针对大滞后系统的滞后时间削弱自抗扰控制方法

Decreasing time delay auto-disturbance rejection control method for large time delay systems

针对工业中较难控制的大滞后系统,提出了一种滞后时间削弱的自抗扰控制方法,该方法首先将大滞后对象转化为小滞后对象,然后结合自抗扰控制思想对简化后的小滞后对象进行控制。本文方法解决了传统Smith预估控制等方法在被控对象模型预估不准确的情况下很难取得较好的控制效果的问题,并改善了自抗扰控制器在滞后时间较大的情况下稳定时间较长的缺点。最后将该方法与传统的PID结合Smith预估控制及自抗扰控制的控制效果进行对比。仿真结果表明,本文控制方法可以有效地改善大滞后对象的控制效果,提高了系统的动态性能和鲁棒性。

In this paper, a n e w method is proposed to control large time delay systems. First, the large lag time is transformed into small lag time through the decreasing time delay theory. T h e n , auto-disturbance rejection control theory is used in the transformed object to improve the performance of the system. The method can be used to solve the problem that traditional P I D with Smith control method can not achieve better control effect on the inaccurate object model. T h e method also overcomes the shortcoming that the single auto-disturbance rejection controller has a long setting time. The control effect of this method is compared with the traditional P I D with Smith control method and the single active disturbance rejection control method. Simulation results s h o w that this method can achieve a better control effect for large time delay systems. It can effectively improve the dynamic performance and robustness of the system.