A new technique for evaluating the severity of branch outage contingencies based on two-parameter continuation

This paper presents a new and powerful two parameter (λ, μ) continuation technique for evaluating severe branch outage contingencies whether they correspond to saddle-node bifurcation points or breaking points, given a power system operating point, a load demand forecast and a generation dispatch forecast. The branch parameter μ is introduced in the new technique. Furthermore, this paper explores the relationship between branch parameter μ and the right eigenvector v associated with smallest eigenvalue. The technique has been tested on a large-scale power system with 19140 buses. With less than 3% relative error, the simulation results indicate that the proposed method is very robust, efficient and accurate for contingency evaluation of large-scale power systems.