模糊控制中的积分作用

Integral Function in Fuzzy Controller

模糊控制器自诞生以来已受到广泛的注意,但它也存在一些缺陷,例如不能消除余差,工作点附近容易产生小范围的极限环振荡等。本文通过分析模糊控制器的控制行为,得出积分作用能保证控制质量的结论。在比较了几种形式的模糊积分作用之后,提出了模糊控制系统中积分控制作用的积分准则。

Fuzzy controller has been considered as a more and more useful tool to deal with a lot of control problem in engineering field. However, there are still some shortcomings in fuzzy controller, such as the offset can not be completely eliminated and there is usually limit-cycle vibration near operation point. A principle of set integral factor in a fuzzy controller is proposed in this paper, after analysing the behaviour of a fuzzy controller and comparing the works have been done in integral function of fuzzy controllers. This principle is based on a fuzzy model with time factor which describes the process much better than other fuzzy models. As an example, a fuzzy controller with integral function is designed using this principle and is applied to the moisture content control system of a full scall papermachine.