Time-varying feedforward and output feedback controllers for nonlinear time-delay processes

The problem of output regulation of nonlinear time-delay processes with time-varying disturbances is considered. We present a new disturbance-dependent coordinate transformation for the linearization of nonlinear time-varying processes. In our proposed controller configuration, the modified Smith-type predictor plays the central role. Using this approach, the modified Smith-type predictor is composed of a nonlinear process model and a linear internal model. The presented feedforward and dead-time compensation can eliminate the effect of delayed disturbances on the output. With the aid of the incorporating linear internal model it aims to achieve both the asymptotic output regulation and the dead time compensation. A reduced-order controller structure for nonlinear time-delay processes can also asymptotically track the desired trajectory. Finally, the synthesis controllers are successfully implemented for chemical reactor systems.

[1]  A. Isidori,et al.  Output regulation of nonlinear systems , 1990 .

[2]  Dale E. Seborg,et al.  Time delay compensation for nonlinear processes , 1994 .

[3]  B. Wayne Bequette,et al.  Impact of process design on the multiplicity behavior of a jacketed exothermic CSTR , 1995 .

[4]  Prodromos Daoutidis,et al.  Synthesis of feedforward/state feedback controllers for nonlinear processes , 1989 .

[5]  M. A. Henson,et al.  An internal model control strategy for nonlinear systems , 1991 .

[6]  Costas Kravaris,et al.  Deadtime compensation for nonlinear processes , 1989 .

[7]  B. Bequette.  Nonlinear control of chemical processes: a review , 1991 .

[8]  Prodromos Daoutidis,et al.  Structural analysis and output feedback control of nonlinear multivariable processes , 1994 .

[9]  D. W. Bacon,et al.  Error trajectory descriptions of nonlinear controller designs , 1990 .

[10]  Prodromos Daoutidis,et al.  Output Feedback Controller Realizations for Open-loop Stable Nonlinear Processes , 1992, 1992 American Control Conference.

[11]  E. Sontag,et al.  Generalized Controller Canonical Forms for Linear and Nonlinear Dynamics , 1990 .

[12]  Masoud Soroush,et al.  Discrete‐time nonlinear controller synthesis by input/output linearization , 1992 .

[13]  Pasquale Lucibello,et al.  Output regulation of nonlinear systems evolving in the neighborhood of a periodic orbit , 1995, Autom..

[14]  C. Kravaris,et al.  Controller synthesis for time-varying systems by input/output linearization , 1997 .

[15]  Jan Sternby,et al.  A feedforward controller design for periodic signals in non-minimum phase processes , 1995 .

[16]  Prodromos Daoutidis,et al.  Feedforward/Output Feedback Control of Nonlinear Processes , 1993, 1993 American Control Conference.

[17]  P. Kokotovic,et al.  Feedback linearization of sampled-data systems , 1988 .

[18]  Costas Kravaris,et al.  Geometric methods for nonlinear process control. 2. Controller synthesis , 1990 .

[19]  A. B. Poore,et al.  On the dynamic behavior of continuous stirred tank reactors , 1974 .