Fault current characterisation in VSC-based HVDC systems

Sul Ademi, Dimitrios Tzelepis, Adam Dysko, Sankara Subramanian, Hengxu Ha

Research output: Contribution to conferencePaper

7 Citations (Scopus)
545 Downloads (Pure)

Abstract

The DC-side line faults in high-voltage direct-current (HVDC) systems utilising voltage-source converters (VSCs) are a major concern for multi-terminal HVDC systems in which complete isolation of the faulted system is not a viable option. A number of challenges are posed by both pole-to-pole and pole-to-ground faults including the presence of very fast and high amplitude discharge current from the DC-link capacitance, the lack of suitable DC current breaking devices, and the lack of highly discriminative fault detection techniques. Therefore, faults occurring along the interconnecting DC cables are likely to threaten system operation. In order to better understand the system under such faults, this paper analyses the behaviour of HVDC systems energised by the conventional two-level VSC. This investigation provides a systematic evaluation of the nature of a DC fault in HVDC systems during a permanent pole- to-pole and pole-to-ground fault taking into consideration a number of influencing parameters including fault position, fault resistance and other operational conditions. To quantify these dependencies on DC voltage and current characteristics a systematic simulation study is undertaken in which the natural responses of the HVDC networks transients during DC side faults are examined. The outcome of this paper lies the necessary knowledge foundation for developing future DC protection methods.
Original languageEnglish
Number of pages7
Publication statusPublished - 7 Mar 2016
EventThe 13th IET International Conference on Developments in Power System Protection 2016 - The Sheraton Hotel, Edinburgh, United Kingdom
Duration: 7 Mar 201610 Mar 2016

Conference

ConferenceThe 13th IET International Conference on Developments in Power System Protection 2016
Abbreviated titleDPSP 2016
CountryUnited Kingdom
CityEdinburgh
Period7/03/1610/03/16

Keywords

  • Fault characterisation
  • fault location
  • voltage-source converter
  • dc fault protection
  • high-voltage direct-current

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    Ademi, S., Tzelepis, D., Dysko, A., Subramanian, S., & Ha, H. (2016). Fault current characterisation in VSC-based HVDC systems. Paper presented at The 13th IET International Conference on Developments in Power System Protection 2016, Edinburgh, United Kingdom.