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保持滤池水位恒定是水处理生产过程中的重要控制内容。针对净水厂滤池恒水位控制问题,利用工业组态软件设计上位机人机接口界面HMI,通过机理分析法分别建立被控对象和控制通道的数学模型,应用Windows系统动态数据交换——DDE技术设计系统模型与组态程序之间的数据通讯接口,从而实现滤池恒水位控制系统的实时在线仿真。在PID控制器微分运算时,以被控变量的微分代替偏差的微分,避免因设定值的改变而引起微分项的输出锐变。仿真结果与实际生产过程的控制曲线基本吻合,仿真参数应用于滤池恒水位控制系统后,取得理想的控制效果。与传统数值仿真方法相比,运用本方法进行过程控制系统的在线仿真,能够获得控制系统动态过程的实时控制数据,得到与实际生产过程相似的控制效果,为操作人员对实际生产过程的控制提供有益的参考,并可用作岗位工人或学生实习实训的一种方便和有效的培训工具。
Maintaining a constant water level in the filter tank is an important control element in the water treatment process. In view of the constant water level control problem of the water purification plant filter, the HMI of the host computer is designed by using the industrial configuration software, and the mathematic models of the controlled object and the control channel are respectively established by the mechanism analysis method. The dynamic data exchange of Windows system, Technical design of the system model and configuration data communication interface between programs in order to achieve real-time online filter of the water level control system simulation. In PID controller differential operation, differential of controlled variable replaces derivative of differential to avoid sharp change of output of differential term caused by change of set value. The simulation results are in good agreement with the control curves of the actual production process. After the simulation parameters are applied to the constant water level control system of the filter, the ideal control effect is achieved. Compared with the traditional numerical simulation method, the on-line simulation of the process control system can obtain the real-time control data of the dynamic process of the control system and obtain the control effect similar to the actual production process, and provide the operator with control over the actual production process Useful reference, and can be used as a convenient and effective training tool for post workers or student internship training.