Composite Hierarchical Anti-disturbance Fuzzy Control for Nonlinear Interconnected Systems Via Disturbance Observer.

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Title:	Composite Hierarchical Anti-disturbance Fuzzy Control for Nonlinear Interconnected Systems Via Disturbance Observer.
Authors:	Shangchun Mao¹ scmao2022@ahut.edu.cn, Cheng Qian¹ qiancheng3011@163.com, Zhilian Yan² zlyan@ahut.edu.cn, Taiping Jiang³ tpjiang2008@163.com
Source:	Engineering Letters. Apr2025, Vol. 33 Issue 4, p849-859. 11p.
Subjects:	Nonlinear systems, Exponential stability, Fuzzy systems, Closed loop systems, Adaptive fuzzy control, Computer simulation
Abstract:	This paper is devoted to the composite hierarchical anti-disturbance fuzzy control for nonlinear interconnected systems (NISs) subject to multiple disturbances, including a norm-bounded disturbance and an unknown disturbance generated by an exogenous system. H∞ control and the composite disturbance-observer-based control consisting of a feedforward compensation term and a state-feedback sampled-data control are employed to attenuate and compensate these two types of disturbances in the T-S fuzzy framework, respectively. To start with, NISs, exogenous disturbance, disturbance observer, and composite controller are all modeled using T-S fuzzy model technology. By building a time-dependent function, a sufficient condition is then established to ensure the exponential stability of the estimation error system and closed-loop NISs with a prescribed H∞ performance level. Following this, the joint design of the desired observer and composite disturbance-observer-based fuzzy controller is developed. Finally, a numerical simulation is performed to demonstrate the effectiveness of the presented composite hierarchical control scheme. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This paper is devoted to the composite hierarchical anti-disturbance fuzzy control for nonlinear interconnected systems (NISs) subject to multiple disturbances, including a norm-bounded disturbance and an unknown disturbance generated by an exogenous system. H∞ control and the composite disturbance-observer-based control consisting of a feedforward compensation term and a state-feedback sampled-data control are employed to attenuate and compensate these two types of disturbances in the T-S fuzzy framework, respectively. To start with, NISs, exogenous disturbance, disturbance observer, and composite controller are all modeled using T-S fuzzy model technology. By building a time-dependent function, a sufficient condition is then established to ensure the exponential stability of the estimation error system and closed-loop NISs with a prescribed H∞ performance level. Following this, the joint design of the desired observer and composite disturbance-observer-based fuzzy controller is developed. Finally, a numerical simulation is performed to demonstrate the effectiveness of the presented composite hierarchical control scheme. [ABSTRACT FROM AUTHOR]
ISSN:	1816093X