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Power management of power electronics interfaced low-voltage microgrid in islanding operation Open Access


Other title
Distributed generation of electric power
Electric controllers
Renewable energy sources
Interface circuits
Low voltage systems
Type of item
Degree grantor
University of Alberta
Author or creator
Li, Yan
Supervisor and department
Li, Yunwei (Electrical and Computer Engineering)
Examining committee member and department
Dinavahi, Venkata (Electrical and Computer Engineering)
Kumar, Amit (Mechanical Engineering)
Department of Electrical and Computer Engineering

Date accepted
Graduation date
Master of Science
Degree level
Distributed generation systems based on renewable energy sources have been experiencing rapid development in recent years. As well, a more recent concept called microgrid is developed by grouping a cluster of loads and paralleled DG units in a common local area. This thesis focuses on the power control of power electronics interfaced low-voltage microgrid in islanding operation. A novel frequency-voltage frame transformation is proposed to improve the system stability and offset the power coupling in a low-voltage grid. A control algorithm to guarantee that the microgrid can be operated within the predetermined voltage and frequency variation limits is also proposed. Moreover, an adaptive reactive power droop method is proposed, which automatically updates the maximum reactive power limit of a DG unit based on its current rating and actual real power output, and features an enlarged power output range and improved system stability. Both simulation and experimental verification results are provided.
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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