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    MODELING AND CONTROL OF GRID-CONNECTED PV SYSTEM WITH LINEAR AND NON-LINEAR LOADS
    (2022-05) Muttaleb, Mustafa Hashim Muttaleb
    Rising fuel costs, aged equipment, continuing increase of energy consumption, and integrating renewable energy (RE) supplies into the grid are the most challenging issues that electric utilities face. In recent years, photovoltaic (PV) penetration into power grid particularly the low/medium voltage network has increased dramatically. In this regard, meeting the continuing worldwide energy demand with PV technology necessitates integrating technological features with PV systems that allow them to respond intelligently. In this study, medium-sized PV system rated at 100 kW connected to the utility grid is modeled and analyzed. The system is made up of four sub-arrays, each with a capacity of 25 kW. A non-isolated DC/DC boost converter was used in the simulated system, utilizing a maximum power point tracking (MPPT) algorithm to extract the PV panel's maximum productivity. To track the MPPT point, one of the most common techniques namely the incremental conductance (Inc-Cond) was used. In addition, a three-phase voltage source inverter system namely neutral point clamped (NPC), enabling the installed PV system to interact with the utility grid, was modeled. Both linear and non-linear loads were investigated. A phase-locked loop (PLL) was used to synchronize the solar PV inverter with the 60 Hz grid. The system was tested under various loading and irradiance conditions and the results demonstrated the effectiveness of the system to control the energy flow between the PV system, grid and the load. The modeled system was designed by using the MATLAB-Simulink environment.