A method of inclusion of security constraints with distributed optimal power flow

In this paper, we propose that the SCOPF (Security Constrained Optimal Power Flow) be solved in a decentralized framework, consisting of regions, using a price-based mechanism. We first solve the distributed OPF problem to determine the maximum secure simultaneous transfer capability of each tie-line between adjacent regions by taking only the security constraints imposed on the tie-lines into account. And then, the regional SCOPF is performed using the conventional LP approach. A description of the inclusion of security constraints with the distributed OPF algorithm will be given, followed by a case study for the 3-region IEEE 24-Bus reliability test system.