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Post outage MW line flows and voltage magnitude calculations are one of the most important steps of power system static security analysis. Most of the methods use linear models for the sake of simplicity. However, linear models may suffer from high errors especially for reactive power flows. This paper presents a new method to minimize the errors resulting from the linear system model implementation. The proposed method uses a bounded nonlinear optimization, which can be considered as the corrector of the linearized feedforward calculations.

This paper presents improved voltage and reactive power distribution factors, calculated by genetic algorithms. Deficiencies of the traditional sensitivity based linear methods are first overcome by constructing a bounded optimization procedure between the reactive power flows and the voltage magnitudes. This optimization problem is later solved by using genetic algorithms. The accuracy of the calculated post-outage voltage magnitudes and reactive power flows was tested on IEEE 14-Bus and IEEE 57-bus test systems.

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