Static voltage stability partition evaluation method for photovoltaic power generation grid-connected power system

The invention relates to a static voltage stability partition evaluation method for a photovoltaic power generation grid-connected power system, and the method comprises the following steps: S1, carrying out the modeling of a large-scale photovoltaic station: enabling the large-scale photovoltaic station to consist of a plurality of photovoltaic power generation units, and enabling the photovoltaic power generation units to be converged into a 10kV AC bus through several lines in the station, each alternating-current bus is composed of m photovoltaic power generation units, the high-voltage side of the transformer is a grid-connected point, the voltage is boosted to a 110kV bus through a main transformer with the transformation ratio of 121/10kV, and the 110kV bus is merged into a large power grid through a high-voltage alternating-current power transmission line; s2, establishing an element fault model of the power generation and transmission system; s3, analyzing voltage stability; s4, analyzing the influen