Abstract
ABSTRACT A new implementation of an LP algorithm for security-constrained preventive rescheduling of real power is described. Rescheduling of generation and load (if required) is used to maintain a secure condition by avoiding line overloads. A dual linear programming formulation of the optimal rescheduling is developed. The weighted minimum deviations in real power generations and loads are chosen as the objective function in the LP formulation. Inclusion of inequality constraints on active line flow limits and equality constraint on real power generation-load balance assures a solution representing a secure system. Transmission losses are also taken into account in the constraint function. Change in customer demands can be brought into the objective function. The line losses are also brought into the optimization in the form of an equality constraint. The algorithm has options to choose selected generators or loads to take part in the optimization. The proposed method is tested on four representative power systems. These tests show very encouraging results.
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