长距离明渠调水工程蓄量动态调节控制算法研究

Dynamic regulation algorithm of volumes for long distance water division canal

本文阐明了明渠渠池蓄量与节制闸闸前水位之间的单值对应关系,在此基础上提出一套通过动态调节渠池蓄量,实现闸前常水位运行的控制算法。该算法基于流量平衡和蓄量平衡关系推导,前馈控制与反馈控制相结合。前馈控制根据分水口计划主动调节各渠池蓄量,起粗调作用;反馈控制针对前馈控制过程出现的水位偏差,通过动态调节各渠池蓄量实时校正,起细调作用。该算法具有原理简单,参数率定简便,控制规则灵活,实用性强等特点。算法在南水北调东线工程胶东段渠道进行了仿真测试,模拟环境包含水位死区和闸门运动死区。结果表明,所提算法能够有效克服长距离明渠水力滞后的影响,及时有效消除各渠池闸前水位偏差,将水位波动限定在安全范围内。

One to one correspondence of the volume and the water level upstream of check gate in canalpool is clarified, and accordingly, a water level control algorithm by means of volume dynamic regulationis put forward for a constant downstream depth operation canal. The algorithm is designed based on flowbalance and volume balance in canal pools. It consists of a feedforward control section and a feedback con-trol section. The former regulates canal pool volume according to offtake schedules, which is a coarse ad-justment course. The latter corrects the water level errors emerging during the feedforward control period byregulation canal pool volume, which is a fine adjustment course. The algorithm has some merits such assimplicity in theory,having no tedious and difficult tuning process,flexibility in control rules,and well ad-aptation to operation condition variation. The control algorithm is tested on Jiaodong Section of East Routeof South-to-North Water Diversion Project by numerical simulation. Both water level deadband and checkgate movement deadband are simulated. Results show that delay in canal is well dealt with and all canalpools can be controlled properly. Water level errors are eliminated efficiently and water level fluctuationsare confined within the safety range in all pools.