Active disturbance rejection adaptive output feedback control of uncertain nonlinear systems. (16th July 2021)

• Record Type: Journal Article
• Authors: Mi, Yize; Yao, Jianyong
• Is Part Of: International journal of robust and nonlinear control. Volume 31:Number 15(2021)
• Page Start: 7461
• Page End: 7479
• Publication Date: 2021-07-16
• Subjects: adaptive control -- extended state observer -- mismatched uncertainty -- output feedback -- uncertain nonlinear systems; Automatic control -- Periodicals; Control theory -- Periodicals; Nonlinear systems -- Periodicals; 629.836
• DOI: 10.1002/rnc.5695
• Languages: English
• ISSNs: 1049-8923

Abstract

Abstract: This article concerns the output feedback tracking control problem for a class of single‐input‐single‐output (SISO) nonlinear systems in a semistrict feedback form, which possesses both matched and mismatched uncertainties, including parametric uncertainties and unknown nonlinear disturbances. An active disturbance rejection adaptive output feedback control scheme is proposed via backstepping method, in which parametric uncertainties are handled by adaptation law and disturbances are estimated by a series of linear extended state observers (LESOs). The learning burden of LESOs is much alleviated due to active compensation of parametric uncertainties via adaptation. In addition, both matched and mismatched disturbances are estimated in the construction of LESO for each channel of the considered nonlinear plant. Hence, all various of uncertainties can be mostly compensated. Consequently, prescribed transient performance and steady‐state tracking accuracy can be guaranteed. Theoretical analysis reveals the tracking error can be made arbitrarily small. Furthermore, exponentially asymptotic output tracking can be achieved when unknown disturbances are constants. Finally, comparative simulation studies are presented to illustrate the effectiveness of the proposed scheme.