DC-fault tolerant multilevel voltage source converters with hybrid and multiplexed-arm structures for high voltage direct current applications
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Bieber, Levi Michael
issued: 2024-02-01T08:00:00Z
issued: 2023
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Today’s state-of-the-art voltage-source-converter high-voltage direct-current (VSC-HVDC) technology uses modular-multilevel converters (MMCs) for their highly efficient AC/DC conversion and filterless operation. However, half-bridge submodule-based (HBSM) MMCs lack inherent DC-fault protection and require significantly more capacitive energy storage than the previous generation of converters, leading to converter stations of immense size and cost. This dissertation proposes six novel VSC-HVDC-based technologies that amend the MMC’s disadvantages. Firstly, this dissertation presents three converter technologies: the Hybrid Three-Level Converter (H3LC), the Thyristor-based Hybrid Three-Level Converter (TH3LC), and the Hybrid Five-Level Converter (H5LC), which use AC-side cascaded submodules (SMs) and share a similar operating principle. Secondly, three converters that use DC-side cascaded SMs are proposed, including the Dual-Arm Converter (DAC), the Quad-Arm Converter (QAC), and the Multiplexed-Stack Converter (MSC), which require fewer SMs than the MMC by using proposed multiplexed converter arms (M-Arms). All the proposed converters have DC-fault protection enabled inherently --- for the TH3LC, DAC, QAC, and MSC --- or by novel DC-fault-blocking mechanisms in the cases of the H3LC and H5LC. Results from HVDC-scale simulation studies are presented for all converters to demonstrate their proposed operating principles as well as to determine their expected semiconductor losses; meanwhile, lab-scale hardware verifications are presented for three converters. Analytical methods are proposed to programmatically calculate the converters' theoretical energy storage requirements and semiconductor losses. The proposed converters all have reduced energy storage requirements compared to the MMC, with the H3LC requiring approximately one-tenth of the MMC's energy storage. The TH3LC displays the highest efficiency of the proposed converters and has inherent DC-fault tolerance. The…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/83819
note: DC-Fault Tolerant Multilevel Voltage Source Converterswith Hybrid and Multiplexed-Arm Structures for HighVoltage Direct Current ApplicationsbyLevi Michael BieberB.A.Sc. HONS., The University of British Columbia, 2018A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THEREQUIREMENTS FOR THE DEGREE OFDOCTOR OF PHILOSOPHYinTHE COLLEGE OF GRADUATE STUDIES(Electrical Engineering)The University of British Columbia(Okanagan)February 2023© Levi Michael Bieber, 2023The following individuals certify that they have read, and recommend to the College ofGraduateStudies for acceptance, a dissertation entitled:DC-Fault Tolerant Multilevel Voltage Source Converters with Hybrid andMultiplexed-Arm Structures forHighVoltage Direct CurrentApplicationssubmitted by Levi Michael Bieber in partial fulfillment of the requirements for the degree ofDoctor of Philosophy in Electrical Engineering.Examining Committee:Dr. Liwei Wang, School of EngineeringSupervisorDr. Juri Jatskevich, The University of British Columbia—VancouverCo-supervisorDr. Wilson Eberle, School of EngineeringSupervisory Committee MemberDr. Christine Chen, The University of British Columbia—VancouverSupervisory Committee MemberDr. Peter Lehn, The University of TorontoAdditional ExaminerAdditional Supervisory Committee Members:Dr. Mohammad Arjmand, School of EngineeringUniversity ExamineriiAbstractToday’s state-of-the-art voltage-source-converter high-voltage direct-current (VSC-HVDC)technology uses modular-multilevel converters (MMCs) for their highly efficient AC/DCconversion and filterless operation. However, half-bridge submodule-based (HBSM) MMCslack inherent DC-fault protection and require significantly more capacitive energy storage thanthe previous generation of converters, leading to converter stations of immense size and cost.This dissertation proposes six novel VSC-HVDC-based technologies that amend theMMC’sdisadvantages. Firstly, this dissertation presents three converter technologies: the HybridThree-Level Converter (H3…
has type: Thesis/Dissertation
date issued: 2023-05
is shown at: 10.14288/1.0424330
language: eng
degree discipline: Electrical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Wang, Liwei
contributor: Jatskevich, Juri
type: Text
identifier URI: http://hdl.handle.net/2429/83819