False data injection attack defense method and system based on power system

The invention relates to the technical field of power information physical system network security, in particular to a false data injection attack defense method and system based on a power system. In the patent, aiming at the defense of false data injection attacks, node voltage amplitude and voltage phase angle measurement data tampered by hackers are detected and corrected under a state estimation service. Comprising the following steps: firstly, based on power grid simulation or historical data, constructing a network attack sample database containing node power, branch power, voltage amplitude and phase information of a power system; secondly, on the basis of the network attack sample database, constructing a node measurement data anomaly detector based on XGboost, and evaluating whether the node voltage amplitude and phase information are tampered or not; and finally, correcting the node voltage data subjected to the false data injection attack by adopting a PSO (Particle Swarm Optimization) method unti