The invention discloses a security constraint unit commitment efficient solving method and
system based on
neighborhood search, and relates to the technical field of power
system operation optimization, and the method comprises the steps: setting an initial iteration frequency, constructing a UC model without
network security constraint, and obtaining an initial UC solving result; according to a UC model solving result, safety checking is carried out on the
power transmission line, and a specific unit set is screened; building a
neighborhood search cutting plane based on a specific unit set, adding the
neighborhood search cutting plane into the UC model, and solving the UC model again; and after the UC model is solved again, iterative circulation is carried out, and the
unit operation state and the planned output are output. According to the method, the search space of the mixed
integer programming problem is effectively reduced, the invalid search range is reduced, the solving speed of the security constraint unit commitment problem is increased, the strict requirement of real-time scheduling of a power
system on the solving time can be met, and the method is suitable for large-scale popularization and application. The unit combination scheme obtained through efficient solution can realize optimization of the system operation cost, and the economic benefit of the power system is improved.