基于双极性PID算法的温度控制系统

摘要

在PLC中编写PID程序模块实现对模拟工业对象的电加热锅炉进行加热、冷却双极性控制.双极性PID算法设计采用位置型算法思想和结构化编程方法.算法中引入控制带,避免了积分饱和现象.并对偏差应用死区处理,抑制了小幅恒定振荡.冷却过程中,采用提前控制、变控制参数的方法避免控制的延迟及超调.控制算法中还引入了输出死区、限幅、积分清零等多种控制手段.监控结果显示:PID算法程序模块对温度对象的针对性较强,控制结果超调量较小,稳态误差小于0.2℃.%PID programming module was compiled independently to achieve the simulation of industrial objects electric heating boiler and cooling bipolar control based on PLC.Design of the dual Polarity PID algorithm used position type algorithm and a structured programming.With the introduction of control algorithm,PID algorithm can avoid integral saturation phenomenon.The deviation applied dead-time processing to suppress the small constant oscillation.In order to avoid the control delay and the overshoot,it used advanced control and variable parameter control method during the cooling process.The control algorithm introduced some control means,such as the output dead,the output limiting,the integral reset.Monitoring results show that the PID program modules has targeted control to the temperature object,smaller overshoot and the steady-state error is less than 0.2 ℃.