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

Author

Listed:
  • 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
    INESC P&D Brasil, Santos 11055-300, Brazil)

  • Lucas Borges Picarelli

    (Norte Energia S.A., Brasilia 70390-025, Brazil)

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.

Suggested Citation

  • Bruno Colonetti & Erlon Finardi & Lucas Borges Picarelli, 2021. "Hydrothermal Unit-Commitment Problem of a Large-Scale System with Representation of Forbidden Zones," Energies, MDPI, vol. 15(1), pages 1-26, December.
    • Handle: RePEc:gam:jeners:v:15:y:2021:i:1:p:39-:d:708109
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    References listed on IDEAS

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    1. George Liberopoulos & Panagiotis Andrianesis, 2016. "Critical Review of Pricing Schemes in Markets with Non-Convex Costs," Operations Research, INFORMS, vol. 64(1), pages 17-31, February.
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