Method and device for evaluating credibility of voltage support strength of power system

The invention discloses a credibility evaluation method and device for voltage support strength of a power system. The method comprises the following steps: acquiring real-time measurement data of a to-be-measured power system, inputting the real-time measurement data into a pre-trained critical short-circuit ratio prediction model based on a multi-gating hybrid expert network, and outputting a first critical short-circuit ratio interval; optimizing the first critical short-circuit ratio interval according to a preset inequality constraint by using a Bayesian algorithm, and determining a second critical short-circuit ratio interval; according to a preset prediction attribute selection rule, determining a critical short-circuit ratio prediction value of the to-be-tested power system from the second critical short-circuit ratio interval; and calculating the real-time new energy multi-station short-circuit ratio of the to-be-tested power system, and making a difference between the real-time new energy multi-stat