EQUIVALENT OPTIMIZATION MODEL FOR LOSS MINIMIZATION - A SUITABLE ANALYSIS APPROACH

Any OPF tool used in on-line minimum loss calculation requires an accu rate representation of the external or unobservable parts of the netwo rk. This paper proposes an optimization model of both internal and ext ernal network represented explicitly. Although requiring only external network data, any available information about the external state may be used to improve its response. A general methodology for the perform ance analysis of Equivalent OPF models is also proposed. On one lever, the robustness of equivalent models for the production of accurate co ntrol actions in the internal system is analyzed. Accurate control act ions are those that are as close as possible to the controls obtained through a hypothetical OPF solution of the complete system. On a secon d level, the capacity to react accurately, when such control actions a re set in the internal system, is investigated. The proposed model and the Extended Ward equivalent have been tested through the presented m ethodology. The proposed model has been capable to take into account-t he information related to the optimization ''status'' (under optimizat ion or not) of external system. This is an important information since it affects considerably the internal control action calculation. This information can not be incorporated in the reduced equivalent models. Computational test results with the Brazilian South-Southeast 810 bus rear system are presented.