Secure operation of a power system requires not only that the system operates within specified system operating conditions, but also that proper operation is maintained when contingencies occur. Contingency analysis simulates credible contingencies to analyse their impact on the operation of the power system. In this chapter, a methodology is presented to speed up power flow calculations for branch outages in contingency analysis. This methodology can be used whenever power flow problems have to be solved that only differ slightly from each other. This includes other types of outages, Monte Carlo simulations, and optimisation problems.
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