Average value modeling of a thyristor-based hybrid three-level power converter for high voltage direct current (HVDC) transmission
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Eyvazizadeh Khosroshahi, Alireza
issued: 2021-06-02T14:28:50Z
issued: 2021
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Growing demand for clean electricity has increased the importance and need of interface devices in power systems. High Voltage Direct Current (HVDC) systems seem to be a promising solution for future power systems. Hybrid topologies combine continuous AC side current, reactive power control, lower harmonics, smaller footprint, ability to supply weak AC grids, and black-start capability advantages of voltage source converters with low conduction loss advantage of line commutated converters. Hence, among different HVDC technologies, hybrid converters that combine thyristor based current source converters with multi-level modular converters (MMC) are predicted to prevail over other topologies. However, in practical systems the number of submodules in MMC-type converters is high. Therefore, the admittance matrix for these systems becomes very large and the detailed switching-based models are computationally inefficient to represent these systems in electromagnetic transient (EMT) type simulation environments. Average value modeling is a good solution for decreasing the complexity and increasing the computational efficiency of the detailed models. However, none of the previous research has focused on hybrid topologies with combined thyristors and insulated gate bipolar transistors (IGBTs) for converter valves. This thesis is filling the gap and develops detailed equivalent model (DEM), switching function based model (SFM), average chain-link model (ACM), and standard average value model (SAVM) for a thyristor-based hybrid three-level converter (TH3LC). During normal operation of TH3LC, the converter needs to block a few submodules in the commutation chain-link and therefore none of the previous models in the literature has implemented this feature for this converter. In this thesis, firstly different models are developed and formulated for TH3LC. Then, all the models are simulated and validated in MATLAB® Simulink environment. The results show that based on the study typ…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/78508
note: Average Value Modeling of a Thyristor-Based Hybrid Three-Level Power Converter for High Voltage Direct Current (HVDC) Transmission by Alireza Eyvazizadeh Khosroshahi B.Sc., Islamic Azad University, 2016 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Electrical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) May 2021 © Alireza Eyvazizadeh Khosroshahi, 2021 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: Average Value Modeling of a Thyristor-Based Hybrid Three-Level Power Converter for High Voltage Direct Current (HVDC) Transmission submitted by Alireza Eyvazizadeh Khosroshahi in partial fulfillment of the requirements of the degree of Master of Applied Science in Electrical Engineering . Dr. Liwei Wang - Faculty of Applied Science Supervisor Dr. Wilson Eberle - Faculty of Applied Science Supervisory Committee Member Dr. Morad Abdelaziz - Faculty of Applied Science Supervisory Committee Member Dr. Sina Kheirkhah - Faculty of Applied Science University Examiner iii Abstract Growing demand for clean electricity has increased the importance and need of interface devices in power systems. High Voltage Direct Current (HVDC) systems seem to be a promising solution for future power systems. Hybrid topologies combine continuous AC side current, reactive power control, lower harmonics, smaller footprint, ability to supply weak AC grids, and black-start capability advantages of voltage source converters with low conduction loss advantage of line commutated converters. Hence, among different HVDC technologies, hybrid converters that combine thyristor based current source converters with multi-level modular converters (MMC) are predicted to prevail over other topologies. However, in practical systems the number of submodules in MMC-type converters is high. Therefore, the…
has type: Thesis/Dissertation
date issued: 2021-05
is shown at: 10.14288/1.0398226
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
type: Text
identifier URI: http://hdl.handle.net/2429/78508