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Extended State Observer Based on ADRC of Linear System with Incipient Fault
Xingxing Hua,Da-Rong Huang,Shenghui Guo 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.6
Owing to the fact that it is difficult to find the incipient fault and it is hard to deal with the disturbance, an extended state observer (ESO), which is based on the linear time invariant system is designed and analyzed. This method can effectively separate incipient fault as a new state variable from the disturbance. By using coordinate transformations, the original system is decoupled into two subsystems. Especially, an adaptive observer of faulty system is designed for the one subsystem with the incipient fault but not relevant to the disturbance, and an extended state observer (ESO) based on active disturbance rejection control (ADRC) is designed for the other one which not only has the disturbance but also the incipient fault. Two simulation results are presented to show the effectiveness of the presented methods.
Xin Dai,Xingxing Hua,Shaoxin Sun,Yue Sun 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.12
This paper investigates the incipient fault diagnosis problem of the multiple-output wireless power transfer system (MWPTS). And the MWPTS described in this paper has nonlinearity and high-order characteristics. Firstly, based on the Kirchhoff theorem and the interconnect system modeling method, a more realistic dynamics model of MWPTS with incipient faults, parameter uncertainty, and time delay is established. The proposed modeling method dramatically reduces the order of MWPTS. Then, a novel observer-based control strategy is proposed to estimate incipient faults while keeping the system stable even if MWPTS are affected by time delay and parameter uncertainty. Finally, the simulation result verified the availability of the incipient fault-tolerant method.