An improved U-control design for nonlinear systems represented by input/output differential models with a disturbance observer

Li, Ruobing; Zhu, Quanmin; Zhang, Weicun; Yue, Xicia; Narayan, Pritesh

Abstract

This paper presents a new method to calculate the inversion of the controlled linear/nonlinear dynamic plants which are described by input–output differential equation models. This new U-model-based inverter (U-inverter), cancels both system dynamics and nonlinearities, can be used directly to facilitate the control system design, which the design of U-model-based control (U-control) systems is selected for demonstration in this study. The most important advantage of this U-inverter is that it does not require system state variables, only uses the input/output measurements from the controlled plants. A nonlinear disturbance observer is introduced into the U-control design framework to increase its robustness. The analysis explains the properties of this developed the disturbance observer-based U-control (DOBUC) method and its design procedures. Finally, a wind energy conversion system is simulated to illustrate the design of this DOBUC and the corresponding performance.

• Journal Article Type: Article
• Acceptance Date: Aug 2, 2022
• Online Publication Date: Aug 18, 2022
• Publication Date: 2023
• Deposit Date: Oct 4, 2022
• Publicly Available Date: Nov 3, 2023
• Journal: International Journal of Control
• Print ISSN: 0020-7179
• Electronic ISSN: 1366-5820
• Publisher: Taylor & Francis
• Peer Reviewed: Peer Reviewed
• Volume: 96
• Issue: 11
• Pages: 2737-2748
• DOI: https://doi.org/10.1080/00207179.2022.2111370
• Keywords: Computer Science Applications, Control and Systems Engineering, U-model based control (U-control), disturbance observer (DOB), dynamic inversion, wind energy conversion system (WECS)
• Public URL: https://uwe-repository.worktribe.com/output/9943934
• Publisher URL: https://www.tandfonline.com/doi/full/10.1080/00207179.2022.2111370