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A fuzzy logic based controller for Loss of Mains detection

Islanding occurs when a part of the distribution system turns out to be electrically disconnected from the rest of the power system, yet keeps on being energized by DG associated with the subsystem. The IEEE 1547 Standard for Interconnecting Distributed Resources with Electric Power Systems directs that for avoiding islands in power systems the protection equipment's and measures must be in order. Even if islanding occurs the duration of the situation must be decreased as much as possible. In order to achieve this detection, various methodologies have been proposed. This work is based on the development of a passive islanding controller for Loss of Mains detection. The developed controller has been simulated using the MATLAB SIMULINK software package and comparison has been done with the ROCOF Relay and ROCOP Relay.