A FLEXIBLE APPROACH TO SHORT-TERM HYDROTHERMAL COORDINATION .1. PROBLEM FORMULATION AND GENERAL-SOLUTION PROCEDURE

This paper presents a new flexible approach based on the Lagrangian re legation for solving the hydro-thermal coordination problem. Part I ad d Part II of this work make a complete theoretical and practical tool in order to solve this large scale, nonlinear, nonconvex, and dynamic problem. The final result is an efficient and proven programming packa ge within the operation planning needs. Part I deals with the general problem formulation, with the application of the decomposition techniq ue and with the primal problem solving. Methodological and modeling im provements are presented concerning costs of the excessive hydro produ ction and advancements in the primal problem solving. The numerical si mulations show flexibility of the proposed procedure which can be used to solve the short-term hydro-thermal coordination problem in complet ely different power systems.