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Permanent link (DOI): https://doi.org/10.7939/R3K931M39

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Investigation, Identification and Mitigation of Harmonic Distortions in Power Systems Open Access

Descriptions

Other title
Subject/Keyword
Multiple linear regression
Independent component analysis
C-type filter
Residential harmonics
Harmonic resonance
Harmonic distortion
Harmonic source identification
Shunt capacitor
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wang, Yang
Supervisor and department
Xu, Wilsun (Electrical and Computer Engineering)
Examining committee member and department
Krzymien, Witold (Electrical and Computer Engineering)
Kish, Greg (Electrical and Computer Engineering)
Marti, Jose (Electrical and Computer Engineering)
Marquez, Horacio (Electrical and Computer Engineering)
Liang, Hao (Electrical and Computer Engineering)
Department
Department of Electrical and Computer Engineering
Specialization
Energy Systems
Date accepted
2017-09-26T10:07:30Z
Graduation date
2017-11:Fall 2017
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Harmonic distortion has always been an important power quality concern for utilities and customers. In recent years, a wide variety of harmonic-producing loads, ranging from home appliances to industrial equipment, is being connected to power systems due to rapid advancement in power electronic technology. These harmonic sources can be grouped into two categories – distributed harmonic sources and concentrated harmonic sources. Distributed harmonic sources are associated with small power-electronic-based loads such as home appliances and office equipment. They are located randomly in distribution systems. Based on extensive field measurements and analysis, this thesis reveals the harmonic distortion characteristics in current distribution systems, especially those supplying residential customers. A main impact of increased harmonic sources is the system-capacitor resonance. This thesis further proposes a scheme to damp harmonic resonance for multiple switchable capacitors using a shared damping block. This damping block is designed in such a way that it will provide adequate damping capability for all possible on/off combinations of the capacitors involved. Performance and effectiveness of the proposed scheme are demonstrated through the comparative study on actual capacitor application cases. Concentrated harmonic sources are those industrial and commercial facilities that contain a large amount of nonlinear loads. When a harmonic problem occurs in a system with several such facilities as suspects, the first step is to determine which loads cause the harmonic problem. The second part of this thesis presents two measurement-based methods that can quantify the respective harmonic contributions of multiple concentrated harmonic sources to a harmonic problem. The first method is based on multiple linear regression (MLR). The second method advances the MLR-based method by including synchronized harmonic phasor data and by adopting independent component analysis (ICA). Performances of these methods have been demonstrated using simulation verifications, lab experiments and field measurements. The proposed methods are expected to become useful tools for power quality management.
Language
English
DOI
doi:10.7939/R3K931M39
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. 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.
Citation for previous publication
Chapter 2 of this thesis has been published as Y. Wang, J. Yong, Y. Sun, W. Xu and D. Wong, "Characteristics of Harmonic Distortions in Residential Distribution Systems," in IEEE Transactions on Power Delivery, vol. 32, no. 3, pp. 1495-1504, June 2017. I was responsible for the field measurement, data analysis and the manuscript composition. Dr. Jing Yong and Dr. Yuanyuan Sun were responsible for the data analysis and the manuscript composition. Dr. Wilsun Xu supervised the work. Daniel Wong provided feedbacks to improve the manuscript.Chapter 4 of this thesis has been published as Y. Wang, H. E. Mazin, W. Xu and B. Huang, "Estimating Harmonic Impact of Individual Loads Using Multiple Linear Regression Analysis", in International Transactions on Electrical Energy Systems, vol. 26, no. 4, pp. 809-824, Apr. 2016. I proposed the idea, conducted the verification studies and composed the manuscript. Dr. Hooman E. Mazin initiated the research and helped me improve the simulation code. Dr. Wilsun Xu supervised the work. Dr. Biao Huang provided the supervisions on the statistical algorithms.Chapter 5 of this thesis has been published as Y. Wang, W. Xu, J. Yong and K. Chen, "Estimating Harmonic Impact of Individual Loads Using Harmonic Phasor Data", in International Transactions on Electrical Energy Systems, accepted on May 7th, 2017, in press. I proposed the idea, conducted the verification studies and composed the manuscript. Dr. Wilsun Xu supervised the work, provided the guidance and revised the manuscript. Dr. Jing Yong provided feedbacks to improve the manuscript. Dr. Kun-Long Chen helped conduct the lab experiment.

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