Digital multi-relay protection for micro-grid systems

S. A. Saleh*, R. Ahshan

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)


This paper presents the development, implementation and performances of a digital multi-relay protection for micro-grids. The developed digital protection is based on extracting the second level high frequency sub-bands present in d-q-axis components of the currents flowing through each bus of a micro-grid. The desired frequency sub-bands are extracted using the wavelet packet transform (WPT), and are considered signatures for identifying fault currents and fault locations. The protective functions in the developed digital multi-relay protection are structured without adaptive features or relay-to-relay communications. This structure is established to accomplish fast response, simple implementation, independent functions, and minor sensitivity to levels of fault currents. The digital multi-relay protection is implemented for experimental testing on a laboratory micro-grid for various operating conditions. Experimental performances demonstrate high reliability, accuracy, and speed, along with negligible sensitivity to parameters of protected components and mode of operating the micro-grid.

Original languageEnglish
Title of host publication2012 IEEE Industry Applications Society Annual Meeting, IAS 2012
Publication statusPublished - 2012
Externally publishedYes
Event2012 IEEE Industry Applications Society Annual Meeting, IAS 2012 - Las Vegas, NV, United States
Duration: Oct 7 2012Oct 11 2012

Publication series

NameConference Record - IAS Annual Meeting (IEEE Industry Applications Society)
ISSN (Print)0197-2618


Other2012 IEEE Industry Applications Society Annual Meeting, IAS 2012
Country/TerritoryUnited States
CityLas Vegas, NV


  • Digital protective relays
  • micro-grids
  • power system protection
  • real-time systems
  • wavelet transforms

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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