Article
Automation & Control Systems
Yanchun Bai, Jianyong Yao, Jian Hu
Summary: This paper designs a new observer to address the issue of disturbance rejection in nonlinear plants with sense delay and measurement noise. The proposed cascade observer is capable of rapidly and accurately reconstructing system signals and compensating for output delay while avoiding the amplification of measurement noise.
Article
Computer Science, Artificial Intelligence
Xilian Zhang, Tao Xu, Zhao Zhang, Zhisheng Duan
Summary: This paper proposes a parallel extended state observer (PESO) by merging different order linear tracking differentiators and first-order nonlinear differentiators, considering both measurement noises and system uncertainties. The parallel structure ensures the independence of observed information, effectively avoiding the accumulation of observation error. PESO is utilized to estimate the total disturbance, and a composite controller is developed based on its observation results. The convergence performance of PESO and the controller is rigorously verified, and numerical simulation results demonstrate the effectiveness and superiority of the proposed method.
Article
Automation & Control Systems
Kanghui He, Chaoyang Dong, Qing Wang
Summary: This paper proposes a novel extended state observer (ESO) to tackle the active disturbance rejection control (ADRC) design for uncertain nonlinear systems with sporadic measurements. The ESO, reset compensator, and continuous ADRC law are designed to accurately estimate system states and ensure the stability of the closed-loop system.
IEEE-CAA JOURNAL OF AUTOMATICA SINICA
(2022)
Article
Automation & Control Systems
Youwu Du, Weihua Cao, Jinhua She
Summary: This article presents a new method that uses the active disturbance rejection control (ADRC) paradigm to address the control problem for a specific type of non-linear systems with unknown disturbances and measurement noise. An improved extended state observer (ESO) is introduced to separate disturbance estimation from state reconstruction, with a new parameter for independent adjustment of disturbance-rejection performance. The method is validated through simulation and experimental results, demonstrating its superiority in disturbance rejection and noise suppression compared to traditional methods.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Syeda Nadiah Fatima Nahri, Shengzhi Du, Barend J. van Wyk
Summary: The latest research on disturbance rejection mechanisms has shown that active disturbance rejection control (ADRC) is an effective controller for uncertainties and nonlinear dynamics in systems. The significance of the ADRC controller lies in its model-free nature and ability to estimate and compensate for disturbances with the extended state observer (ESO). However, designing an ADRC controller becomes more challenging due to different system disturbances, such as output disturbances, measurement noise, and time-delays. This paper proposes a predictive ESO-based ADRC controller for time-delay systems, which compensates for disturbances originating from time delay.
Article
Automation & Control Systems
Shaohua Wang, He Gan, Ying Luo, Xiaohong Wang, Zhiqiang Gao
Summary: This study proposes a novel fractional-order ADRC (FOADRC) approach, which improves the disturbance estimation performance of the extended state observer (ESO) by designing a fractional-order model-aided extended state observer (FOMESO), while reducing noise sensitivity.
Article
Automation & Control Systems
Jiankun Sun, Xiangyang Liu, Jun Yang, Zhigang Zeng, Shihua Li
Summary: This article investigates the multirate disturbance rejection control problem for linear control systems with mismatched disturbance and measurement delay using predictor-based extended state observer. The disturbance rejection property of the resultant closed-loop control systems is enhanced despite the multirate and measurement delay.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Krzysztof Lakomy, Rafal Madonski
Summary: A new observer design is proposed to improve estimation performance in the presence of noise by utilizing a unique cascade combination of ESOs, allowing for fast and accurate signal reconstruction while avoiding over-amplification of measurement noise. The introduced observer structure shows improvement over standard solutions in terms of noise attenuation, as verified through numerical validation and theoretical analysis.
Article
Computer Science, Information Systems
Chunwan Lv, Zhengyong Ouyang, Zehao Wu, Feiqi Deng, Mingqing Xiao
Summary: This study addresses the practical tracking problem for a class of MIMO uncertain stochastic systems driven by colored noises. The active disturbance rejection control approach is used to estimate the unmeasurable states and disturbance in real time, and design controllers to achieve practical convergence of tracking errors.
SCIENCE CHINA-INFORMATION SCIENCES
(2022)
Article
Automation & Control Systems
Jinhua She, Kou Miyamoto, Qing-Long Han, Min Wu, Hiroshi Hashimoto, Qing-Guo Wang
Summary: This paper provides a deep observation and comparison between two active disturbance-rejection methods: the generalized extended-state observer (GESO) and the equivalent input disturbance (EID). The comparison covers assumptions, system configurations, stability conditions, system design, disturbance-rejection performance, and extensibility. A time-domain index is introduced to assess the disturbance-rejection performance. The observation reveals the superiority of the EID approach over the GESO method in terms of disturbance suppression mechanisms, practical assumptions on disturbances, and ease of adjusting disturbance-rejection performance.
IEEE-CAA JOURNAL OF AUTOMATICA SINICA
(2023)
Article
Automation & Control Systems
Lingxin Bao, Chunwan Lv, Ze-Hao Wu, Mingqing Xiao
Summary: This paper addresses the active disturbance rejection control approach for a class of lower triangular uncertain stochastic nonlinear systems driven by coloured noises. An extended state observer is first constructed to estimate the stochastic total disturbance, and then an active disturbance rejection controller is designed to achieve desired closed-loop performance. Numerical simulations validate the practicality of the proposed control strategy.
INTERNATIONAL JOURNAL OF CONTROL
(2022)
Article
Automation & Control Systems
Sushant N. Pawar, Rajan H. Chile, Balasaheb M. Patre
Summary: This paper describes a predictive extended state observer-based robust control for uncertain process control applications. The technique uses the extended state observer (ESO) to estimate system dynamics and disturbances encountered, with the implementation of a predictive algorithm to extend applicability to time-delayed higher-order processes.
TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL
(2021)
Article
Automation & Control Systems
Jixing Lv, Changhong Wang, Yonggui Kao, Yushi Jiang
Summary: This paper investigates the fixed-time distributed estimation problem for a class of second-order nonlinear systems with uncertain input, unknown nonlinearity, and matched perturbation. A fixed-time distributed extended state observer is proposed, which can reconstruct both the full state and unknown dynamics of the system. The proposed observer reduces the communication load by requiring only the output of the leader and 1-dimensional output estimates from the neighboring nodes.
Article
Automation & Control Systems
Yinlong Hu, Xuhao Cai, Jiawei Peng, Shang Shi
Summary: This paper presents a prescribed-time output stabilization method for mismatched uncertain systems using state-feedback control and extended disturbance compensation. The settling time of the closed-loop system can be predetermined regardless of initial conditions, design parameters, and admissible disturbances, due to the prescribed-time convergence of the proposed control method. The control method effectively alleviates the chattering problem and suppresses disturbances, especially the mismatched disturbance.
Article
Automation & Control Systems
Kanghui He, Chaoyang Dong, Qing Wang
Summary: This paper rigorously investigates the problem of active disturbance rejection control for nonlinear systems subject to uncertainties and dead-zone input. Utilizing an extended state observer (ESO) and a switched dynamic parameter estimation law, the paper separates the dead-zone model from the total uncertainty and estimates the parameters of dead-zone online. The theoretical analysis of stability shows that the closed-loop system has multi-time scale convergence properties.
ASIAN JOURNAL OF CONTROL
(2022)
