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Modular algorithms for computing Intervals of Secure Power Injection

New market tools and distributed energy sources in present day transmission systems necessitate innovation in supporting information technologies. Existing tools used for power system operation evaluate individual power system snapshots but do not fully consider nearby regions in the operating space. Such tools may lead to market transactions, preventive actions, or corrective actions that are nominally efficient but poor in general. The Intervals of Secure Power Injection (ISI) method provides an alternative set based approach. Herein the ISI method is reformulated to allow fast recomputation of the interval sets under marginal changes in network topology. This method can be potentially applied in short term reconfiguration planning and in contingency analysis. Computation efficiency of proposed modular algorithms was tested on IEEE and real transmission system models.