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Energies 2012, 5(9), 3248-3265; doi:10.3390/en5093248

A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

1
Power & Industrial System R&D Center, Hyosung Corporation, 74 Simin-daero, Dongan-gu, Anyang, Gyunggi-do 431-080, Korea
2
Department of Electrical Engineering, INHA University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Korea
3
Korea Electric Power Research Institute, 105 Munji-ro, Yuseong-gu, Daejeon 305-760, Korea
*
Author to whom correspondence should be addressed.
Received: 9 July 2012 / Revised: 13 August 2012 / Accepted: 20 August 2012 / Published: 30 August 2012
(This article belongs to the Special Issue Smart Grid and the Future Electrical Network)
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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 microgrid; protection coordination; protection device; distributed generation; fault current
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Jin, D.-G.; Choi, J.-C.; Won, D.-J.; Lee, H.-J.; Chae, W.-K.; Park, J.-S. A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids. Energies 2012, 5, 3248-3265.

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