Medium-term hydro-thermal coordination via hydro and thermal subsystem decomposition |
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Authors: | J Medina A Conejo F Pérez Thoden J González del Santo |
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Institution: | (1) Instituto de Investigación Tecnológica, Fernando el Católico 63 Duplicado, E-28015 Madrid, Spain;(2) Departamento de Ingeniería Eléctrica Escuela Técnica Superior de Ingenieros Industriales, Universidad de Málaga, Plaza de El Egido s/n, E-29013 Málaga, Spain;(3) Empresa Nacional de Electricidad (ENDESA), Príncipe de Vergara, 187, E-28002 Madrid, Spain |
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Abstract: | Summary This paper addresses the medium-term hydro-thermal coordination problem in an electric energy system. That is, the problem
of finding the energy production of every power plant (hydro or thermal) in every subperiod of a given planning period, so
that the customer load is supplied at minimum cost. The planning horizon is typically one to two months and the first week
of this planning period is modeled in detail.
The solution method proposed decomposes the problem in two subproblems corresponding to the hydro and thermal subsystems.
These two subproblems are coordinated using a coordinating function for every subperiod. The coordinating function of a given
subperiod expresses total production cost in that subperiod as a function of the total hydro production in that subperiod.
The decomposition proposed makes it possible to use specialized algorithms to solve the hydro and thermal subproblems. This
results in a very efficient computational procedure. From an experimental point of view the coordinating mechanism is robust.
A case study is provided. It considers 61 thermal plants, a hydro system including 8 cascaded hydro plants and a 48 subperiods
planning period. |
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Keywords: | Short-Term Hydro-Thermal Coordination Unit Commitment Hydro Scheduling Decomposition Linear Programming Relaxation |
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