调水工程中相邻梯级泵站的开启时间差研究

Study on opening time difference of the adjacent multi-stages pump stations in water transfer projects

为缓解水资源时空分布不均的供需矛盾,我国修建了许多梯级泵站调水工程。但对相邻梯级泵站开启时间的控制不当,会导致泵站站下水位低于最低运行水位,危及泵站的运行安全。为解决这一问题,本文通过建立梯级泵站级间区段的一维二维耦合数学模型,模拟不同调水工况下站下水位的变化,确定了科学合理的相邻梯级泵站开启时间差。应用此方法对南水北调东线下级湖段进行了研究,提出了不同工况下泵站开启的临界时间差和临界水位。基于年调水量和起调水位两个变量,利用Levenberg-Marquardt算法和Universal Global Optimization算法提出了临界时间差和临界水位的定量关系式,并以此作为梯级泵站开启的判定条件。研究成果可为南水北调东线工程的运行控制提供技术支持,对其他类似工程也有指导意义。

In order to alleviate the contradictory between supply and demand caused by the uneven spatial and temporal distribution of water resources,China has constructed a number of water transfer projects with multi-stages pump stations.If water level of the downstream pump station is below the minimum operating water level due to the improper control of the opening time of the adjacent multi-stages pump stations,it would endanger the safe operation of pump stations.To solve this problem,a 1D-2D coupled numerical model of inter-stage section between the adjacent multi-stages pump stations has been developed to simulate the water level variation in the downstream pump station under different water transfer conditions and ascertain the scientific and reasonable opening time difference of the adjacent multi-stages pump stations.Then a study on the Xiaji lake section of the eastern route of South-to-North Water Transfer Project was conducted by this research method,which proposed the critical opening time difference and the critical water level of opening the pump stations under different conditions.Based on two variables of annual pumped water and the regulated water level,the authors derived respectively the regress equation of the critical opening time difference and the critical water level by Levenberg-Marquardt Algorithm and Universal Global Optimization Algorithm,which could be regard as the decision condition to open the multi-stages pump stations.The research findings provide technical support for the operational control of the eastern route and other similar projects.