Hybrid adaptive observer-based output feedback predictive control for the alternating activated sludge process. (August 2021)

• Record Type: Journal Article
• Authors: Boudagga, Afef; Dimassi, Habib; Hadj Said, Salim; M'Sahli, Faouzi
• Is Part Of: Transactions of the Institute of Measurement and Control. Volume 43:Number 12(2021)
• Page Start: 2742
• Page End: 2756
• Publication Date: 2021-08
• Subjects: Nonlinear hybrid system -- alternating activated sludge process -- hybrid adaptive observer -- predictive control; Automatic control -- Periodicals; Measuring instruments -- Periodicals; Commande automatique -- Périodiques; Mesure -- Instruments -- Périodiques; 681.2
• DOI: 10.1177/01423312211005624
• Languages: English
• ISSNs: 0142-3312

Abstract

In this paper, an adaptive observer-based predictive controller is designed for the alternating activated sludge process which represents a nonlinear hybrid system. Precisely, our objective is to control the dissolved oxygen concentration during the aerobic phase. First, a hybrid adaptive observer is designed to estimate conjointly the unmeasured state (the ammonia concentration) and the unknown parameter (the coefficient of performance of heterotrophic biomass). Then the estimated signals are used in the output feedback predictive control law. The convergence of the state estimation, parameter reconstruction and tracking control errors are established through a Lyapunov stability analysis. Numerical simulations are dedicated to highlight the good performances of the developed output feedback control approach.