restoration, transition to islanding and DG out-of-phase re-closing; and 6) development of high impedance weak MGs because of installation of renewable energy resources in areas which are geographically remote from the load centers. This dissertation presents a new family of comprehensive control and management strategies for MGs in smart distribution grids. The thesis also provides a general and computationally-efficient framework for the modeling and analysis of the management strategies in a multiple-DG MGs; the framework facilities MG dynamic studies and controller parameters in large micro-grids with multiple DG units. Three different approaches for real and reactive power management are proposed. The controllers offer the following advantages: 1) the proposed topologies can be applied to both voltage-controlled (VC) and current controlled (CC) voltage source converters (VSCs). 2) The controllers are universal and realize requirements of both grid-connected and islanded modes, i.e. share real and reactive power during islanding and act as grid supporting VSCs in grid connected mode. 3) The controller emulates the behaviour of conventional synchronous generators (SGs) which in turn results in better integration of electronically-interfaced DG units into the power system and prevents instabilities due to interaction of fast response DGs and SGs. 4) The controllers realize seamless and robust transition to islanding mode. 5) The controllers are equipped with a nonlinear supplementary controller to mitigate large power angle swings associated with large-signal disturbances. 6) The controllers can be easily adapted to conventional synchronous machines. 7) The controller provides seamless self-synchronization operation under out-of-phase reclosing. 8) The controllers provide stable operation and superior current decoupling in very weak grids and MGs.
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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