Hybrid adaptive observer-based output feedback predictive control for the alternating activated sludge process

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.

Adaptive coexistence of synchronization and anti-synchronization for a class of switched chaotic systems

“…Switched systems are a class of hybrid systems, which arise in various fields of real life world, such as electrical system 1,2 , communication networks 3,4 , flight control 5 , network control systems [6][7][8][9] , traffic control 10 , and processes control 11,12 , etc. In the past two decades, increasing attention has been paid to the analysis and synthesis of switched systems due to their significance in both theory and applications, and many significant results have been obtained for the analysis and design of switched systems.…”