南水北调中线渠首前馈控制方案快速计算分析

Fast Calculation and Analysis of Feed Forward Control Scheme for Middle Route of South-to-North Water Transfer

明渠调水工程中为适时适量的满足下游用水需求,需要提前制定控制方案。前馈控制方案的设计往往较为复杂,且影响因素众多,调度人员难以快速做出决策。基于蓄量补偿法对南水北调中线工程刁河节制闸至十二里河节制闸段作前馈控制,基于蓄量补偿计算结果,分析了初始流量、分水流量与前馈控制时间的关系,构建了单、双变量的前馈控制时间快速计算公式。探究了不同因素对蓄量补偿控制下游水位偏差的影响,得到初始流量、分水流量与下游水位最大偏差之间的函数关系式。针对工程运行中的极端工况,原蓄量补偿控制的下游水位偏差过大的问题,采用二次蓄量补偿规则对渠池进行前馈控制,有效减小了下游水位偏差。

In order to meet the downstream water demand in the open channel water transfer project,this paper considers it necessary to formulate the control scheme in advance.The design of feed forward control scheme is often complicated,and there are many influencing factors,which make it difficult for dispatchers to make decisions quickly.Based on the storage compensation method,this paper applies feed forward control to the section from Diaohe control gate to Jialihe control gate of the middle route of South-to-North Water Transfer Project.Based on the calculation results of storage compensation,the relationship between the initial flow,water diversion flow and feed forward control time is analyzed,and a fast calculation formula of feed forward control time with single and double variables is established.The influence of different factors on the downstream water level deviation of storage compensation control is explored,and the functional relationship between the initial flow,water diversion flow and the maximum deviation of the downstream water level is obtained.In order to solve the problem that the deviation of the downstream water level under the original storage compensation control is too large in the extreme working condition of engineering operation,the feed forward control of the channel pool is carried out by using the secondary storage compensation rule,which effectively reduces the downstream water level deviation.