Hydrothermal Unit Commitment with Deterministic Optimization: Generation and Transmission Including Pumped Storage Units

ALVAREZ, GONZALO E.; MARCOVECCHIO, MARIAN G.; AGUIRRE, PIO ANTONIO

SADIO Electronic Journal of Informatic and Operation Research

SOCIEDAD ARGENTINA DE INFORMÁTICA E INVESTIGACIÓN OPERATIVA

Lugar: Buenos Aires; Año: 2018 vol. 17 p. 92 - 115

1514-6774

Abstract. This work presents a novel approach for solving the short-thermscheduling of hydro-thermal power generation, including pumped storage systemsand transmission constraints. The problem addressed is known as SecurityConstrained Unit Commitment (SCUC). Pumped Storage Units (PSUs) are importantin electric systems during the off-peak and the peak demand periods,providing economic and technical benefits. Linear aproximations are applied tononlinear equations of this kind of mathematical problems which are: fuel costfunctions, generation-discharge curves of PSUs and transmission constraintsmodeled with Alternating Current power flow model. Thus, MILP models arepresented for the problem addessed. To prove the efficiency of the proposedmodels, two systems with PSUs will be tested: a modified 6-bus and the IEEE31-bus power system. Results show that the proposed MILP models allow:modeling the SCUC problem more realistically, obtaining feasible solutionswithin efficient computational times, and reaching production cost savings upto almost 20% compared to power systems that lack capacities to pumping water.Several indicators obtained from results are presented through graphs, as atool for improving operation and maintenance of power systems. The analysisof these indicators and the graphic interpretation allow to identify and classifycritical parts of systems as well as to make recommendations about future systemimprovements.