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Grid phase and harmonic detection using cascaded delayed signal cancellation technique Open Access


Other title
harmonic detection
delayed signal cancellation (DSC)
phase-locked loop (PLL)
cascaded delayed signal cancellation (CDSC)
grid phase detection
Type of item
Degree grantor
University of Alberta
Author or creator
Wang, Yifei
Supervisor and department
Li, Yunwei (Electrical and Computer Engineering)
Examining committee member and department
Prasad, Vinay (Chemical and Material Engineering)
Mohamed, Yasser Abdel-Rady I. (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering

Date accepted
Graduation date
Master of Science
Degree level
Power converters are indispensable in modern energy conversion and utilization systems. For their control, there are two interesting topics: one is grid phase detection for their grid-tied operation; the other is harmonic detection for power quality improvement. Both problems involve sequence separation and signal detection, which is always challenged by voltage unbalance, harmonics and other disturbances. It is revealed in this thesis that the solution to the two problems can be rooted in the same technique, namely cascaded delayed signal cancellation (CDSC), which can isolate the positive-sequence fundamental signal from arbitrary harmonic patterns. It can be further renovated to extract any harmonic. Based on it, an advanced phase-locked loop system can be built for rapid, accurate and frequency adaptive grid phase and harmonic detection. For the practical implementation of the system, an effective discretization error reduction method is also developed. All system performances are verified by experiments.
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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