A generalized control scheme for system uncertainty estimation and cancellation. (September 2021)

• Record Type: Journal Article
• Authors: Wang, Qing-Guo; Liu, Tao; Nie, Zhuo-Yun; Hao, Shoulin; Ren, Xuhui; Zhang, Dan; Wang, Lei
• Other Names: Karimi Hamid Reza guest-editor.; Liang Bin guest-editor.; Basin Michael guest-editor.; Pan Huihui guest-editor.; Zeinali Meysar guest-editor.
• Is Part Of: Transactions of the Institute of Measurement and Control. Volume 43:Number 13(2021)
• Page Start: 2921
• Page End: 2933
• Publication Date: 2021-09
• Subjects: Uncertain systems -- robust control -- disturbance rejection -- extended state observer -- internal stability; Automatic control -- Periodicals; Measuring instruments -- Periodicals; Commande automatique -- Périodiques; Mesure -- Instruments -- Périodiques; 681.2
• DOI: 10.1177/01423312211010509
• Languages: English
• ISSNs: 0142-3312

Abstract

This paper addresses the control of a continuous-time system with possibly large uncertainty of unknown internal dynamics or external disturbance. A novel control scheme is proposed to estimate and cancel the system uncertainty effectively so as to enhance disturbance rejection (DR) performance. Unlike asymptotic analysis with infinite gain in the literature, the estimation transient analysis is carried out for the proposed scheme with a finite estimator gain and the precise error formulas are derived, based on a classical low-order plant description. The control performance associated with a realizable gain is quantified by tight bounds with respect to the ideal case, which enables easy parameter tuning. The necessary and sufficient condition for the internal stability of the control system is established, along with a D-decomposition method for determining the complete set of the gain intervals that could internally stabilize the plant. In the presence of measurement noise, a low-pass filter is introduced to attenuate its adverse effect. Simulations and semi-realistic experiments are performed to demonstrate the effectiveness of the proposed scheme, which shows evident improvement on DR performance over the well-known active DR control.