Control of multiple distributed generators for intentional islanding

Due to safety concerns and the risks associated with an islanded system, current legislation has prohibited the islanded operation of distributed generation. However, operation of a temporary island may be a useful support to the main supply. In particular, in the event of an upstream supply outage, the temporary islanding operation of distributed generator (DG) can provide local supplies to critical customers, thus reducing customers´ outage cost and improve the power system reliability. Despite all the benefits that an islanding operation can provide to the power system, there are still many challenges and technical issues regarding its implementation that constrain its operation. The aim of this work is to look into two main challenges associated with temporary islanding operation: frequency regulation and generator control. Several simulation based studies carried out using PSCAD/EMTDC are presented.