明渠调水工程闸前常水位运行控制解耦研究

Research on Decoupling of Constant Downstream Depth Operation of Canal

解耦是降低或消除渠道运行控制过程中渠池间相互影响的必要途径。对闸前常水位运行渠道的耦合作用进行了分析,对闸门开度输出解耦(Decoupler 1和Decoupler 2)和流量输出解耦方法的结构组成、解耦原理进行了分析。结合南水北调中线京石段渠道,采用非恒定流数值仿真的方式,对2种方法的解耦效果及解耦参数的选定进行了研究。结果表明,2类解耦方法都能有效降低渠道上下游方向的耦合影响,流量输出的方法在下游方向的解耦效果更好;解耦使系统的响应特性偏向敏感;解耦系数的选取直接影响系统的响应速度与振荡程度,建议通过仿真确定。

Decoupling is an necessary measure to reduce or remove the impact among individual pools.Interaction in constant downstream depth operation of canal is analyzed.Two decoupling methods,i.e.gate opening decoupler（Decoupler 1 and Decoupler 2） and flow decoupler are studied based on their structures and principles.And the two decoupling methods and their decoupler constants are examined by means of numerical simulation for the emergency sector of South-to-North Water Diversion Project from Shijiazhuang to Beijing.The simulation results show that the two decoupling methods can both reduce the upstream and downstream impact,and the flow decoupler perform better than that of gate opening decoupler.Decoupler makes the controller more aggressive.Decoupler constants influence response time and oscillation intensity of the canal pools,therefore,it＇s better to determine the decoupler constants by means of numerical simulation.