Secure Under Frequency Load Shedding Scheme with Consideration of Rate of Change of Frequency

By increasing the number of severe frequency events in the network, which might lead to an islanding incident, the need for using an adaptive special protection scheme has been highlighted. In this paper, an efficient method for obtaining the optimal values of under frequency load shedding (UFLS) relay settings is presented to minimize the amount of load removal and maintain network security. In this method, the rate of change of frequency (ROCOF) is used as a decent criterion for detecting the severity of the incident and optimizing the relay's adjustable parameters. Finally, this model has been studied and evaluated in a test system.