考虑回水效应的一库多级式水电站群短期优化调度模型
A Short-Term Optimal Scheduling Model of Cascaded Hydropower Stations with One Reservoir Considering the Effect of Backwater

DOI: 10.12677/JWRR.2019.83030, PP. 248-259

Keywords: 一库多级，回水效应，混合整数线性规划
Cascaded Hydropower Stations with One Reservoir, Backwater, MILP

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Abstract:

“一库多级”梯级水电站间水力联系紧密，下库易产生回水对上库尾水位形成顶托作用，影响发电效率及计划安排。本文以机组为基本调度单元，提出了考虑回水效应的“一库多级”式水电站群短期优化调度模型，通过对下游库水位进行区间划分，将尾水位–泄量–库水位三维曲线描述为三种典型情境，采用分段线性方法实现了线性描述，最终将原问题转换为混合整数线性规划模型，并利用商用软件Lingo进行求解。经红水河干流天生桥梯级水电站群实例验证，提出的模型可在充分考虑回水影响下实现水电站群的精细化计算，有效提高梯级水电站群的发电量。
The hydraulic coupling among cascaded hydropower stations with one reservoir is close, and the backwater from the downstream reservoir is easy to form a jacking effect on the tailwater level of the upstream reservoir, which affects the generation efficiency and planning. Based on the unit of the basic dispatching unit, this paper puts forward a short-term optimal scheduling model of cascaded hydropower stations with one reservoir, which takes the effect of backwater into consideration. Through the interval division of the downstream reservoir water level, the three-dimensional curve of tailwater level-discharge-reservoir water level is described as three typical scenarios, and the linear description is realized by piecewise linear method. The developed model converts into a mixed integer linear programming model, which can be solved by commercial software Lingo. Based on a case study with Tianshengqiao cascaded hydropower stations located in Hongshui River, the study shows that the proposed model considering backwater effect can realize the refined calculation and improve the economic benefits of scheduling.

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