泵站单机组叶片调节与变频变速组合日运行优化方法研究

Study on optimal method of combination operation of adjustable blade with variable speed for single pump unit

本文提出了考虑峰谷电价与站下水位变幅的单机组叶片调节与变频变速组合日优化运行(以下简称为组合日优化运行)数学模型,以日开机运行总耗电费用最少为目标函数,1日24h划分的若干时段为阶段变量,各时段叶片安放角、水泵转速为决策变量,规定时段内抽水总量为约束条件。对该复杂系统最优化问题,提出了各时段叶片安放角正交试验选优、水泵转速动态规划模型优化的试验选优方法。对江都四站单机组组合日优化运行与叶片调节日优化运行、额定日运行进行了比较分析,结果表明,在扬程变幅范围内,不管是否考虑峰谷电价,从经济可行性的角度江都四站的改造中没有必要安装变频设备,不需考虑叶片调节与变频变速组合优化运行。

This paper proposes a mathe,matical model of optimal combination operation of adjustable blade with variable speed for a single pump unit in consideration of tidal levels and peak-valley electricity prices.In this model,we use an objective function to minimize the electricity cost of daily operation,adopt a stage variable to divide one day period into several periods and two decision variables of setting angle and pump speed for each period,and impose a constraint condition of pumping a certain volume in a given period.To optimize this complicated system,we put forward a method that optimizes the setting angle by orthogonal experiment and the pump speed by dynamic programming.Through a comparative analysis of combination operation,adjustable blade operation and variable speed operation of the Jiangdu No.4 pump station,we conclude that under the existing condition of head variation,whether or not the peak-valley electricity prices are considered,this station has no need of adopting the optimal combination operation,and thus no need of the frequency conversion equipments.