Sizing of a battery energy storage system to minimize underfrecuency load shedding in island power systems

This paper presents a method to size battery energy storage systems (BESSs) to minimize underfrequency load shedding in island power systems. The proposed method depends on a simplified representation of the power system, where generating units are represented by firstorder systems. An analytical expression is derived to estimate the BESS size. The proposed method has been applied to two Spanish isolated power systems. Dynamic simulations with PSS/E software package confirm the proposed method to size BESS. BESS with a capacity around 6% to 9% of the installed generation capacity are needed to avoid load shedding.