Adaptive distance protection for multi-terminal lines connecting converter-interfaced renewable energy sources

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Variation in infeed current challenges the distance relay performance significantly for protection of multi-terminal lines. Underreach issue with such a line configuration becomes more prominent for a relay at the substation when connected to renewable sources, due to generation variability and converter control operation. This may result in an incorrect decision by the distance relay, especially with a fixed zone-1 setting. In this paper an adaptive distance relaying method is proposed for such line configurations. The method obtains the remote end data during pre-fault and calculates the fault distance to derive accurate protection decision. Performance of the proposed method is tested for a three-terminal line using PSCAD/EMTDC. Comparative assessment with conventional distance relaying demonstrates the superiority of the proposed method.
Original languageEnglish
Number of pages5
Publication statusPublished - 8 Mar 2022
EventIET 16th International Conference on Developments in Power System Protection - Hilton Newcastle Gateshead, Newcastle , United Kingdom
Duration: 7 Mar 202210 Mar 2022


ConferenceIET 16th International Conference on Developments in Power System Protection
Abbreviated titleIET 16th DPSP
Country/TerritoryUnited Kingdom
Internet address


  • distance relaying
  • multi-terminal lines
  • renewable energy sources
  • power system faults
  • zone-1 setting

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