Fault analysis of an islanded Multi-microgrid

S. A. Gopalan, V. Sreeram, H. H.C. Iu, Zhao Xu, Z. Y. Dong, K. P. Wong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

15 Citations (Scopus)


A microgrid (MG) is one way of integrating several low capacity renewable energy sources with a distribution grid. Multi-microgrids (MMG) originally proposed by the EU More Microgrids project can combine several MGs along with other distributed generation (DG) sources into the distribution grid. While different aspects of MMGs have been previously studied, a protection system design for it is yet to be explored. To design protection systems for MMGs, it is first necessary to study their fault characteristics. In this paper, we report on the fault analysis of an MMG consisting of two MGs, each made up of a diesel generator and a number of PV sources and wind generators. Fault analysis is carried out by simulating different fault types in the MMG with the distribution grid islanded from the transmission grid, and compared with fault currents in a single islanded MG. A theoretical analysis is also performed to verify the simulation results. The fault analysis results can be used to configure relay settings and to select the most appropriate circuit breakers and measurement devices for the MMG.
Original languageEnglish
Title of host publication2012 IEEE Power and Energy Society General Meeting, PES 2012
Publication statusPublished - 11 Dec 2012
Event2012 IEEE Power and Energy Society General Meeting, PES 2012 - San Diego, CA, United States
Duration: 22 Jul 201226 Jul 2012


Conference2012 IEEE Power and Energy Society General Meeting, PES 2012
Country/TerritoryUnited States
CitySan Diego, CA


  • fault analysis
  • microgrid
  • multi-microgrid

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering


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