Detecting and preventing islanding of distributed generators in an electric power system is required to reduce the hazards and risks of damage to equipment and injury to personnel. This thesis will develop a new approach to islanding detection based on computing the frequency dependent impedance at the point of common coupling. To this aim, a frequency dependent model is developed to characterize the change in the circuit interconnection topology when islanding occurs. This approach is used as a basis for selecting features from impedance that distinguish islanding from normal operation. The method is investigated by simulation and the results is verified using an experiment on an inverter-less system. This approach can reduce the non-detection zone and detects the island.
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