Control of the washing zone in a continuous digester

Author

Funkquist, J.

Author_Institution

Dept. of Signal, Sensors, & Syst., R. Inst. of Technol., Stockholm, Sweden

fYear

1994

fDate

24-26 Aug 1994

Firstpage

513

Abstract

Multivariable temperature and alkali control in the washing zone of a continuous digester is considered. A linear model is identified from a nonlinear digester model, which is obtained by applying the method of orthogonal collocation to a model in terms of partial differential equations. The linear model is used for control design employing the Smith predictor in combination with an H_∞ robust stabilization procedure. Simulations using both the nominal and perturbed nonlinear models in combination with both a full and a reduced order controller are performed. Simulation studies show that the proposed control design approach is useful and may prove effective in digester control

Keywords

H^∞ control; control system synthesis; multivariable control systems; pH control; paper industry; partial differential equations; predictive control; robust control; temperature control; H_∞ robust stabilization; Smith predictor; alkali control; continuous digester; control design; full reduced order controller; linear model; nominal nonlinear model; nonlinear digester model; orthogonal collocation; partial differential equations; perturbed nonlinear models; reduced order controller; washing zone; H-infinity control; Multivariable systems; Partial differential equations; Predictive control; Pulp and paper industry; Robustness; Temperature control;

fLanguage

English

Publisher

ieee

Conference_Titel

Control Applications, 1994., Proceedings of the Third IEEE Conference on

Conference_Location

Glasgow

Print_ISBN

0-7803-1872-2

Type

conf

DOI

10.1109/CCA.1994.381429

Filename

381429