In the present day power systems are large and complex. With current rise in the demand of electrical energy, power systems will continue to grow both in size and complexity. Also, our dependence on electricity is so great that it is essential to have uninterrupted supply of electrical power within set limits of frequency and voltage levels. Contingency screening and ranking is one of the important components of on-line system security assessment which is done with the help of various computer software's which employ iterative methods like Newton Raphson and Fast Decouple load flow methods for obtaining the magnitudes of various parameters. Contingency analysis of a power system is a major activity in power system planning and operation.
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