基于分时电价的梯级泵站输水系统日优化运行

为了提高梯级泵站输水系统日运行效益,通过分析梯级泵站输水系统,提出了梯级泵站输水系统整体运行效率的定义及表达式,分析了梯级泵站输水系统日运行费用的影响因素及优化机制.在此基础上,以日运行费用最小为目标,考虑分时电价,日输水总量,泵站进、出水池水位等约束条件,以时段流量分配、级间水位等因素为决策变量,建立了梯级泵站输水系统日运行费用优化模型、梯级泵站输水系统运行效率优化模型和单级泵站运行效率优化模型,采用基于区间离散的动态规划法进行求解,进而确定梯级泵站输水系统日优化运行方案,包括各时段内梯级间水力(水位、流量)方案和各泵站内运行方案.将该优化方法应用于南水北调东线韩庄运河段梯级泵站工程,结果表明节约费用效果较为显著.

Optimization of cost per day of cascade pumping station water-delivery system

In order to improve the daily operation efficiency of cascade pumping station, through analyzing the cascade pumping station water delivery operation system, the concept and expression of the pumping station operation efficiency was proposed; and the influencing factors of daily operation costs and optimizing mechanism was analyzed. Based on the above researches, aiming at minimizing the daily operation costs, taking restricting conditions, such as time-of-use electricity price, water amount, and water level of intake and outlet pools, into consideration, a daily operation cost optimization model for cascade pumping station water delivery operation system, an efficiency optimization model of cascade pumping station water delivery operation system and an efficiency optimization model of single grade pumping station were established. Based on discrete intervals, adopting dynamic programming method, a daily economic optimization operation scheme for cascade pumping station water delivery system was determined, including inter-stage hydraulic(water level, water flow)plans and internal operation plans for all pumping stations. This method was applied to the optimization of Hanzhuang cascade pumping station water delivery system, which had greatly reduced the costs.