This paper presents an extension of an Newton OPF program, which has been developed under the sponsorship of EPRI, and its application to on-line dynamic ELD problem. In the first place, the formulation of a fast Newton OPF in both coupled and decoupled versions is described. Then, developed programs in both the versions are applied to example systems including a 344 node system and results are promising. Secondary, a countermeasure is given to improve the convergence characteristics of the decoupled OPF program.
Finally, the developed Newton OPF program is integrated into the on-line dynamic ELD of thermal units in order to take into account both generation rate constraints (GRC) and security constraints. That is, the feasible regions taking into account GRC are computed by the method developed by one of the authors and the fast Newton OPF is utilized to generate economic and secure dispatching command. The effectiveness of our approach has been verified by numerical simulations on the IEEE 30 node system.