Traveling wave-based protection scheme for inverter-dominated microgrid using mathematical morphology

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Abstract

Inverter-dominated microgrids impose significant challenges on the distribution network, as inverters are well known for their limited contribution to fault current, undermining the performance of traditional overcurrent protection schemes. This paper introduces a new protection scheme based on the initial current traveling wave utilizing an improved mathematical morphology (MM) technology, with simplified polarity detection and new logics introduced for meshed networks and feeders with single-end measurement. The proposed protection scheme provides ultrafast response and can be adapted to varied system operational modes, topologies, fault conditions, and load conditions. Only low-bandwidth communication is required to achieve high-speed operation and adequate discrimination level in meshed networks. Simulation in PSCAD/EMTDC verifies both the sensitivity and stability of the proposed protection scheme under different microgrid operational scenarios.
Original languageEnglish
Pages (from-to)2211-2218
Number of pages8
JournalIEEE Transactions on Smart Grid
Volume5
Issue number5
Early online date19 Aug 2014
DOIs
Publication statusPublished - 1 Sep 2014

Keywords

  • distributed power generation
  • mathematical morphology
  • power distribution faults
  • power distribution protection

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