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The use of distributed generation resources, in addition to considerablebenefits, causes some problems in the power system. One of the most criticalproblems in the case of disruption is increasing short-circuit current level ingrids, which leads to change the protection devices settings in the downstreamand upstream grid. By using fault current limiters (FCL), short-circuitcurrents in grids with distributed generation can be reduced to acceptablelevels, so there is no needed to change the protection relays settings of thedownstream grid (including distributed generations). However, by locating theFCL in the tie-feeder, the downstream grid is not more effective than theupstream grid and thus its reliability indices also will be changed. Therefore,this paper shows that by locating the unidirectional fault current limiter(UFCL) in the tie-feeder, the necessity of changing in the relay protectionsettings of upstream grids is prevented. In this paper, the proposed method isimplemented, and its efficiency is reported in six scenarios.

Mitigating the Impact of Distributed Generations on Relay Coordination Using Fault Current Limiters