%0 Journal Article
%T Um m¨¦todo evolucion¨¢rio para sintonia de controladores PI/PID em processos multivari¨¢veis
%A Arruda
%A L¨²cia Val¨¦ria R. de
%A Swiech
%A Maria Cristina Szpak
%A Neves-Jr
%A Fl¨¢vio
%A Delgado
%A Myriam Regattieri
%J Sba: Controle & Automa£¿£¿o Sociedade Brasileira de Automatica
%D 2008
%I Sociedade Brasileira de Autom¨¢tica
%R 10.1590/S0103-17592008000100001
%X nonlinear multiple-input multiple-output (mimo) processes which are common in industrial plants are characterized by significant interactions and nonlinearities among their variables. thus, the tuning of several controllers in complex industrial plants is a challenge for process engineers and operators. this paper addresses the problem of simultaneously tuning n proportional-integral-derivative (pi/pid) controllers in a coupled multivariable process as a multi-criteria optimization problem. a multi objective genetic algorithm modified by a niching technique with castes formation is proposed to solve this problem. the optimization is carried out in two levels. in the first level a local function that considers both the integral time squared error (itse) and the minimum variance criteria is computed to separately evaluate the performance of each closed loop. thereafter, a global cost function that considers all the loops is used to compute a set of solutions (a set of pi/pid parameters) to the optimization problem. the proposed system was applied to the control of a fluid catalytic cracking (fcc) unit, and its performance was compared to dynamic matrix control (dmc). the results show the applicability and effectiveness of the proposed method.
%K mimo control
%K pi/pid control
%K multi objective genetic algorithm
%K niching
%K castes.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-17592008000100001&lng=en&nrm=iso&tlng=en