结晶器液位系统线性自抗扰控制仿真

Simulation of linear auto disturbance rejection control for liquid level control system of crystallizer

连铸生产过程结晶器液位系统具有典型的非线性和模型的不确定性.为了提高系统的控制精度和抗干扰能力,设计了一种线性自抗扰控制器.通过对结晶器液位系统模型分析,得到二阶系统的传递函数模型,设计出三阶线性扩张状态观测器,可对未知扰动的观测结果作出实时估计和补偿,由此设计出线性自抗扰控制器.数字仿真实验表明,结晶器液位系统中,线性自抗扰控制系统波动幅度较小,恢复平稳时间短,具有很好的动态性能,比传统PID控制具备更好的抗扰能力.

Liquid level control system of custallizer has typical nonlinearity and model uncertainty in contin- uous casting process. A linear -auto disturbance rejection controller is designed in this paper for improving the control precision and anti -intmfference ability. The transfer function model of second order system can be ob- tained from the model analysis about the custallizer liquid level system. Therefore, the design of the third order linear extended state obsurver is realized to make real - time obsmw-ation resuhs of unknown disturbance estima- tion and compensation. Finally, the linear ADRC has been designed. The experiment resuhs of numerical simu- lation show that the linear auto disturbance rejection control has smaller fluctuation range, recover faster, and better dynamic performance, which has better anti - disturbance capability than traditional PID control in custal- lizer liquid level system.