Introducing more Distributed Generation (DG) into power grid infrastructuredrives more attention to understand how large scale DG affects grid operation.Islanding is an important concern in this area. Islanding refers to thecondition that DGs within a microgrid continue energizing while the microgridhas been disconnected from the main grid. Considering the adverse effects ofIslanding, it should be detected and managed in a proper way. After Islandinghas been detected, even though the first option is tripping all inverterbasedDG unit in the system, the system has this option to work as a stand-alonemicrogrid. For achieving this goal, the frequency of microgrid should beregulated. This paper proposes an islanding detection method based on currentdetection in a parallel arm with the fuse arm of the microgrid. After islandingdetection, this paper presents an effective implementation Demand Response (DR)to regulate the frequency in islanded microgrid as an Ancillary Service (AS)considering the transient constraints of frequency in inverterbasedgenerations.
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