Optimal power flows of interconnected power systems

The work presented in this paper seeks to provide a theoretically sound, yet practical foundation for the implementation of inter-utilities power exchanges based on spot pricing. The proposed approach allows the operational independence of each utility. Using decomposition-coordination techniques, a multi-area optimal power flow problem is reformulated as a master problem and a set of area-OPF subproblems, each associated with one area. An interior-point/cutting-plane method is used to reduce the number of iterations in the numerical solution of the nondifferentiable master problem. The paper includes test results on IEEE-based systems.