title: Survey on methods of increasing the efficiency of extended state disturbance observers.
abstract: This survey presents various methods of improving the overall estimation quality in the class of extended state observers (ESO), which estimate not only the conventional states of the system, but the acting disturbance as well. This type of observers is crucial in forming the active disturbance rejection control structure (ADRC), where the precision of online perturbation reconstruction and cancellation directly influences the robustness of the closed-loop control system. Various aspects of the observer-based disturbance estimation/rejection loop are covered by this work and divided into three categories, related with observer: structure, tuning, and working conditions. The survey is dedicated to researchers and practitioners who are interested in increasing the efficiency of their ADRC-based governing schemes.
authors.affiliation: Chair of Control and Systems Engineering, Faculty of Computing, Poznań University of Technology, ul. Piotrowo 3a, 61-138, Poznań, Poland. Electronic address: rafal.madonski@doctorate.put.poznan.pl.
authors.forename: R
authors.initials: R
authors.lastname: Madoński
authors.affiliation: Chair of Control and Systems Engineering, Faculty of Computing, Poznań University of Technology, ul. Piotrowo 3a, 61-138, Poznań, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Herman
keywords: ADRC; Control of mechanical systems; ESO; Estimation and detection; Feedback control; Perturbations; Problems with incomplete information; Robustness; Survey