Smith预估器离散化问题的研究  

Research on Discretization Problem of Smith Predictor

作　　者：初祥祥[1] 钱洁[1] 

机构地区：[1]东南大学电气工程学院,江苏南京210096

出　　处：《工业控制计算机》2010年第3期60-62,共3页Industrial Control Computer

摘　　要：主要研究了预估器的输入信号不同时各种方案的优劣,和离散化过程中预估器传递函数的选取及在采样控制系统中由于ZOH和FOH的差异对于预估器影响,并对其算法实现的可行性进行了论证,旨在找出一种更合适可行的方法实现Smith预估器的离散化。共探讨了四种在大延迟系统中Smith预估器离散化方法:一是预估器的输出直接取自PID后,预估器的函数不包括ZOH(zero-order-holder);二是预估器的信号直接取自数字PID后,Smith预估器包含ZOH环节;三是预估器的输出直接取自ZOH后,预估器传递函数不包含ZOH;四是采用一阶保持器(FOH)。方式三、方式四均是该文的有益的尝试。First of all,this paper mainly focuses on researching the advantages and disadvantages of the methods which are used when the input signals are different.Secondly,it makes a research on the selection of the transfer functions of the predictor during the discretization process.Thirdly,the paper also study how the difference of ZOH and FOH in the sampling control system make an influence on the predictor,what＇s more,a better control method can be brought forward by combining the method with the adaptive theory of the predictor.There are four methods of the predictor discretization in the large delay system,they are：first,the intput of the predictor comes from PID directly and ZOH is not included by the predictor function; second,the input of the predictor comes from ZOH directly and ZOH is not included by the predictor function;third,the signal of the predictor comes from PID directly and ZOH is unincluded by the Smith Predictor,fourth,FOH is used.It is worth mentioning that the third method and the fourth method are useful try of the writers.

关 键 词：施密斯预估控制器 离散化 延迟 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]