On stability analysis of active disturbance rejection control for nonlinear time-varying plants with unknown dynamics

By Q. Zheng, Linda Q. Gao, Zhiqiang Gao. IEEE Conference on Decision and Control, 2007

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Stability of active disturbance rejection control for uncertain systems: A Lyapunov perspective (2017, methodology): “ity characteristics of ADRC for some well-known nonlinear time-varying plants were presented in [15].”
Generalized Extended State Observer Based Control for Systems With Mismatched Uncertainties (2012, background): “Among the previously listed approaches, ESO requires the least amount of plant information [22]; in fact, only the system order should be known.”
Iterative Learning Control with Extended State Observer for Telescope System (2015, background): “The proof can be found in the literature [22].”
On the convergence of an extended state observer for nonlinear systems with uncertainty (2011, background): “3) presented in [25] where the a in the following Corollary 2.”
Active Disturbance Rejection Adaptive Control of Hydraulic Servo Systems (2017, methodology): “Furthermore, based on the primary analysis in [26], it can be inferred that the constructed linear ESOs in (12) and (13) are stable and the”
Extended-State-Observer-Based Output Feedback Nonlinear Robust Control of Hydraulic Systems With Backstepping (2014, methodology): “In this paper, by referring to the linear ESO in [34] and integrating the backstepping method in [37], a novel output feedback nonlinear robust controller is proposed for a hydraulic rotary actuator, in which the intermediary virtual control law and the final control law are derived based on the est”