纯滞后系统PID-模糊控制

PID-fuzzy Control System with Pure Lag

为了保证城市供水质量,常常采用变频恒压供水方式。针对恒压供水系统的非线性、随机性、大惯性和纯滞后特性,提出了一种带Smith预估的PID-模糊复合控制策略。这种控制策略融合了模糊控制动态响应性能好、PID控制调节精度高以及Smith预估纯滞后补偿的优点。在保留了系统很好的动态过程平稳性和稳态性能的基础上,明显改善了系统的动态过程快速性,同时对被控对象模型参数变化具有很好的适应性,鲁棒性好。仿真实验结果表明:带Smith预估的PID-模糊复合控制策略可使恒压供水系统的动态稳态性能明显优于常规PID、模糊控制和PID-模糊复合控制。

In order to ensure the quality of urban water supply,the water supply with frequency conversion and constant pressure is often used. A PID-fuzzy control strategy with Smith predictor is proposed for the constant pressure water supply system, which has the characters of nonlinearity,randomicity,large inertia and big delay.This control strategy combines the advantages of good dynamic response of fuzzy control,high regulation accuracy of PID control and pure lag compensation of Smith predictor.On the basis of retaining the system＇s stationarity,dynamic process and steady state performance,this control strategy can evidently improve the speedability of dynamic process,has good robustness and has well adaptability to variational model parameters.