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This paper analyzes the effect of introducing an energy storage (ES) system in anintermittent renewable energy power plant such as a photovoltaic (PV) installation.The aim of this integration is to achieve an improvement in the operability of thesepower plants by increasing their production predictability. This will allow a further PVintegration within the electrical power system, facilitating the system’s load–demandbalance. In this manner, the paper proposes two power management strategies (PMSs),each with different configurations, for operating a PV power plant: the first focuses onfixing constant power production and the latter focuses on reducing the high frequencyfluctuations of the production. Thereafter, this paper analyzes and quantifies the ratingsof the ES system (ESS) required to ensure a reliable performance of the plant on anannual basis for each of the PMSs with their different possible configurations. Theresulting ES ratings vary with these PMS configurations. It can be concluded thatsignificant improvements in production predictability are achieved with an ESS energycapacity of approximately 50% of the average daily energy produced by the PV panelsand a power rating of around 55% of the plant’s rated power. All the results are basedon 1-year-long simulations which used real irradiance data sampled every 2min

Power management strategies and energy storage needs to increase the operability of photovoltaic plants