纯滞后系统的模糊复合控制方法

针对具有纯时间滞后的系统,分析了PID算法、Smith预估算法以及模糊控制的不足,由此提出了一种新的模糊复合型控制器,该控制器是基于Smith预估的模糊-PID控制器,利用Smith预估算法克服纯滞后,利用模糊控制来提高系统的鲁棒性,而在稳态阶段则切换为PID控制来提高控制精度.在模型匹配和失配情况下进行了仿真研究,结果表明该复合型控制器既具有模糊控制较强的鲁棒性,又具有PID控制精度高的特点,尤其是在模型失配时表现出良好的稳定性和鲁棒性,对于大时间滞后系统是一种实用而简便的控制方法.

Fuzzy Complex Control for System with Pure Time Delay

The shortage of some control algorithms for the system with pure time delay is analyzed. They are PID control, Smith predictor algorithm and fuzzy control. A new algorithm of complex control is presented which is a fuzzy-PID controller based on Smith predictor. Smith predictor algorithm compensates for the time delay and fuzzy control is used to enhance the robustness of the system and PID algorithms are used to improve the precision of system when it is steady. The simulation of the new control algorithm is studied under the condition of model matching and unmatched model. The simulation shows that the new control algorithm has a better characteristic of stability and robustness. And it is an appropriate and simple control method for the system with pure time delay.