Investigation of different system earthing schemes for protection of low voltage DC microgrids

Ahmad Makkieh, Abdullah Emhemed, Dong Wang, Adria Junyent-Ferre, Graeme Burt

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DC microgrids are expected to play an important role in maximising the benefits of distributed energy resources in future low carbon smart power systems. One of the remaining complex challenges is the requirement for effective DC protection solutions. The advancement of DC protection is hindered by the lack of good understanding and development of reliable and effective earthing schemes which can enable safe and secure operation of DC microgrids in both on-grid and off-grid modes. Therefore, this paper discusses different DC microgrid earthing opportunities, and comprehensively evaluates through detailed simulation studies the influence of different earthing methods on the fault behaviour of DC microgrid. A transient model of an active DC microgrid is developed in PSCAD/EMTDC and used for the paper studies.
Original languageEnglish
Pages (from-to)5129-5133
Number of pages5
JournalThe Journal of Engineering
Issue number18
Early online date15 Mar 2019
Publication statusPublished - 31 Jul 2019
EventThe 7th International Conference on Renewable Power Generation (RPG2018) - DTU, Lyngby, Copenhagen, Denmark
Duration: 26 Sept 201827 Sept 2018


  • DC earthing schemes
  • distribution network
  • fault current
  • low voltage DC microgrid
  • protection for safety


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