滇中引水二期工程伍庄村分水口衔接段水力响应及控制研究

Study on the Hydraulic Response and Control of the Connecting Section of Wuzhuang-village Turnout in the Phase-ⅡProject of the Central Yunnan Water Diversion Project

滇中引水二期工程中有压流段占比约为69.7%,为十分典型的复杂管-渠结合系统。如何对其进行自动化调控对于确保滇中引水整体工程发挥作用具有极其重要的意义。以伍庄村分水口衔接段作为研究对象,采用普莱斯曼窄缝法和有限差分法开发管-渠结合系统的一维非恒定流数值仿真平台,通过分析研究段在不利工况下的水力响应过程,优化当地流量控制器的基本控制参数配置。结果表明,管道压力阀门的控制方案对系统非恒定流水力响应影响较大,且表现出高度的非线性和耦合性。阀门控制间隔越短、阀门启闭速度越快,系统对不利工况的响应就越及时,综合控制性能越好,而阀门死区对控制效果的影响较为有限。经方案比选,建议选取死区为5 cm、最大启闭速度为0.5 m/min的压力阀门,相应阀门控制频率设置为10 min/次。研究成果及方法可为滇中引水二期工程其他干线衔接段或类似管-渠结合系统的水力控制提供参考。

The Phase-II Project of the Central Yunnan Water Diversion Project is a typical and rare complex pipe-canal combination system,in which the length of the pressure section accounts for about 69.7%.Automatic regulation is the key to ensuring the smooth deliveries of the whole diversion project.Taking the connecting section of Wuzhuang-village turnout as the study object,the one-dimensional unsteady flow numerical simulation platform of the pipe-canal combined system was developed based on the Preissmann Slot Method and Finite Difference Method.On the platform,the hydraulic response process of the study object under adverse scenarios was analyzed,and then the local flow controller`s parameters were optimized.The simulation results show that the control schemes of the pipeline pressure valve play a role of great significance and there is a high degree of nonlinearity and coupling.The shorter the valve control interval and the faster the valve speed,the more timely the system responds to the disturbance,and the better the comprehensive control performance,but the influence of the valve dead zone on the control effect is limited.After schemes comparison,it is recommended to adopt a pressure valve with a dead zone of 5 cm and a maximum opening and closing speed of 0.5 m/min.Moreover,the corresponding valve control frequency is set to 10 min/time.The research results and methods can provide references for the hydraulic automatic control of other connecting sections along the Phase-II Project of the Central Yunnan Water Diversion Project or other similar pipe-canal combined systems.