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Optimal Power Flow Analysis Considering Ramp Rate Limits of Generators

A.Pizano-Martínez, J.M.Lozano-García, E.A.Zamora-Cárdenas, H.J.Estrada-García

This paper presents the extension of a conventional Optimal Power Flow (OPF) model to include the ramp rate limits of generators. The computational implementation of this model is carried out on the platform provided by the Matlab® optimization toolbox. The solution of the extended model allows verifying if the electric demand curve, for a given period of time, can be supplied at the minimum generation cost without violating the ramp rate limits and ratings of generators, as well as the electric network constraints. At the same time, the solution also reveals the nodal voltage profile of the whole electric network for the given electric demand curve. TheIEEE 3-machine 9-bus test system is considered to show numerical results.