反推水库入库流量的优化修正方法研究

Study on Optimization Correction Method for Reverse Reservoir Inflow

针对直接反推入库流量过程中的“锯齿形”不合理问题,基于监测水位值不能准确反映水库实际蓄水量这一主要原因,提出一种反推水库入库流量过程的优化修正方法。通过设定允许的水位修正幅度,以入库流量变幅最小为目标,建立优化修正模型,采用混合整数规划方法求解。以三峡水库出库流量数据为例,对直接反推的入库流量分别采用五点三次平滑方法、七点滑动平滑方法和优化修正方法进行平滑处理,通过平滑度和水位偏差两个指标比较这3种方法的优劣。算例分析表明,优化修正方法在保证平滑度的同时,对水位的修正幅度更小,更尊重水位监测事实,有很好的实际应用价值。

This paper proposes an optimization correction method for reverse reservoir inflow based on the main reason that the monitored water level value cannot accurately reflect the actual water storage volume of the reservoir,in response to the unreasonable fluctuation problem of the inflow by water balance.The optimization correction model is established by setting the allowable water level correction amplitude and taking the minimum variation of inflow as the target,and the model is solved by mixed integer programming.Taking the Three Gorges Reservoir outflow data as examples,the inflow process by water balance is smoothed by the five-point three times smoothing method,the seven-point moving smoothing method and the optimization correction method,respectively.The advantages and disadvantages of the three methods are compared by the indicators of smoothing degree and water level deviation.Case studies show that the optimization correction method guarantees smoothness while the correction amplitude of the water level is smaller,which is more respectful of the water level monitoring facts and has good practical application value.