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Optimal coordination of overcurrent relays in power systems for reliability assessment under the presence of distributed generation using ETAP

Ever increasing load demand has questioned power system planners and operators all over the globe for its reliable and efficient performance. Recently, integration of Distributed Generation (DG) in Distribution system finds higher penetration levels for catering most of the load demands. The impacts of DG units concern for voltage stability, frequency deviation and relay coordination and must be analysed effectively. This paper proposes a novel scheme on optimal relay coordination with reliability assessment under the presence of Wind Turbine Generators (WTGs). Optimal placement of WTG can be approximated by sensitivity indices (L-index). The coordination is carried out by graphical approach and by physical alteration of pick up value, Plug Setting Multiplier (PSM) and Time Dial Setting (TDS) and further reliability assessment is carried out. The proposed scheme is tested on ANSI Model system using ETAP. The results obtained are far more encouraging.