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Multi-usage hydropower single dam management: chance-constrained optimization and stochastic viability

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Abstract

We consider the management of a single hydroelectric dam, subject to uncertain inflows and electricity prices and to a so-called “tourism constraint”: the water storage level must be high enough during the tourist season with high enough probability. We cast the problem in the stochastic optimal control framework: we search at each time t the optimal control as a function of the available information at t. We lay out two approaches. First, we formulate a chance-constrained stochastic optimal control problem: we maximize the expected gain while guaranteeing a minimum storage level with a minimal prescribed probability level. Dualizing the chance constraint by a multiplier, we propose an iterative algorithm alternating additive dynamic programming and update of the multiplier value “à la Uzawa”. Our numerical results reveal that the random gain is very dispersed around its expected value; in particular, low gain values have a relatively high probability to materialize. This is why, to put emphasis on these low values, we outline a second approach. We propose a so-called stochastic viability approach that focuses on jointly guaranteeing a minimum gain and a minimum storage level during the tourist season. We solve the corresponding problem by multiplicative dynamic programming. To conclude, we discuss and compare the two approaches.

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Notes

  1. Even if it was not the case in the data provided by Electricité de France.

  2. The abbreviation w.r.t. stands for “with respect to”.

  3. Whereas it would correspond to the Decision-Hazard framework if \( \mathbf {U}_{t} \) were measurable w.r.t. \( \sigma \left( \mathbf {W}_{0}, \, \ldots , \, \mathbf {W}_{t-1} \right) \) (see [7]).

  4. The abbreviation s.t. stands for “such that”.

  5. The gradient step method for the dual minimization problem may be replaced by a more efficient method such as dichotomy, conjugate gradient or quasi-Newton.

  6. Otherwise, the multiplier goes to infinity with the iteration index, which means that Constraint (9f) is infeasible.

  7. Although this assumption is by no means required.

  8. See Remark 2 for the influence of these discretization choices on the quality of the solution.

  9. We could consider that the set in which \( \mathbf {S}_{t} \) takes its values might vary with respect to t. This would certainly reduce the algorithm running time, but it would not reduce it by orders of magnitude.

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Acknowledgments

The authors thank Electricité de France Research and Development for initiating this research through the CIFRE PhD funding of Jean-Christophe Alais and for supplying us with data.

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Correspondence to Pierre Carpentier.

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Alais, JC., Carpentier, P. & De Lara, M. Multi-usage hydropower single dam management: chance-constrained optimization and stochastic viability. Energy Syst 8, 7–30 (2017). https://doi.org/10.1007/s12667-015-0174-4

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