pipeline-types-with-appendix-popl-2022
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University of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source Coii pipeline-types-with-appendix-popl-2022ivertersYusi LiuL'niwrsify ofArkamai, FayettevilleFollow this and additional works at: http://scholarworks.uark.edu/etdÓ* Part of the Electrical and Electronics Commons, and the Power and Energy CommonsRecommended CitationLiu, Yusi, ■Reali?at>on of .1 High Power Mtcrogrid Based on Voltage Source Con pipeline-types-with-appendix-popl-2022verters' (2017). Hieses and Diisertatwrii. 2491. http:?/schobrworks.iurkedu/etd/2491This Dtacrutioci» brought to you for fee and open access by SchóbApipeline-types-with-appendix-popl-2022
VockMịữưARK. It hi> been accepted for induMon In Thews and Dkmxuuom by .in authorized administrator of SchclirWorl«i®VARK. For more informition. ptcawUniversity of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source Coii pipeline-types-with-appendix-popl-2022partial fulfillment of the requirements for the degree of Doctor of Philosophy in EngineeringbyYusi Liu Florida State University Master of Science in Electrical Engineering. 2011August 2017 University of ArkansasThis dissertation is approved for recommendation to the Graduate Council.Dr. H. Alan Man pipeline-types-with-appendix-popl-2022tooth Dissertation DirectorDr. Juan Carlos BaidaCommittee MemberDr. Roy A. McCann Committee MemberDr. Qinghua Li Committee MemberAbstractMicrogrid conpipeline-types-with-appendix-popl-2022
cepts are gradually becoming more popular because they arc expected to interface with renewable energies, increase end users’ reliability and resilienUniversity of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source Coii pipeline-types-with-appendix-popl-2022nterfaces, such as ac-dc. dc-dc. and dc-ac converters. The converter design and control arc critical to the stability and efficiency ol'a microgrid.A microgrid may operate in either gird connected mode or islanded mode [1 J. Tn terms of stability, the grid connected mode is less challenging compared pipeline-types-with-appendix-popl-2022 to the islanded mode of operation due to the nearly infinite ac bus having a very small equivalent impedance. This results in negligible interferencepipeline-types-with-appendix-popl-2022
between multiple converters. High power converters [2] operating in islanded mode encounter stability problems due to their relatively small impedancUniversity of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source Coii pipeline-types-with-appendix-popl-2022 modeling and control methods of high power voltage source converters are reviewed. Traditional methods of designing low power ac filters may not expand to high power design directly. Most academic papers designed ac filler inductors which have a fixed inductance value. This dissertation proposed a pipeline-types-with-appendix-popl-2022variable inductor whose inductance value changes by a factor of three from low current to peak current, lhe variable inductor approach gives many benepipeline-types-with-appendix-popl-2022
fits with regard to high power microgrid applications. The design process of the inductor is described and simulation tools arc used to verify the feaUniversity of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source Coii pipeline-types-with-appendix-popl-2022 caused by the de capacitor bank may trigger over cunent protection, induce system oscillation, or even result in a system collapse. The reason of inrush current is analyzed in details. An improved soft-start control algorithm is proposed and the inrush cunent is greatly-reduced which is validated i pipeline-types-with-appendix-popl-2022n both simulation and experimental results.A microgrid hardware testbed prototype is proposed and tested successfully. The rating of the power convertpipeline-types-with-appendix-popl-2022
er described here is greater than 1 MVA.€2017 by Yusi Liu All Rights ReservedAcknowledgementsI would like to express my sincere gratitude to my Ph.D. University of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source Coii pipeline-types-with-appendix-popl-2022e students do not have access. In the past five years, he has shown me how to be a good researcher as well as a good man. To me. he set up one of the best examples of hard working and handling difficulties. Dr. Mantooth became president of the IEEE power electronics society (PELS) in 2017 and his le pipeline-types-with-appendix-popl-2022adership will influence me for the rest of my life. My gratimde also goes to my advisory committee members - Dr. Juan Carlos Baida. Dr. Roy A. McCann,pipeline-types-with-appendix-popl-2022
and Dr. Qinghua Li for their guidance during my Ph.D. research. Without Dr. Baida’s strict attinide regarding class work. I would not have gained theUniversity of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source Coii pipeline-types-with-appendix-popl-2022the team leader of our power electronics group under Dr. Mantooth. He not only provided tremendous technical help to every student but also took care to help in our daily lives. He introduced me to the world of digital controllers and it was my great pleasure to have collaborated with him in my proj pipeline-types-with-appendix-popl-2022ects. I had two internships at two prestigious companies, thus I would like to thank my mentors: Ed Lao from Google and Lu Jiang. Fei Pan from Yaskawapipeline-types-with-appendix-popl-2022
Solectria. They introduced me to the real life of R&D. I am very gratefill to Kim Gillow. Kathy Kirk. Beth Wilkins Benham. Karin Alvarado and Gina SwUniversity of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source CoiiUniversity of Arkansas, FayettevilleScholarWorksfiDUARKTheses and Dissertations42948Realization of a High Power Microgrid Based on Voltage Source CoiiGọi ngay
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