变频恒压供水系统模糊PID混合控制策略研究

Study on fuzzy-PID integrated control strategy for water supply system with variable frequency and constant pressure

针对城市二次供水系统的非线性、随机性、大惯性和纯滞后特性,提出一种模糊PID混合控制策略实现变频恒压供水。该策略在偏差很小时,控制量主要由PID控制算法给出:在偏差较大时,控制量主要由模糊控制算法给出,充分利用了PID控制的高调节精度和模糊控制良好动态响应性能的优点。仿真实验结果表明:该控制策略能较好地解决城市二次供水的水压不稳问题,同时对供水系统模型参数变化具有很好的适应性,在城市二次供水系统中具有广阔应用前景。

A fuzzy-PID control strategy for water supply system with variable frequency and constant pressure is proposed,according to characters of system such as nonlinearity,randomicity,large inertia and pure lag.The control strategy combines the advantages of good dynamic response of fuzzy control and high regulation precision of PID control.If the error is small,control output will be determined by PID control algorithm.And if the error is large,control output will be determined by fuzzy control algorithm.The simulation experimental results show that this control strategy can solve the problem of unstable water pressure in water supply and well adapt to the variable model parameters of water supply system has broad application prospect in the city secondary water supply system.