Actuator fault estimation for two-stage chemical reactor system based on delta operator approach. (November 2021)

• Record Type: Journal Article
• Authors: Wu, Yu; Du, Dongsheng; Liu, Bei; Mao, Zehui
• Is Part Of: Journal of process control. Volume 107(2021)
• Page Start: 37
• Page End: 46
• Publication Date: 2021-11
• Subjects: Actuator fault estimation -- Delta operator -- PIO -- Two-stage chemical reactor system; Process control -- Periodicals; Fabrication -- Contrôle -- Périodiques; Process control; Periodicals; Electronic journals; 660.281
• DOI: 10.1016/j.jprocont.2021.09.013
• Languages: English
• ISSNs: 0959-1524

Abstract

Abstract: Based on the delta operator approach, a new method of actuator fault estimation for a two-stage chemical reactor system is presented with time-delay and outside disturbances. Firstly, a nonlinear delta operator mathematical model is established to describe the two-stage chemical reactor systems by using the mechanism analysis method. In order to estimate the actuator fault, the proportional–integral observer (PIO) is employed as the state estimator. Meanwhile, a novel delta operator-based actuator fault estimation algorithm is proposed. Then, by means of the Lyapunov–Krasovskii functional technique, sufficient conditions are derived to guarantee that the error system is asymptotically stable with a predefined H ∞ performance index. Next, the desired PIO can be designed. Finally, simulation results are given to illustrate the effectiveness of the proposed methods. Highlights: A novel proportional and integral fault estimation algorithm is firstly proposed. This method connects continuous-time systems and discrete-time systems. A practical simulation example is given to verify the method. The system model in this paper is more universal and practical.