Abstract
This paper presents a high-gain DC-DC converter for a rooftop solar photovoltaic (SPV) system with a multifunctional grid-tied inverter. In order to achieve a smooth integration of roof-top SPV with the utility grid, a high gain DCDC converter is required to boost up to a higher voltage gain, to reduce ripple voltage, and switching stress at the DC bus. Further, this higher gain DC voltage is converted into a three-phase AC voltage of the demanded utility grid by a multifunctionality grid-tied inverter (MFGTI). Hence for integrating the SPV with the utility grid, there are challenges to overcome, such as keeping the grid synchronized, and power quality issues under nonlinear load, & solar irradiation conditions. A modified synchronous reference frame (SRF) control technique is proposed to make the MFGTI capable to inject the active power from SPV into the utility grid. Simultaneously compensate the reactive power, and the current harmonics to improve the PF within the IEEE standard 519-2022. The proposed system is implemented using MATLAB®/Simulink software, and it is evaluated under various solar irradiation, and nonlinear load conditions.