Security enhancement using an optimal switching power flow

A method is presented which allows the determination of the optimal and n-1 secure system state by switching operations. A linear switching model is applied in an active way to model control actions and in a more passive way to set up contingency constraints. Using the switching model in a dual role permits the integration of contingencies and control actions into one optimization algorithm. Thus, with exactly one optimization step the power system can be improved considering various security levels. Preventive conservative and postcontingency rescheduling are differentiated. The performance of the algorithm developed is shown in a test case.<>