Identificação e controle LPV de um sistema de dessalinização por osmose reversa

Dayse Maria Benevides de Queiroz; Juliana Sobral Barros; Fabrício Nogueira Gonzalez; Bismark Claure Torrico

doi:10.20906/SBAI-SBSE-2023/3782

Dayse Maria Benevides de Queiroz Departamento de Engenharia Elétrica, Universidade Federal do Ceará, CE
Juliana Sobral Barros Departamento de Engenharia Elétrica, Universidade Federal do Ceará, CE
Fabrício Nogueira Gonzalez Departamento de Engenharia Elétrica, Universidade Federal do Ceará, CE
Bismark Claure Torrico Departamento de Engenharia Elétrica, Universidade Federal do Ceará, CE

DOI: https://doi.org/10.20906/SBAI-SBSE-2023/3782

Keywords: Desalination, Reverse Osmosis, LPV system identification, LPV control

Abstract

This work presents the identification and control of a laboratory scale reverse osmosis desalination plant. Given the nonlinear characteristics of the system, modeling and control were based on the approach of linear systems with varying parameters (LPV). The variable to be controlled is the inlet pressure to the OR membranes and the actuation is performed on a brackish water pressurization pump. As a scheduling variable, the opening of a brackish water feedback valve was adopted, adopting three operating points of the plant: closed valve (0% of opening), semi-open valve (50% of opening) and open valve (100% of opening). The synthesis of an LPV controller to control the inlet pressure to the membrane assembly for different valve opening conditions is also presented. The model identified with real data showed excellent performance in capturing the non-linear dynamics of the system. Moreover, the preliminary control results were satisfactory at simulation level.