泵站多机组变频变速调节运行优化研究

Study on optimization of multi-units operation of frequency conversion and speed regulating in pumping stations

南水北调工程是我国水资源调度分配的重大工程,而泵站则是该调水工程中不可或缺的重要部分。针对泵站多机组变频变速调节的问题,建立了多机组变频变速调节的日优化运行模型。以南水北调东线工程泵站——淮阴三站为例,考虑了峰谷电价,对站内变频变速调节的日优化运行开展研究,在研究过程中采用了改进的动态规划算法进行计算求解。在求解过程中,通过分析约束条件,剔除不符合要求的机组启停组合,从而减少了优化问题的维数,解决了"维数灾"问题。计算结果表明:与定角恒速运行相比,淮阴三站实施频率优化运行可节约运行费用3.5%;在高峰阶段,影响运行费用的主要因素是开机台数,在满足需求量的前提下,机组应优先选择停机状态;而在低谷阶段,机组应优先以单位提水能耗较高的方式运行,以减少在高峰阶段的提水量。

South-to-North Water Diversion Project is a major project of water resources dispatch and distribution in China,of which pumping station is an indispensable part.Aiming at the frequency conversion and speed regulation of multi-units operation in pumping station,we establish a mathematical model of optimal daily operation for pump station.Taking No.3 Huaiyin pumping station on East Route Project of South-to-North Water Diversion as a study case,with the consideration on peak and valley electricity prices,the optimal operation of frequency conversion and speed regulation of the pump station is studied by using improved dynamic programming algorithm.In the calculation,by analyzing the constraints,removing the starting-stopping combinations that do not meet the requirements,the dimensions of the optimization are reduced and the problem of“multidimensional disaster”is solved.The calculation results shows that the optimal operation of No.3 Huaiyin pumping station can save 3.5%costs comparing with the operation at fixed blade angle and constant speed.In the peak stage,the main factor influencing the operation cost is the number of units in working state,shutdown state of unit is preferred in the premise of meeting the demand.In the valley stage,the unit should run in a way of high energy consumption of per unit water lift to reduce the amount of water lift during peak stage.