A Multiobjective Evolutionary Neuro-Controller for Nonminimum Phase Systems

Dongkyung NAM  Hajoon LEE  Sangbong PARK  Lae-Jeong PARK  Cheol Hoon PARK  

IEICE TRANSACTIONS on Information and Systems   Vol.E87-D    No.11    pp.2517-2520
Publication Date: 2004/11/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Biocybernetics, Neurocomputing
nonminimum phase systems,  multiobjective evolutionary algorithms,  neural networks,  neuro-control,  

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Nonminimum phase systems are difficult to be controlled with a conventional PID-type controller because of their inherent characteristics of undershooting. A neuro-controller combined with a PID-type controller has been shown to improve the control performance of the nonminimum phase systems while maintaining stability. In this paper, we apply a multiobjective evolutionary optimization method for training the neuro-controller to reduce the undershooting of the nonminimum phase system. The computer simulation shows that the proposed multiobjective approach is very effective and suitable because it can minimize the control error as well as reduce undershooting and chattering. This method can be applied to many industrial nonminimum phase problems with ease.