Coordination Return of Protective Devices in Distribution Systems in Presence of Distributed Generation

With the presence of distributed generation (DG) units in distribution systems, its function is generally going to be changed. These systems deeply effects on distribution systems protection. A method to decrease DG effects on distribution systems protection is re-coordination of protective devices. To prevent high cost, the system configuration should be change to decrease the effect of DG sources when a fault occurs. One of the suggested methods to do that is the use of fault current limiter (FCL). A sample ring network at DIgSILENT is simulated in this paper. An overview to protective devices and their protective coordination will be presented. Then an optimal protective coordination would be created by utilization of FCL in presence of DG.