The Research Review of the Stability of Grid-Connected Photovoltaic Generation System

The rapid development of large-scale photovoltaic power generation is an effective means to alleviate the energy crisis and saving haze. With the continuous expansion of photovoltaic grid-scale, grid access conditions are increasingly demanding. Given the inverter under different grid conditions, its parts are subject to a certain extent, and thus cause stability problems. This paper describes the influence of output filter, phase-locked loop (PLL), digital delay and weak grid on the stability of the grid-connected photovoltaic generation system, both from the inverter itself and connected grid.