On exploiting inexact scheduling parameters for gain-scheduled control of linear parameter-varying discrete-time systems

• Published in: Systems & control letters 2018-07, Vol.117, p.1-10
• Main Author: Sadeghzadeh, Arash
• Format: Article
• Language: English
• Subjects: Bounded variation rate; Discrete-time system; Gain-scheduled controller; Induced [formula omitted]-gain performance; Inexact scheduling parameters; Parameter-varying system
• ISSN: 0167-6911; 1872-7956
• DOI: 10.1016/j.sysconle.2018.04.012

This paper is concerned with the problem of gain-scheduled controller design for parameter-varying discrete-time systems. In practice, the scheduling parameters are only available with limited accuracy due to the measurement errors. In the present paper, these uncertainties are systematically taken into account for the gain-scheduled controller synthesis to achieve improved performance in practical situations. It is assumed that all the matrices of the state-space model of the plant have a homogeneous polynomial dependency of arbitrary degree on the scheduling parameters. The merit of the proposed method is its capability in dealing with the measurement error less conservatively than available approaches while it can also encompass the traditional methods employing the exact scheduling parameters in a less conservative manner. A comprehensive numerical example demonstrates the effectiveness of the proposed method.