This paper presents an indirect adaptive control scheme for a pH process, which is difficult to control due to its nonlinear dynamics with uncertainties. A nonlinear controller is designed using a backstepping technique, which can deal with a large class of nonlinear systems with parametric uncertainties. The nonlinear controller is combined with a parameter estimator to estimate the concentrations of the reaction invariants in the wastewater stream, and the stability of the proposed adaptive scheme is proved. Simulations show that uniform closed-loop performance is obtained despite the nonlinearitics and parametric uncertainties.
Bibliographical noteFunding Information:
The authors are grateful to financial support by the Korea Science and Engineering Foundation (KOSEF), Korea.
- Adaptive control
- Internal dynamics
- Nonlinear control
- Parameter estimation
- pH control
ASJC Scopus subject areas
- Chemical Engineering(all)
- Computer Science Applications