Multi-disaster power distribution network elasticity evaluation method considering fault linkage

The invention discloses a multi-disaster power distribution network elasticity evaluation method considering fault linkage. The method comprises the following steps: S1, modeling a plurality of disaster characteristic fault rates; S2, on the basis of sequential Monte Carlo simulation, reserving time sequence characteristics of elements in the disaster process, and establishing an element operation state model composed of a basic range fault rate and a characteristic fault rate; s3, analyzing the nonlinear correlation degree of the equal trend state representation quantity sequences of the lines and the nodes under the N-1 and N-2 scene sets through a grey theory, and establishing a coupling relationship between fault scenes; s4, establishing an LLD index, an SEDT index and an economic index which comprehensively consider the load loss degree and the maximum frequency change rate at the initial moment of active unbalance, forming a weighted elasticity-economic space evaluation system, and performing elasticity