一种用于具有纯滞后系统的新控制方法

A NEW CONTROL APPROACH FOR SYSTEMS WITH PURE TIME DELAY

具有纯滞后的系统是一类比较难于控制的系统,对于这类系统较为有效的解决方法是 Smith (?)估器。这种方法对于参考输入能够给出良好响应,但在其它性能上却有不少缺陷。首先,它不能很好的消除外加干扰的影响,甚至带来稳态偏差,其次,它的鲁棒性不强、对模型偏差很敏感。为了改善这些性能,近年来提出了一些改进方案,但这些工作均有一定局限性。本文提出一个新的改进方案,这个方案在综合前人工作的基础上,兼顾了系统的各个主要方面,因而具有较好的总体性能,并以电渣炉数据为例,证明它具有较优越的性能。

System with pure time delay is a kind of system quite difficult to control.Our traditional method forcontrolling such a system is to use a Smith predictor.By means of this method we can obtain good re-sponsibility for reference inputs.Nevertheless it has many defects.First,it can not eliminate the influenceof external interference.It can even bring in some static deviation.Moreover,its robustness is not very welland sensitive to deviation of mathematical model.Recently several measures have been suggested to impove its performance.But they have certain limi-tations.In this paper,we suggest a new approach which considers the main problems in all respects,and leadsto better total performance.We have used,for example,the data of electric slag furnace to show betterperfomances due to this approach.