Analysis of voltage source converter-based high-voltage direct current under DC line-to-earth fault

John Rafferty, Lie Xu, John Morrow

Research output: Contribution to journalArticle

28 Citations (Scopus)
1311 Downloads (Pure)

Abstract

DC line faults on high-voltage direct current (HVDC) systems utilising voltage source converters (VSCs) are a major issue for multi-terminal HVDC systems in which complete isolation of the faulted system is not a viable option. Of these faults, single line-to-earth faults are the most common fault scenario. To better understand the system under such faults, this study analyses the behaviour of HVDC systems based on both conventional two-level converter and multilevel modular converter technology, experiencing a permanent line-to-earth fault. Operation of the proposed system under two different earthing configurations of converter side AC transformer earthed with converter unearthed, and both converter and AC transformer unearthed, was analysed and simulated, with particular attention paid to the converter operation. It was observed that the development of potential earth loops within the system as a result of DC line-to-earth faults leads to substantial overcurrent and results in oscillations depending on the earthing configuration.
Original languageEnglish
Pages (from-to)428–438
Number of pages11
JournalIET Power Electronics
Volume8
Issue number3
Early online date22 Dec 2014
DOIs
Publication statusPublished - Mar 2015

Keywords

  • DC line faults
  • voltage analysis
  • voltage source converters
  • power system reliability
  • overcurrent protection
  • power system faults
  • transformers

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