制浆废水厌氧处理过程中pH的控制算法研究

Research on Control Strategy of pH for Pulp Wastewater Anaerobic Treatment Process

摘要:

以山东某纸厂的制浆废水厌氧处理过程为背景,建立了pH调节系统的数学模型,组建了模糊PID控制系统,并用Matlab仿真软件对其进行了仿真;研究比较了PID控制、模糊控制和模糊PID控制的阶跃响应、抗干扰响应,对比分析了模型参数摄动时这3种控制算法的鲁棒性能;从仿真结果看,模糊PID的阶跃响应既具有模糊控制的快速性又具有PID控制的稳态无误差,在受到干扰后可以很快恢复到稳态值,达到比较好的控制效果；模型参数发生摄动后,模糊PID控制超调量相对较少,稳态误差为零,但要在200 s时才基本稳定;实验证明模糊PID控制算法的综合性能最好。

Abstract:

A pH control system is established with the actual pulp wastewater anaerobic treatment system in Shandong as the background. A mathematical model of pH regulation system is established and the formation of a pH adjusting with fuzzy PID control system is designed. Simulation using Matlab was carried out to compare the PID control, fuzzy control and fuzzy PID control of the step response and interference response. The results show that:the fuzzy PID control has better comprehensive effect in terms of response speed, stability and disturbance resistance. The test show is that the performance of fuzzy PID control is the best.