A master thesis from Aalborg University
Power Oscillation Damping Using Expandable VSC-HVDC Transmission System
Author(s)
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-01
Pages
66 pages
Abstract
This thesis refers to the expansion of the COBRAcable by adding an offshore wind farm converter into the existing point--to--point HVDC link, as envisioned by Cigre. The focus is placed on the examination of the influence of the added terminal into the existing power oscillation damping control function and the tuning of the latter for the expanded three--terminal system. Initially, a simple two--area AC system modelled in DIgSILENT PowerFactory is utilized in order to excite inter--area oscillations in it. The HVDC system is modelled as a half-bridge modular multilevel converter based voltage-sourced converter system. The POD control function is added on top of the converters' main control configuration and the HVDC link is connected to the AC system. The latter is subjected to a disturbance and the POD performance is assessed. Subsequently, the additional offshore terminal is added to the existing PtP configuration with the onshore converters operating under two different control modes, i.e. master--slave and DC voltage droop control mode and its influence into the POD function is examined by varying the output power profiles of the wind farm. Finally, the output of the POD controller is compensated with the aim of improving the damping performance when the converters operate in DC voltage droop control mode.
Keywords
Documents
Colophon: This page is part of the AAU Student Projects portal, which is run by Aalborg University. Here, you can find and download publicly available bachelor's theses and master's projects from across the university dating from 2008 onwards. Student projects from before 2008 are available in printed form at Aalborg University Library.
If you have any questions about AAU Student Projects or the research registration, dissemination and analysis at Aalborg University, please feel free to contact the VBN team. You can also find more information in the AAU Student Projects FAQs.