基于二自由度PID前馈解耦的恒温恒湿控制系统设计

Design of Constant Temperature and Humidity Control System Based on Two Degree of Freedom PID and Decoupling Feedforward

设计一种基于二自由度PID前馈解耦的恒温恒湿控制系统,利用阶跃响应实验测得系统响应曲线,结合机理法搭建数学模型,设计解耦环节,把多变量耦合控制系统处理为多回路互不干扰的单变量控制系统,使用二自由度PID控制器,调节PID参数,使外部干扰响应性能最优,目标值滤波器处理温湿度设定值,使目标值响应性能也达到最优。仿真结果表明,该控制系统减小了温度和相对湿度的互相干扰,保证了温湿度值平稳不抖动。

A constant temperature and humidity control system based on two degree of freedom PID and decoupling feedforward was designed.In the step response experiments,controlled system step response curve was measured.By mechanism method,the model of the controlled system was eatablished.Decoupling link was built to process multi-variable coupling control system into multi-loop single-variable one without interact interference.Two degree of freedom PID regulator was used to adjust PID parameter,which enables external disturbance response to achieve optimal performance.The set-point was processed by target value filter to abtain optimal performance.The simulation results show that the control system reduces the mutual interference between temperature and relative humidity and ensures stable temperature and humidity values without jitter.