Security Enhanced Optimal Power Flow with Transmission Cost Solution

Power system security involves taking remedial action against possible network overloads due to contingencies. Security can be enhanced by redispatching generating units and by changing phase shifter settings. This paper presents a CMAES (Covariance Matrix Adapted Evolutionary Strategy) based OPF (Optimal Power Flow) algorithm for identifying optimal control variables to minimize operating cost while ensuring security. Operating cost includes generation cost and transmission cost under pre and post contingency cases. Overloading is alleviated by redispatching of generation alone. Severity index is added as constraint to the objective function to ensure overload alleviation. Transmission cost is calculated using power flow tracing method. Matrix based power flow tracing method is used to allocate transmission charges. IEEE 30 bus and IEEE 118 bus systems are used for simulation. Copyright (C) 2012 Praise Worthy Prize S.r.l. - All rights reserved.