Resumo

GONZALEZ YERO, Guillermo; RAMIREZ MENDOZA, Mercedes  e  MAYO MARTI, Liset. A new method of robust nonlinear PI control. EAC [online]. 2017, vol.38, n.1, pp.1-16. ISSN 1815-5928.

This paper presents a robust nonlinear PI control. The dynamic balance of tradeoff between performance and robustness inside of a robustness region and to guarantee a balance's trayectory that minimize the integrated absolute error are the objectives of the design. A parabolic combined with static non linearity of dead zone and saturation is the nonlinear function used, its tuning has been formulated as a multi-objective optimization problem using global performance indices. With respect to other approaches of nonlinear PI control previously presented, the proposed tool is the first for solving the design's problem considered and is simple while increasing the performance-adjustment and the industrial applicability. A simulationt test for the complex process of mould level control in a steel continuous casting using the new robust nonlinear PI control illustrates the efficiency of this method.

Palavras-chave : performance; robustness; nonlinear proportional-integral (NPI) control; optimization.

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