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基于多变量广义预测控制的不稳定系统控制结构选择方法

DOI: 10.3724/SP.J.1004.2013.01547, PP. 1547-1551

Keywords: 不稳定系统,变量配对,广义预测控制,控制结构选择

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Abstract:

?对于多输入多输出系统,在控制系统设计时首先要对被控变量和操纵变量进行控制结构选择.Bristol提出的相关增益矩阵(Relativegainarray,RGA)法,以及学者们后来提出的各种改进方法,都只适用于稳定系统.本文针对不稳定系统,基于多变量广义预测控制(Generalizedpredictivecontrol,GPC)的闭环控制律提出了一种控制结构的变量匹配准则.通过对预测时域、控制时域等各个参数的优化选择,使系统闭环稳定;由闭环控制律得到被控变量期望值与操纵变量的相关性矩阵,以此得出控制结构的变量配对方案.通过实例研究表明,对于开环不稳定系统,该方法可以得出正确的变量配对结果.

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