Under frequency islanding scheme of Atomic Power Plant

This paper describes under frequency based islanding scheme of the Rawatbhatta Atomic Power Plant (RAPP) situated in Rajasthan. The islanding power system consists of seven generators having total 780 MW generation capacity. On the basis of simulation studies, under frequency based islanding scheme have been designed. Under frequency based islanding relays are placed at interconnecting points. Further under frequency based load shedding relays are also placed in the island to control the island frequency in the event of generation and load imbalance. Simulation results are presented up to 10% overload of Island. Simulation studies have been carried out using Mi-Power software. Frequency response of Islanded System, generators active & reactive power output, generators terminal voltage, response of governors & AVRs have been plotted. Simulation studies indicate that with proper setting of under frequency load shedding relays Island is successfully formed and stabilized at acceptable frequency.