Control of an LCC HVDC system for connecting large offshore wind farms with special consideration of grid fault

Sarah Foster, Lie Xu, Brendan Fox

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

35 Citations (Scopus)


This paper describes the control and operation of an HVDC system comprising a line-commuted converter (LCC) HVDC and a STATCOM for connecting offshore wind farms based on DFIGs. During fault on the main grid, fast communications have previously been relied upon to make the wind farm aware of the condition and reduce its power output. Here, an alternative method is examined which enables automatic power balancing during fault. This is achieved through frequency modulation on the offshore network via the STATCOM. Several methods of fault detection using frequency threshold, rate of change of frequency (ROCOF) and rate of change of AC voltage (ROCOVac) are used to indicate when the wind farm power output should be reduced to achieve power balancing, and are compared with results using direct communications. PSCAD/EMTDC simulations show the effectiveness of the proposed control, which allows for faster fault identification. As a result the STATCOM DC over-voltage can be significantly reduced, requiring small DC capacitor, and tripping of the wind farm can be avoided.
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 pages8
ISBN (Print)978-1-4244-1905-0
Publication statusPublished - 2008
EventIEEE PES General Meeting 2008 - Pittsburgh, United States
Duration: 21 Jul 2008 → …


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


  • frequency modulation
  • power generation faults
  • automatic power balancing
  • grid fault
  • frequency threshold
  • large offshore wind farms connection
  • wind power plants


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