Abstract: With the advancement of the strategic goal of "carbon peaking and carbon neutrality", the favorable lighting geographical environment in the western region will attract a large number of distributed photovoltaic power stations. In this paper, the distributed photovoltaic absorption capacity of Xining area is calculated from two aspects of sub-county and sub-voltage level. By selecting typical photovoltaic power station for data analysis, proposed a voltage regulation strategy for grid operation. By using PSASP software for modeling, the impact of large-scale distributed power supply access on the short-circuit current of the system is calculated, further proposed suggestions on the safe operation of the power grid.