Method for electric power system transient state successive instability mode search and relevance alternating current fracture surface identification

The invention discloses a method for electric power system transient state successive instability mode search and relevance alternating current fracture surface identification, and belongs to the technical field of electric power systems and automation technologies of the electric power systems. Based on a transient state safety and stability quantitative analysis theory and method, on the basis of influence, on a transient stability mode and transient stability margin after faults of a quantitative evaluation system net rack structure, electric generator enabling/disabling and generated output changes, a quantitative estimation method of the influence, on the transient stability margin after the preconceived faults, of load power and direct current system changes is provided, then a trigger fault set of the transient state successive instability mode search is screened out, and the electric power system transient state successive instability mode search and relevance alternating current fracture surface identification are carried out on each preconceived trigger fault. The method for the electric power system transient state successive instability mode search and the relevance alternating current fracture surface identification can provide technical support for rapid screening of large power grid transient stability preconceived faults and malignancy evolution of a defense alternating current-direct current parallel serial power grid transient stability mode, and keeps the power grid stable.