A Hybrid Strategy for Distributed Generators Islanding Detection

Distributed generation is a form of electric power privatization. Consumers install their own power station to supply the local loads and/or share in the utility loads. Many protective problems have been developed due to the existence of these distributed generators. However, a protective strategy should be developed to protect the system and the generator itself from different hazards. One of the main protection problems is a generator islanding. Islanding means that the generator becomes in a standalone mode of operation when the utility circuit breaker opens due to either fault occurrence or maintenance. Many techniques of islanding protection are discussed and simulated to make a suitable strategy for the protection of distributed generator. This paper introduces a hybrid passive method for islanding detection to minimize the non-detective zone. This hybrid islanding detection strategy guarantees an accurate operation of the islanding protection relay.