Risk quantification method, device and system of electric power information physical system

The invention provides a risk quantification method and device for an electric power information physical system and a risk quantification system, and the method comprises the steps: obtaining a target topological graph and a preset attack mode, and determining a plurality of first probabilities of each target node according to the preset attack mode and the target topological graph; determining a second probability of the target node according to an attack type of a preset attack mode; performing simulation according to a preset attack mode and the target topological graph to simulate performance loss of each target node in the preset attack mode to obtain an influence degree; and calculating the product of each first probability, the second probability and the influence degree to obtain a risk score, wherein the risk score is used for representing the threat level of the preset attack mode to the power grid. The method solves the problem that in the prior art, when risk assessment is carried out, qualitativ