title: Discrete-time domain two-degree-of-freedom control design for integrating and unstable processes with time delay.
abstract: 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.
authors.affiliation: Institute of Advanced Control Technology, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.affiliation: Institute of Advanced Control Technology, Dalian University of Technology, Dalian 116024, PR China. Electronic address: liurouter@ieee.org.
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.affiliation: Institute of Advanced Control Technology, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Ximing
authors.initials: X
authors.lastname: Sun
authors.affiliation: Institute of Advanced Control Technology, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Chongquan
authors.initials: C
authors.lastname: Zhong
keywords: Controller design; Discrete-time domain; Integrating and unstable processes; Robust stability; Time delay; Two-degree-of-freedom control