Safety and stability control system modeling method in power system dynamic simulation

The invention relates to a safety and stability control system modeling method in power system dynamic simulation. The method comprises the following steps of: performing hierarchical modeling on the safety and stability control system in a hierarchical decomposition mode; simulating an operation mode, fault information and a control strategy by adopting a ladder logic diagram to obtain a main station model and a sub-station model; and connecting a safety and stability control system model and a primary system model to realize the close-loop dynamic simulation of a large-scale power system which contains the safety and stability control system model. By the method, various different action behaviors and control characteristics of the safety and stability control system in the large-scale power system can be simulated accurately; the defects that conventional simulation software cannot reflect the action behaviors of the safety and stability control system are overcome; postmortem analysis of complex and severe accidents can be performed; and the requirements of the large-scale power system dynamic simulation on the simulation of the safety and stability control system can be met.