OPERATING OF BACKUP PV PLANT UNDER CONSUMERS OUTAGES FROM ELECTRIC GRID

• Date: 2025
• Main Authors: Gaevskii, О., Budko , V., Doroshenko , O., Budko , M.
• Format: Article
• Language: Ukrainian
• Published: Institute of Renewable Energy National Academy of Sciences of Ukraine 2025
• Subjects: backup PV plant; grid disconnection; outage density; energy balance; power flows; PV module array; battery energy storage system; state of charge; nominal capacity; charging power.
• Online Access: https://ve.org.ua/index.php/journal/article/view/581
• Journal Title: Vidnovluvana energetika

The operation of a grid-connected photovoltaic (PV) plant under periodic grid outages, when the sys-tem functions as a backup power source, has been investigated. The capability to support the load de-pends on the daily energy deficit determined by the balance between generation, consumption, and the discharge of the battery energy storage system (BESS). This deficit is typically compensated by the grid, but its ability to supply energy is limited by the duration and frequency of daily power interruptions, char-acterized by the outage density (OD) parameter. Based on monitoring data, a linear relationship between the energy deficit covered by the grid and the outage density has been established. Using the daily energy balance equations that describe energy exchange between the system components (PV modules, BESS, load) and the grid, the dependence of the required BESS capacity on OD was obtained for various battery charging power levels. It is shown that as OD increases, the required battery capacity must grow following an approximately exponential dependence. To optimize BESS capacity selection, a procedure is proposed to configure a reliable power supply for consumers under various outage conditions by adjusting the bat-tery charging process. A family of control characteristics was obtained, representing the dependence of charging power on OD for batteries with different nominal energies.