Hydrothermal Unit-Commitment Problem of a Large-Scale System with Representation of Forbidden Zones

Bruno Colonetti, Erlon Finardi and Lucas Borges Picarelli
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Bruno Colonetti: Department of Electrical and Electronic Engineering, Federal University of Santa Catarina, Florianopolis 88040-900, Brazil
Erlon Finardi: Department of Electrical and Electronic Engineering, Federal University of Santa Catarina, Florianopolis 88040-900, Brazil
Lucas Borges Picarelli: Norte Energia S.A., Brasilia 70390-025, Brazil

Energies, 2021, vol. 15, issue 1, 1-26

Abstract: As we move towards electrical networks with a growing presence of renewable generation, the representation of the electrical components becomes more important. In hydro-dominated power systems, modelling the forbidden zones of hydro plants becomes increasingly challenging as the number of plants increases. Such zones are ranges of generation that either should be avoided or are altogether unreachable. However, because representing the forbidden zones introduces a substantial computational burden, hydrothermal unit-commitment problems (HTUC) for large systems are usually formulated ignoring the forbidden zones. Nonetheless, this simplification may demand adjustments to the solution of the HTUC, because the generation of the hydro stations may fall in forbidden zones. In practice, the adjustments are usually performed based on the experience of system operators and, then, can be far from an optimal correction. In this paper, we study the impact of explicitly representing the hydro-generation forbidden zones in a large-scale system with more than 7000 buses, 10,000 lines, and 700 hydro units. Our findings show that the simplified model that is current used can deviate significantly from the model with forbidden zones, both in terms of the generation of hydro plants, as well as the generation of thermal plants and the system marginal costs.

Keywords: hydrothermal unit commitment; forbidden zone; power system modelling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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