Distributed power generation systems (DPGSs) require reliable islanding detection algorithms (passive or active) in order to determine the electrical grid status and operate the grid connection control system properly. This paper proposes a new islanding detection method for any possible network loading based on utilizing and combining various system parameter indices. In order to secure the detection of islanding, eight intentional disturbances are imposed to the system under study in which two sets of them simulate the islanding condition. The proposed technique uses the adaptive notch filters for extracting the frequency of oscillation of generator’s output waveform as one of the output parameter indices. An advantage of this technique is that it does not need to vary the islanding detection boundaries under various system loading conditions.
Key words: Islanding detection, distributed generator, adaptive notch filter.
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