城市原水系统水质水量控制耦合模型研究

Study on the coupling model for water quality and quantity control in the urban raw water system

针对如何从水质水量两方面提高我国大中型城市原水系统供水安全保障的问题,从原水系统水质水量联合调度出发,采用大系统分散控制形式,在传统水质水量耦合模型研究基础上,增加了以3条信息传递通道(信息输入通道、信息反馈通道、控制信息输出通道)和1个策略分析器(水库的水质调控策略分析器)为主要元素的水质-水量反馈机制,构建了集水量优化调度、水质仿真模拟和水质调控策略分析于一体的城市原水系统水质水量控制耦合模型。模型采用闭环模式的反馈迭代计算,以利于充分发挥水质模拟结果对水量调度决策的指导作用,并提出了基于有向图广度优先和深度优先混合遍历技术的网络迭代求解方法。实例应用表明:通过定性控制系统的自动调控,利用水库群对污染物的稀释、净化能力可以快速改善受污染水库的水质,验证了本文模型的可行性和有效性。

To improve water supply security better in terms of water quality and quantity in the raw water system in large and medium-scale cities, a decentralized control of large-scale system is adopted in the joint dispatch of water quality and quantity in raw water system. Based on traditional coupling model of water quality and quantity, a water quality and water quantity feedback mechanism with three information transmission channels （information input channel, the feedback channel, control information output channel） and a strategy analyzer （reservoir water quality control） as the main elements is added. Integrating optimal operation of water quantity, water quality simulation and strategy analysis of water quality control, a water quality and quantity control coupling model for urban raw water system is established. A feedback iterative calculation of closed-loop mode is adopted in order to give full play of the directive function of water quality simulation results to water operation decision-making. Meanwhile, network iteration solving method is proposed based on the mix traversing technology of breadth-first search and depth-first search. The model is applied the raw water operation system in Shenzhen city and shows that automatic controlling through qualitative control system is able to improve water quality in polluted reservoir in a fast speed with the help of the dilution and purification effect of reservoir group to pollutants. The application proves the model proposed in this paper feasible and effective, offering a new method to improve raw water quality supply security.