Islanding detection for utility interconnection of multiple distributed generators

At present, islanding detection is one of the important research orientations in the area of distributed generation (DG). There exist currently in the literature several methods for islanding detection in the case of single distributed generator connected to a utility grid. These methods are classified as active, passive and methods installed on the utility. However, these methods have limitations or become ineffective in the case of multiple distributed generators connected to the same point of the utility grid because of the interferences between sources. In this paper, we present a robust islanding detection method based on the correlation technique. Analytical and simulation studies were performed in order to validate the accuracy of the method. The results showed that this method behaves well in the case of multiple distributed generators connected to the utility grid even in the critical situations i.e. when the power of the load is provided solely by the distributed generator.