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An Investigation on Harmonic Filtering Techniques in Power Systems
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- Author / Creator
- Li, Xin
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Harmonic filtering is an effective method to mitigate harmonic distortions in power systems. Over the last decades, a number of harmonic filtering techniques have been proposed to deal with the increasing proliferation of harmonic-producing loads. Among these techniques, passive harmonic filtering is still the primary choice of industry, especially in medium and high voltage systems. In spite of its widespread application, there are still a lot of filter design issues that need clarifications. There is also a need to develop new filtering schemes that can overcome the limitations of existing schemes.
This thesis first clarifies design issues for several common passive filters. An equivalent circuit model is introduced to define the filter design problem in industrial systems. Four passive filter topologies are investigated. Design factors such as parameter variations, quality factor selection and filter power loss etc. are analyzed. Improved design methods are then developed based on such analysis. Effectiveness of the improved design methods are demonstrated through comparative case studies.
The thesis then proposes a new filter to mitigate harmonic and interharmonic resonance associated with multi-pulse converter systems. The core idea behind this filter is a frequency-dependent damping block that is able to achieve a high damping performance for a wide frequency range. Application of this filter to multi-pulse variable speed drives and HVDC links are demonstrated. Case study indicates that the proposed filter is a cost-effective solution for harmonic mitigation of multi-pulse converters.
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- Subjects / Keywords
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- Graduation date
- Fall 2019
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- Type of Item
- Thesis
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- Degree
- Doctor of Philosophy
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- License
- 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.