Abstract:The power grid stability control system, as an important protection measure for the entire power system, can avoid power grid failures resulting in large-scale power outages, and is an important defense line to ensure the safe and stable operation of power grid. Firstly, the situation of new energy construction project in Bijie is analyzed. Secondly, based on the grid structure of its regional power grid in 2023, a detailed stability calculation is carried out for AC system of power grid in this region, and the stability problems and weak links of the system are analyzed. Finally, measures and suggestions are proposed to improve the transmission ability of new energy in Bijie for different AC line faults, which provides guarantees for the safe operation of regional power grid.