DC fault analysis of VSC based multi-terminal HVDC systems

John Rafferty, Lie Xu, D John Morrow

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

49 Citations (Scopus)


The use of Voltage Source Converter (VSC) based HVDC transmission has been strongly suggested for the interconnection of various power networks. However, VSCs susceptibility to DC faults, particularly the potential damage caused to the converter IGBTs due to overcurrent, is an issue that must be addressed. This paper analyses the behaviour of a VSC-based HVDC system under varying DC fault conditions. A two terminal multi-terminal DC system, consisting of a single sending and receiving end is used as a case study. Recharging of the DC link Capacitor after a DC line-to-line fault was found to act as additional damping for the AC fault current, helping to reduce the AC current offset. Also, it was discovered that the development of potential earth loops with the system as a result of DC lineto-earth faults can lead to substantial overcurrent if an effective earthing scheme is not in place.
Original languageEnglish
Title of host publication10th IET International Conference on AC and DC Power Transmission (ACDC 2012)
Number of pages6
Publication statusPublished - Dec 2012
EventIET AC/DC conference 2012 - Birmingham, United Kingdom
Duration: 3 Dec 2012 → …


ConferenceIET AC/DC conference 2012
Country/TerritoryUnited Kingdom
Period3/12/12 → …


  • fault currents
  • overcurrent protection
  • damping
  • DC line-to-line fault analysis


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