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Modeling and Mitigation of Harmonic Distortions Caused by Mass-Distributed Harmonic Sources
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- Author / Creator
- Ding, Tianyu
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In recent years, the proliferation of energy-efficient but harmonic-producing home appliances has significantly changed the nature of power system harmonic problems. One of the main concerns nowadays is the harmonics produced by small, mass-distributed harmonic sources. Their unique random and distributed nature brings new challenges to harmonic modeling and mitigation. This thesis presents methods to address some of the above challenges. They are (1) a method to model the collective impact of the mass-distributed harmonic sources in a secondary residential system and (2) three techniques to mitigate the harmonic distortions caused by the mass-distributed harmonic sources. For the first subject, this thesis develops an analytical method which incorporates both the random behavior and electrical characteristic of the residential loads in order to model the collective impact of the harmonic-producing home appliances in a secondary residential system. For the second subject, the three techniques developed in this thesis are as follows. The first one is a filtering scheme to prevent harmonics' penetration from residential distribution systems into the transmission systems. It utilizes the low-voltage tertiary winding of a distribution substation transformer to construct a low impedance path to realize harmonics' trapping. The second is an improved design method for the 3rd order high pass filter. It is established based on minimizing the filter fundamental frequency loss. This research also led to the third technique developed in this thesis, a method to create resonance-free shunt capacitors. Two configurations, the 3rd order high pass filter and C-type filter, are investigated for constructing the resonance-free capacitor. Design methods are developed, and their relative performance is studied. Extensive analytical and simulation studies are conducted to validate the above methods. The results confirm that these methods are effective for the modeling or mitigation of harmonic distortions caused by mass-distributed harmonic sources.
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- Graduation date
- Fall 2017
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- Type of Item
- Thesis
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- Degree
- Doctor of Philosophy
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.