Should environmental constraints be considered in linear programming based water value calculators?

•Environmental constraints in common water value tools increase calculation time.•The use of those water values is not always profitable.•The fewer the number of turbines, the greater the likelihood of that profitability. We evaluate the practical usefulness of incorporating maximum ramping rates an...

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Published inInternational journal of electrical power & energy systems Vol. 117; p. 105662
Main Authors Guisández, Ignacio, Pérez-Díaz, Juan Ignacio, Nowak, Wolfgang, Haas, Jannik
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2020
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ISSN0142-0615
1879-3517
DOI10.1016/j.ijepes.2019.105662

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Abstract •Environmental constraints in common water value tools increase calculation time.•The use of those water values is not always profitable.•The fewer the number of turbines, the greater the likelihood of that profitability. We evaluate the practical usefulness of incorporating maximum ramping rates and minimum environmental flows into a linear programming based water value calculator for hydropower plants that participate in the day-ahead electricity market. The methodology consists of three steps: first computing the water value once with and once without environmental constraints, then simulating the plant operations using each water value, and finally comparing the simulation profits. A set of nine representative hydropower plants formed by combinations of three real locations (in Colombia, Norway and Spain) and three turbine configurations (from one to three Francis units) are individually analyzed. Each plant is simulated in two synthetic 10-year long series subject to fifteen combinations of maximum ramping rates and minimum flows with the two above-mentioned water values, totaling 540 simulations. The results indicate that incorporating the analyzed environmental constraints into a linear programming based water value calculator can be significantly profitable only when the hydropower plants have only one or at most two turbines.
AbstractList •Environmental constraints in common water value tools increase calculation time.•The use of those water values is not always profitable.•The fewer the number of turbines, the greater the likelihood of that profitability. We evaluate the practical usefulness of incorporating maximum ramping rates and minimum environmental flows into a linear programming based water value calculator for hydropower plants that participate in the day-ahead electricity market. The methodology consists of three steps: first computing the water value once with and once without environmental constraints, then simulating the plant operations using each water value, and finally comparing the simulation profits. A set of nine representative hydropower plants formed by combinations of three real locations (in Colombia, Norway and Spain) and three turbine configurations (from one to three Francis units) are individually analyzed. Each plant is simulated in two synthetic 10-year long series subject to fifteen combinations of maximum ramping rates and minimum flows with the two above-mentioned water values, totaling 540 simulations. The results indicate that incorporating the analyzed environmental constraints into a linear programming based water value calculator can be significantly profitable only when the hydropower plants have only one or at most two turbines.
ArticleNumber 105662
Author Nowak, Wolfgang
Haas, Jannik
Guisández, Ignacio
Pérez-Díaz, Juan Ignacio
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Keywords Stochastic dynamic programming
Linear programming
Maximum ramping rate
Minimum environmental flow
Mixed integer linear programming
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Snippet •Environmental constraints in common water value tools increase calculation time.•The use of those water values is not always profitable.•The fewer the number...
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StartPage 105662
SubjectTerms Linear programming
Maximum ramping rate
Minimum environmental flow
Mixed integer linear programming
Stochastic dynamic programming
Title Should environmental constraints be considered in linear programming based water value calculators?
URI https://dx.doi.org/10.1016/j.ijepes.2019.105662
Volume 117
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