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Modeling, Measurement and Mitigation of Power System Harmonics Open Access


Other title
Harmonic Filters
Harmonic Mitigation
Power System Harmonics
Power System Interharmonics
Compact Fluorescent Lamps
Home Appliances
Harmonic Attenuation
Type of item
Degree grantor
University of Alberta
Author or creator
Nassif, Alexandre
Supervisor and department
Xu, Wilsun (Electrical and Computer Engineering)
Examining committee member and department
Xu, Wilsun (Electrical and Computer Engineering)
Heidrick,Ted (Mechanical Engineering, University of Alberta)
Jatskevich, Juri (Electrical and Computer Engineering, University of British Columbia)
Dinavahi, Venkata (Electrical and Computer Engineering)
Li, Yunwei (Electrical and Computer Engineering)
Electrical and Computer Engineering

Date accepted
Graduation date
Doctor of Philosophy
Degree level
Power system harmonics and interharmonics are power quality concerns that have received a great deal of attention in recent years. These phenomena can have several adverse effects on power system operation. The main harmonic and interharmonic sources are devices based on power electronics. An emerging class of harmonic sources is comprised of power electronic-based home appliances. These appliances are dispersed throughout the low-voltage distribution system, and their collective impact can result in unacceptable levels of voltage distortion. The characterization of home appliances based on their harmonic currents is an important step toward understanding the impact of these devices. This thesis presents an evaluation of the relative severity of the harmonic currents from these devices, and the impact of the disparity of the harmonic current phase angles. Typically, the voltage supplied to each harmonic source is already distorted. This distortion causes a change of the harmonic current magnitudes (traditionally referred to as the attenuation effect). Common harmonic analysis methods cannot take this variation into account because they use a typical harmonic current source model specified by a supply voltage having little or no distortion. This thesis characterizes the harmonic attenuation effect of power electronic-based appliances. One of the findings is that harmonic amplification, rather than attenuation, can occur under credible voltage conditions. This finding had not been made previously. In order to include the harmonic attenuation/amplification in appliance modeling, a measurement-based harmonic modeling technique is proposed. One of the most economic and effective ways to mitigate harmonics in power systems is through the use of harmonic shunt passive filters. These filters can be of many topologies. Selecting these topologies is a task that, today, depends on the experience and judgment of the filter designer. An investigation is carried out on the common filter topologies, and the most cost-effective topologies for mitigating harmonics are identified. As many of the larger harmonic loads also generate interharmonics, interharmonics have become prevalent in today’s medium-voltage distribution system. Mitigation cannot be carried out until the interharmonic-source location is known. A method for interharmonic source determination is proposed and then verified through simulation and field measurement studies.
License granted by Alexandre Nassif ( on 2009-08-17T17:48:57Z (GMT): 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 the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein 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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