基于DPSA方法的江都四站单机组优化运行

提出了考虑峰谷电价与水位变幅等因素的水泵叶片全调节与变频变速组合优化（以下简称组合优化）运行的动态规划数学模型,以日开机运行总耗电费用最小为目标函数,各时段水泵开机的叶片安放角和机组转速为决策变量,规定时段内抽水总量为约束条件,通过动态规划逐次逼近法（即DPSA）确定最优解.以江都四站为例,对单机组组合优化运行与定桨恒速运行进行了比较分析.结果表明,在典型潮位过程（12月至2月份平均潮位过程）,设计日均扬程（7.8~3.8 m）,机组以100%,80%和60%总水量（机组额定运行时的水量）作为约束时,组合运行优化结果与定桨恒速运行相比,考虑峰谷电价时可节省电费0.99%~35.00%,不考虑峰谷电价时可节省电费0.26%~17.23%.优化效果良好,为南水北调泵站优化运行提供了新的思路.

DPSA method-based optimal operation of single pump unit for Jiangdu No.4 Pumping Station

A DP mathematical model combined optimal operation with adjustable-blade and variable speed was presented.The peak-valley electricity prices and suction level fluctuation affected by tidal levels were taken in account in the model.The objective function was to take minimal electricity energy consumption cost of daily operation.The decision variables were the setting blade angle and rotational speed of pump unit in each time period and the constraint conditions were water volumes pumped in given times.The optimization method DPSA was applied to solve the optimal operation mode.One case was studied by 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 show that with the constraint conditions of typical tidal process which are average tidal levels from December to February of next year,designed average pumping head of 7.8 m~3.8 m,and the operation load at 100%,80%,60% of full-load（the water volume when the pumps working with the blade angle of 0 degree and the speed of 150 r/min in a full day）,the optimization effect of combination optimal operation with adjustable-blade and variable speed reaches 0.99%~35.00% compared with the operation in constant blade-angle and rotational speed.Without considering the peak-valley electricity prices,the number is 0.26%~17.23%,which gives a new way to the optimization of Eastern Route Project of South-to-North Water Diversion.