Contingency analysis: feasibility identification and calculation algorithm

The paper presents a continuation- and optimisation-based algorithm to detect power-flow unfeasibility under the occurrence of a contingency hypothesis. In addition, the algorithm obtains the power-flow solution under a contingency hypothesis, if it exists, no matter how ill-conditioned the power system may be. The proposed algorithm is based on the parameterisation of both branch outages and generation dispatch of the generators selected for contingency evaluation, defining a contingency-convergence margin. The performance of the algorithm is illustrated by considering an highly loaded scenario of the operation of the Spanish power system.