In this paper Islanding detection methods for distributed resources are reviewed. The mainly used islanding detection techniques may be classified as active and passive techniques. Passive techniques don’t perturb the system but they have larger nondetection zones, whereas active techniques have smaller nondetection zones but they perturb the system. In this paper a new hybrid method is proposed for detecting islanding of inverter based distributed generators. This method is a combination of active frequency drift method and change in proportional power spectral density. Active frequency drift method is very effective in finding islanding with various modifications. Its drawbacks are overcome by change in proportional power spectral density method.
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