基于PID参数自整定的双容系统抗扰控制

针对双容液面调节系统的非线性、参数时变的特点,基于现代控制理论设计了带扰动观测器的模糊自整定控制器.把这种控制器应用在双容液面调节系统中,既实现了PID控制器参数的在线自整定,又增强了系统的抗扰能力.仿真试验表明,这种方案极大地提高了被控对象的静态和动态性能,对参数时变的适应能力强,鲁棒性好.该方案同样可以用于其他非线性、时变系统.

Disturbance rejection control for a two-tank system based on self-adaptive PID

In view of the characteristics of nonlinearity and time-variance in a two-tank liquid level regulation system, a fuzzy self-adaptive controller is designed with a disturbance observer according to the modern control theory. The controller makes it possible to perform the on-line self-tuning function and enhance the disturbance rejection of the system. The simulation test shows that this design conception can improve the static and dynamic performance of the controlled plant so that the system can adapt itself to the time-varing parameters and also improve its robustness. This design is also suitable for any other nonlinear and time-varying system.