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

Abstract

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.