Identificação do modelo do processo em malha fechada com controlador MPC. / Model identification in closed loop in a process with a MPC control.

AUTOR(ES)

Rodrigo Cáo Pires

DATA DE PUBLICAÇÃO

2009

RESUMO

This work aims at the development of a methodology to the re-identification of the model to be used in a MPC, which is developed in a two layers structure: a target calculation layer and a dynamic layer where the targets to the inputs are implemented. It is expected that the reidentification procedure should be started whenever it is observed a significant degradation of the process model. Here, it is assumed that the model re-identification is to be performed in closed-loop. In the method proposed here, it is assumed that the source code of the MPC controller is not available, and consequently, the proposed method should not require any modification the source code. In the method proposed here, the excitation signal is introduced through the coefficients of the objective function of the target calculation layer. The proposed method is tested by simulation in two different processes. The first one is a distillation column where several linear models obtained at different operating conditions are available. The second process studied here is a nonlinear chemical reactor that is locally represented by a linear model.

ASSUNTO(S)

controle de processos controle preditivo controladores programáveis mpc control system identification process control

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