Research voltage stability of photovoltaic power generation system

With a number of large centralized photovoltaic power plants connected to the grid. Junction photovoltaic power plants and power generation systems and power grid, which is the point of common coupling. Often due to the unstable output of photovoltaic power plants caused by abnormal voltage and outlets. So, PCC point becomes the measure of a grid system is stable and reliable vital sign. Generally, the photovoltaic system can be viewed as a nonlinear system unstable. This paper presents an improved version of the PV power plant and network voltage stability discrimination method. Simulation results show that the proposed method in practical application project. It has a good reliability and stability. PCC can be applied to large-scale testing actual weak point voltage PV plant.