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Residential Distribution System Power Quality Improvement using DG-Grid Interfacing VSC

  • Author / Creator
    Munir, Md Shirajum
  • The increasing utilization of power electronic loads in today’s homes is a growing concern for utility companies due to the increased harmonic distortions. The harmonic problem is further complicated by the harmonic resonance introduced by other system components, such as the power factor correction (PFC) capacitors. At the same time, power industry is experiencing a paradigm shift as more renewable energy based distributed generation (DG) systems are being connected to the power distribution network. These DG systems are connected to the grid through DG-grid interfacing inverters which can be used to address the harmonic issue utilizing the available apparent power rating from the interfacing inverters. To ensure proper utilization of the available DG rating, this thesis discusses interfacing converter control method that actively mitigates the harmonics in residential distribution systems. The first objective is to determine the harmonic compensation priorities for DG converters in a given distribution system, considering harmonics load locations, PFC capacitors etc. To realize this objective, this thesis conducts an in-depth investigation of different control methods of VSI for power quality improvement. Then a modal analysis based approach is proposed to determine compensation priorities for different harmonics and at different distribution system nodes to improve harmonic compensation performance. The second objective of this thesis is to develop harmonic compensation functions on DC converters that can consider harmonics compensation priority, aggregated available DG ratings, loads, etc. To do so, a priority driven G-S droop based selective harmonic compensation scheme is proposed in this thesis that assigns compensation priorities on DGs with different ratings and operating at different distribution system nodes.

  • Subjects / Keywords
  • Graduation date
    Spring 2018
  • Type of Item
    Thesis
  • Degree
    Doctor of Philosophy
  • DOI
    https://doi.org/10.7939/R3222RN0J
  • 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.