2步法改善长距离渠系结冰盖期的水力响应

Improvement of hydraulic behaviors of long distance canal system during ice cover formation by two steps method

针对长距离渠系结冰盖期控制仿真模型中,在采用普通PID控制器和下游常水位运行时水位、流量波动幅度和变化率大的问题,提出了2步法的闸门控制运行方法.该方法利用了变步长步进式控制法和改进的PID控制器的优点,分离了结冰盖期冰盖糙率和控制器对渠系水力响应的影响,使用该方法对南水北调中线工程总干渠京石段进行模拟,结果表明此方法明显减小了渠系结冰盖期的水位流量波动幅度和变化率,有利于渠系冬季冰盖生成的稳定性和避免发生冰灾.

A two steps PID （proportronal-integral-ditterentral） controller operation method was de- rived to improve the water level response during the ice cover formation, which separated the influence of ice cover roughness and controller on canal system hydraulic response and used step controller and improved PIp controller. According to the simulation of the Jingshi canal system parts, located in the middle line of the project for transferring Southern water to the North, the results show that the two steps PID control method reduces the water level differences and change rate obviously.