Adaptive Neural Control and Modeling for Continuous Stirred Tank Reactor with Delays and Full State Constraints

• Published in: Complexity (New York, N.Y.) Vol. 2021; no. 1
• Main Authors: Li, Dongjuan, Wang, Dongxing, Gao, Ying
• Format: Journal Article
• Language: English
• Published: Hoboken Hindawi 2021; John Wiley & Sons, Inc; Wiley
• Subjects: Adaptive control; Continuously stirred tank reactors; Control methods; Control stability; Control systems design; Controllers; Design; Fuzzy logic; Liapunov functions; Network control; Neural networks; Reactors; Systems stability; Time lag; Tracking errors
• ISSN: 1076-2787; 1099-0526
• DOI: 10.1155/2021/9948044

In this paper, an adaptive neural network control method is described to stabilize a continuous stirred tank reactor (CSTR) subject to unknown time-varying delays and full state constraints. The unknown time delay and state constraints problem of the concentration in the reactor seriously affect the input-output ratio and stability of the entire system. Therefore, the design difficulty of this control scheme is how to debar the effect of time delay in CSTR systems. To deal with time-varying delays, Lyapunov–Krasovskii functionals (LKFs) are utilized in the adaptive controller design. The convergence of the tracking error to a small compact set without violating the constraints can be identified by the time-varying logarithm barrier Lyapunov function (LBLF). Finally, the simulation results on CSTR are shown to reveal the validity of the developed control strategy.