Discrete-time domain two-degree-of-freedom control design for integrating and unstable processes with time delay

A discrete-time domain two-degree-of-freedom (2DOF) design method is proposed for integrating and unstable processes with time delay. Based on a 2DOF control structure recently developed, a controller is analytically designed in terms of the H2 optimal control performance specification for the set-p...

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Veröffentlicht in:ISA transactions 2016-07, Vol.63, p.121-132
Hauptverfasser: Wang, Dong, Liu, Tao, Sun, Ximing, Zhong, Chongquan
Format: Artikel
Sprache:eng
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Zusammenfassung:A discrete-time domain two-degree-of-freedom (2DOF) design method is proposed for integrating and unstable processes with time delay. Based on a 2DOF control structure recently developed, a controller is analytically designed in terms of the H2 optimal control performance specification for the set-point tracking, and another controller is derived by proposing the desired closed-loop transfer function for load disturbance rejection. Both controllers can be tuned relatively independent to realize control optimization. Analytical expression of the set-point response is given for quantitatively tuning the single adjustable parameter in the set-point tracking controller. At the meantime, sufficient and necessary conditions for holding robust stability of the closed-loop control system are established for tuning another adjustable parameter in the disturbance rejection controller, along with numerical tuning guidelines. Illustrative examples from the literature are used to demonstrate the effectiveness of the proposed method. •A discrete-time domain two-degree-of-freedom (2DOF) control design for integrating and unstable systems with long time delay.•The H2 optimal control performance for the set-point tracking.•Desired closed-loop transfer function for load disturbance rejection.•Both the set-point tracking response and load disturbance rejection response can be tuned separately in a monotonic manner through a single adjustable parameter.
ISSN:0019-0578
1879-2022
DOI:10.1016/j.isatra.2016.03.017