中文摘要：

建立了考虑峰谷电价、长江潮汐变化的南水北调泵站站内多机组变速优化运行模型：在水泵设计叶片安放角不变的情况下,以站内机组耗电费用最少为目标函数,时段为阶段变量,水泵转速、开机机组台数为决策变量,日抽水量为约束条件。针对该复杂非线性规划模型,首次采用动态规划逐次逼近法进行求解,并以江都四站为例,对站内多机组变速与定桨恒速运行进行了比较分析。研究结果表明,无论是否考虑峰谷电价,满负荷运行时泵站变速优化效果不足以抵消变频器的损耗;但当扬程较低、提水负荷较小时,变速优化运行方效益仍较明显。

英文摘要：

A Nonlinear Programming Model（NPM） for the optimal day-operation of multi-units by adjusting speed in one pumping station has been put out,where the peak-valley electricity prices and tides influence of Yangtze River are considered.The model takes the minimal operation cost of pump units assembly as objective function.,the periods are defined as stage variables.The speed of pump units and the number of the working-pumps are expressed as decision variables,and the water volume pumped in one day as constraint condition.The problem is very difficult to be settled by conservational methods.The authors present the theory of dynamic programming with successive approximation to settle it at the first time.With applying the method to the optimal operation of Jiangdu No.4 pumping station,which is the source pump station of Eastern Route Project of South-to-North Water Diversion,and comparing the state of combination optimal operation with the operation in constant blade-angle and rotational speed of Jiangdu No.4 Pumping Station.the calculation results showed that If full load operation,regardless of considering peak-valley electricity prices or not,the benefits of variable speed operation is not enough to compensating the energy losses of the VFD.But when the load and delivery lift are low enough,the effect of adjusting speed is still in evidence.which gives a new way to the optimization of eastern route project of south-to-north water diversion.