Consideration of Control Strategy of DG Interface in Islanding System and Connected to Network Modes

Constant current and constant voltage- frequency (V-f) control strategies are important control strategies of DG interface that considered in islanding system and connected to network modes in this paper. Constant current control strategy is suitable in connected to network mode; because DG voltage and frequency are equal to voltage and frequency of network. Constant voltage-frequency (V-f) control strategy is suitable in islanding system mode. To evidence of above subject، different scenarios simulated in PSCAD/EMTDC software. These scenarios analyzed different control strategies to distinguish islanding and not to distinguish it.