Grid-connected photovoltaic systems were studied to improve efficiency and reduce harmonics. The researchers used MATLAB/Simulink to model the system and analyze synchronization with the grid. They focused on minimizing harmonics, optimizing system performance, and enhancing energy quality. Measurements showed voltage stabilization, power output, and frequency synchronization between the photovoltaic system and the grid. The study aimed to operate the system more efficiently and interpret the results for practical applications.