Design and sensitivity analysis of underfrequency load-shedding schemes of isolated power systems based on frequency stability margin

The objective of this paper is to tune the parameters of an underfrequency load shedding (UFLS) scheme based on the frequency stability margin (FSM) and compare its performance with the conventional UFLS scheme. The performance is assessed by simulating the outage of generating units of a real isolated Spanish power system. The results of this study demonstrate that the introduction of the FSM in the UFLS scheme contributes to a significant improvement in its performance. Furthermore, a sensitivity analysis of the FSM-based UFLS scheme is presented, where the effect of varying design parameters and the frequency response to consecutive generator trippings are studied.