Multi-terminal DC transmission systems for connecting large offshore wind farms

Lie Xu, Liangzhong Yao, Barry Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

157 Citations (Scopus)


This paper describes the use of voltage source converter (VSC) based, multi-terminal (MT) HVDC transmission system technology for connecting large doubly-fed induction generator (DFIG) based wind farms, over long distance. The operational principles of the proposed system are described and control strategies for coordinating various grid side converters are proposed, to ensure smooth system operation and power sharing between various AC networks. DC voltage control and DC droop characteristics are implemented for the grid side VSC which transmit wind farm generated power to AC grids. PSCAD/EMTDC simulations for a four-terminal DC system for connecting two wind farms to two different AC networks are presented to demonstrate robust performance during wind speed and power variations, and large disturbances caused by the trip of one of the wind farms.
Original languageEnglish
Title of host publication2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century
Number of pages7
ISBN (Print)978-1-4244-1905-0
Publication statusPublished - Jul 2008
EventIEEE PES General Meeting 2008 - Pittsburgh, United States
Duration: 21 Jul 2008 → …


ConferenceIEEE PES General Meeting 2008
Country/TerritoryUnited States
Period21/07/08 → …


  • voltage source converter
  • doubly fed induction generator
  • large offshore wind farms
  • HVDC transmission system technology
  • asynchronous generators


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