An auxiliary LQG/LTR robust controller design for cogeneration plants

Author

Young-Moon Park ; Myoen-Song Choi ; Jeong-Woo Lee ; Lee, Khuan Y.

Author_Institution

Dept. of Electr. Eng., Seoul Nat. Univ., South Korea

Volume

11

Issue

2

fYear

1996

fDate

6/1/1996 12:00:00 AM

Firstpage

407

Lastpage

413

Abstract

A robust controller is designed to reduce the sensitivity of the frequency and the extraction steam pressure to the disturbance imposed on a cogeneration plant by using the LQG/LTR (linear quadratic Gaussian/loop transfer recovery) methodology. The natural frequency of the generator swing is analyzed to determine the frequency band of the disturbance due to the variation in load and utilized as a design specification for the LQG/LTR controller. The singular-value Bode diagram of the sensitivity transfer function matrix is shaped to reduce disturbance effects on the power system frequency and steam pressure according to the design specification. The high order LQG/LTR controller is reduced to a low order controller and implemented in a nonlinear cogeneration plant model. Simulation shows the performance of the LQG/LTR controller in disturbance rejection

Keywords

Bode diagrams; cogeneration; control system synthesis; controllers; linear quadratic Gaussian control; power station control; robust control; sensitivity; transfer function matrices; auxiliary LQG/LTR robust controller design; cogeneration plants; disturbance effects reduction; disturbance rejection; extraction steam pressure reduction; frequency sensitivity reduction; linear quadratic Gaussian control; loop transfer recovery control; low order controller; nonlinear cogeneration plant model; power system frequency; sensitivity transfer function matrix; singular-value Bode diagram; Cogeneration; Energy resolution; Frequency; Power system analysis computing; Power system modeling; Power system simulation; Pressure control; Robust control; Robust stability; Transfer functions;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/60.507653

Filename

507653