Influence of the Maximum Flow Ramping Rates on the Water Value
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- 作者：I. Guisá ; ndez ; i.guisandez@upm.es" class="auth_mail" title="E-mail the corresponding author ; J.I. Pé ; rez-Dí ; az ; J.R. Wilhelmi
- 关键词：Maximum ramping rates ; Mixed integer linear programming ; Stochastic dynamic programming ; Water value
- 刊名：Energy Procedia
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：87
- 期：Complete
- 页码：100-107
- 全文大小：771 K
文摘
This paper presents a study on the influence of maximum ramping rates (ρ) on the water values of a real hydropower plant. For this purpose, a master-slave algorithm, based on stochastic dynamic programming (SDP) and mixed integer linear programming (MILP), is used. The master module, based on SDP, has a 1-year planning period with weekly time steps and considers 3 state variables: stored volume of water in the reservoir at the beginning of each week; weekly water inflow; and average weekly energy price. The slave module, based on MILP, has a 1-week planning period with hourly time steps and considers: maximum legal and minimum technical storage capacities; maximum and minimum technical stored volumes for power generation; maximum and minimum flows released through the hydro units, the bottom outlets and the spillways according to the stored volume; one different power-discharge piecewise linear non-concave curve, as a function of the initial and estimated final stored volumes; start-up and shut-down costs of the hydro units; wear and tear costs of the hydro units caused by power variations; hourly evaporation losses according to the stored volume; hourly water inflows and energy prices; and up and down ρ. The results indicate that the water values of the hydropower plant are very sensitive to the presence of ρ; especially during the months with low water inflows. Water values decrease quadratically when increasing ρ.