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Transmission switching considering short-circuit current limitations

With the growing expansion of the power system, transmission network is now facing an increasingly serious threat of short-circuit current (SCC). This paper proposes an optimal transmission switching model considering both single-phase and three-phase SCC limitation constraints. In the model, both three-phase and single-phase SCC limitations are considered as constraints, which are formed in nonlinear formulation with sparse technology. The corresponding solution strategy is also proposed based on Benders decomposition. The mixed integer linear master problem is formed by linear relaxation of the SCC limitation constraints. The SCC violation caused by linearization error is then checked by the nonlinear subproblem. The optimal solution is obtained when the violation is diminished by iterations between master and subproblem. The applicability of the proposed model and solution method are assessed on IEEE 118-bus test system.