Elimination of slack bus iteration/droop bus iteration in sequential ac-dc power flow algorithm
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Malik, Abrar Muhammad Ali
issued: 2020-10-21T18:00:30Z
issued: 2020
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: High Voltage Direct Current (HVDC) transmission is a power transmission technology used for integrating large-scale renewable energy over long distances into AC grid. It uses power electronics technology to convert the electric power from AC systems into DC and then transmits this power over long distances and finally converts back DC into AC systems to inject power into AC grid. Current-Sourced Converters (CSC) and voltage-Sourced Converters (VSC) are two major converters deployed in HVDC. The Multi Terminal DC (MTDC) system is a DC grid having multiple terminals containing several converters connected to a common DC system. One converter end is connected to the DC grid and its other end is connected to the AC grid thus forming an integrated AC-DC grid. One converter regulates the constant DC voltage at the DC bus and is called as DC slack bus converter while the other converters regulate their power output to the AC grid. This DC slack bus also performs the voltage droop control function in combination with other converters to regulate DC grid voltage. These converters share power flows between DC and AC sides under two types of power flow algorithms, i.e., unified power flow and sequential power flow methods. This thesis focuses on sequential power flow algorithm to solve AC-DC power flow equations separately and in a sequence. The iterative solution of sequential AC-DC power flow algorithms requires solving extra iteration loop to find the unknown power losses in DC slack or droop bus converters. This extra iteration loop causes additional computational burden on the top of iterative solution. This thesis aims to eliminate Slack Bus Iteration (SBI) or Droop Bus Iteration (DBI) while preserving the accuracy of the AC-DC power flow results. The proposed algorithm brings modification in converter loss formula by applying the AC-DC power balance principle. Simulation results are based on IEEE New England 39-bus system with 6-bus DC grid and demonstrate the accuracy …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/76320
note: ELIMINATION OF SLACK BUS ITERATION / DROOP BUS ITERATION IN SEQUENTIAL AC-DC POWER FLOW ALGORITHM by Abrar Muhamad Ali Malik B.Sc., University of Engineering and Technology, Lahore, Pakistan, 2000 A THESIS SUBMITTED IN PARTIAL FULLFILMENT OF THE REQUIREMENT FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Electrical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) October 2020 © Abrar Muhammad Ali Malik, 2020 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: ELIMINATION OF SLACK BUS ITERATION / DROOP BUS ITERATION IN SEQUENTIAL AC-DC POWER FLOW ALGORITHM submitted by Abrar Muhammad Ali Malik in partial fulfillment of the requirements of the degree of Master of Applied Science in Electrical Engineering Dr. Liwei Wang Supervisor, School of Engineering (Electrical) Dr. Wilson Eberle Supervisory Committee Member, School of Engineering (Electrical) Dr. Morad Abdelaziz Supervisory Committee Member, School of Engineering (Electrical) Dr. Sina Kheirkhah University Examiner, School of Engineering (Mechanical) iii Abstract High Voltage Direct Current (HVDC) transmission is a power transmission technology used for integrating large-scale renewable energy over long distances into AC grid. It uses power electronics technology to convert the electric power from AC systems into DC and then transmits this power over long distances and finally converts back DC into AC systems to inject power into AC grid. Current-Sourced Converters (CSC) and voltage-Sourced Converters (VSC) are two major converters deployed in HVDC. The Multi Terminal DC (MTDC) system is a DC grid having multiple terminals containing several converters connected to a common DC system. One converter end is connected to the DC grid and its other end is connected to the AC grid thus forming an integrated AC-DC grid. One converter regulates the constant DC voltage at the DC bu…
has type: Thesis/Dissertation
date issued: 2020-11
is shown at: 10.14288/1.0394774
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
type: Text
identifier URI: http://hdl.handle.net/2429/76320