Increasing the integration capabilities of photovoltaic generation in a small and isolated power system

The increasing photovoltaic generation (PV) in a small and isolated power system often has a negative impact on the primary frequency response. A previous work has shown, by means of a statistical analysis, that the risk of Under Frequency Load Shedding (UFLS), following a unit outage, increases as the PV installed capacity rises. In this work, a similar approach is used to quantify the potential benefits of including an additional resource, such as a centralized storage system, to contribute to the primary frequency regulation. The methodology is based on the sequential simulation of one year day-ahead scheduling, followed by a contingency analysis. It is observed that the reallocation of the primary reserve can improve the economic performance of the dispatch and increase the system´s PV integration capabilities. However, this might further reduce the system inertia. Hence, to effectively limit the UFLS risk, the requirement on the dynamic of the primary reserve deployment must be reviewed.