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针对序批式活性污泥法(SBR,Sequencing Batch Reactor)污水处理过程具有的非线性、时变、强耦合等特性,并考虑污水处理过程控制存在入水水质流量等干扰量,进一步加大控制难度等问题,本文提出1种扰动观测器与模糊PID结合的污水处理控制方法。首先分析扰动观测器结构特点以及核心部分低通滤波器的选择,设计扰动观测器对控制过程常见干扰量进行预测,并根据预测扰动信号在控制系统输入端进行有效补偿,达到抵消干扰的效果:同时在此基础上结合模糊PID控制方法,自适应整定PID控制器参数,实现溶解氧DO的优化控制。最后建立仿真模型进行实验,并与常规PID控制和模糊PID控制效果进行对比,结果表明该组合控制方法能有效克服干扰,控制精度较高,具有较强的适应性和鲁棒性。
In view of the non-linear, time-varying and strong coupling characteristics of SBR (Sequencing Batch Reactor) sewage treatment process and considering the existence of interference such as inflow and discharge of water quality in the wastewater treatment process, the control difficulty is further increased And other issues, this paper presents a disturbance observer and fuzzy PID combined with sewage treatment control methods. Firstly, the structural characteristics of the disturbance observer and the selection of the low-pass filter in the core are analyzed. The disturbance observer is designed to predict the common disturbance in the control process, and the disturbance is compensated effectively according to the predicted disturbance signal at the input of the control system. At the same time, based on the combination of fuzzy PID control method, PID controller parameters are adaptively adjusted to achieve DO optimal control. Finally, a simulation model is established and compared with the conventional PID control and fuzzy PID control. The results show that the combined control method can effectively overcome the interference and has high control accuracy and strong adaptability and robustness.