A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

Dae-Geun Jin, Jong-Chan Choi, Dong-Jun Won, Hak-Ju Lee, Woo-Kyu Chae and Jung-Sung Park
Additional contact information
Dae-Geun Jin: Power & Industrial System R&D Center, Hyosung Corporation, 74 Simin-daero, Dongan-gu, Anyang, Gyunggi-do 431-080, Korea
Jong-Chan Choi: Department of Electrical Engineering, INHA University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Korea
Dong-Jun Won: Department of Electrical Engineering, INHA University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Korea
Hak-Ju Lee: Korea Electric Power Research Institute, 105 Munji-ro, Yuseong-gu, Daejeon 305-760, Korea
Woo-Kyu Chae: Korea Electric Power Research Institute, 105 Munji-ro, Yuseong-gu, Daejeon 305-760, Korea
Jung-Sung Park: Korea Electric Power Research Institute, 105 Munji-ro, Yuseong-gu, Daejeon 305-760, Korea

Energies, 2012, vol. 5, issue 9, 1-18

Abstract: In a conventional distribution system, protection algorithms are designed to operate on a unidirectional high fault-current level. In a microgrid, a fault current from distributed generation (DG) may bring about a relay malfunction because of the bidirectional and relatively small fault current. Therefore, the conventional protection scheme is not applicable to microgrids and a new protection method must be developed. In this paper, two protection coordination algorithms which can be applied for facility and secondary microgrids are proposed, respectively. The proposed protection algorithms eliminate faults not by the EMS signal but by directional relays. Moreover, this makes the algorithms flexible regardless of the types and numbers of DG. The proposed protection algorithms were simulated at the KEPCO RI Microgrid Demonstration Site.

Keywords: microgrid; protection coordination; protection device; distributed generation; fault current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2012
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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