An advanced protection scheme for enabling an LVDC last mile distribution network

Abdullah A. S. Emhemed, Graeme M. Burt

Research output: Contribution to journalArticlepeer-review

170 Citations (Scopus)
452 Downloads (Pure)


Low voltage direct current (LVDC) distribution systems have the potential to support future realisation of smart grids and enabling of increased penetration of distributed renewables, electric vehicles, and heat pumps. They do however present significant protection challenges that existing schemes based on DC fuses and conventional electro-mechanical circuit breakers (EMCBs) cannot manage due to the nature of DC faults and slow device performance. Therefore, this paper presents an advanced protection scheme that addresses the outstanding challenges for protecting an LVDC last mile distribution network. The scheme takes advantage of advanced local measurements and communications that will be naturally integrated in smart grids, and the excellent level of controllability of solid state circuit breakers. It thus provides fast DC fault detection and interruption during DC transient periods in addition to achieving fault limitation and fast reliable restoration. The introductory part of the paper quantifies the potential benefits of LVDC last mile distribution networks, and discusses the potential LVDC architectures that best utilise the existing plant. Based on the new LVDC architectures, a typical UK LV network is energised using DC and modelled, and used as a case study for investigating the protection issues and evaluating the new protection scheme performance through simulation.
Original languageEnglish
Pages (from-to)2602 - 2609
Number of pages8
JournalIEEE Transactions on Smart Grid
Issue number5
Publication statusPublished - 21 Jul 2014


  • low voltage direct current (LVDC) distribution systems
  • solid state circuit breakers
  • smart grid
  • power system protection
  • distributed energy resources


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