Application of enhanced LQG/LTR for distillation control

Author

Zhou, C. ; Whiteley, J.R. ; Misawa, E.A. ; Gasem, K.A.M.

Author_Institution

Sch. of Chem. Eng., Oklahoma State Univ., Stillwater, OK, USA

Volume

15

Issue

4

fYear

1995

fDate

8/1/1995 12:00:00 AM

Firstpage

56

Lastpage

63

Abstract

O´Dell and Misawa (1995) proposed a modification to the traditional LQG/LTR design procedure which provides uniform singular values across all frequencies for the target loop. The modification is easy to implement and significantly improves the performance of the LQG/LTR compensator. This article explores applicability of the technique for distillation column control, the most common multivariable control problem in the process industries. When applied to the Wood/Berry column (1973), performance of the enhanced LQG/LTR compensator is found to be comparable to a MAC model predictive controller and significantly better than traditional SISO PI control. Despite the lack of guaranteed performance and robust stability for nonlinear, nonminimum phase plants, the results suggest further consideration of enhanced LQG/LTR for application in the process industries

Keywords

chemical industry; compensation; distillation; linear quadratic Gaussian control; multivariable control systems; LQG/LTR compensator; distillation control; enhanced LQG/LTR; multivariable control; nonlinear nonminimum phase plants; uniform singular values; Control systems; Distillation equipment; Feedback loop; Frequency; Industrial control; Optimal control; Predictive control; Predictive models; Process control; Robust stability;

fLanguage

English

Journal_Title

Control Systems, IEEE

Publisher

ieee

ISSN

1066-033X

Type

jour

DOI

10.1109/37.408460

Filename

408460