Fault management and protection of FREEDM systems

George G. Karady, Xing Liu

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

12 Scopus citations


FREEDM system is a computer-controlled distribution system with distributed generation, electronic loads and circuit breakers. The protection methods used in legacy distribution systems are too slow to protect the electronic loop. This paper determines the fault-produced short circuit current, which is a square shaped current wave with 2-3 times rated current amplitude. The fault will be identified by the detection of the change in the shape of the current waves. The fault location will be determined by a GPS-synchronized wireless digital pilot protection system. The major components of the protection system are identified, and system operation is verified by computer simulation.

Original languageEnglish (US)
Title of host publicationIEEE PES General Meeting, PES 2010
StatePublished - 2010
EventIEEE PES General Meeting, PES 2010 - Minneapolis, MN, United States
Duration: Jul 25 2010Jul 29 2010

Publication series

NameIEEE PES General Meeting, PES 2010


OtherIEEE PES General Meeting, PES 2010
Country/TerritoryUnited States
CityMinneapolis, MN


  • Digital relay protection
  • Fault detection
  • Optical current transformer
  • Pilot protectionl
  • Short circuit current

ASJC Scopus subject areas

  • Energy Engineering and Power Technology


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