Affine nonlinear control for an ultra-supercritical coal fired once-through boiler-turbine unit

Zhou, H, Chen, C, Lai, J, Lu, X, Deng, Q, Gao, X and Lei, Z 2018, 'Affine nonlinear control for an ultra-supercritical coal fired once-through boiler-turbine unit', Energy, vol. 153, pp. 638-649.

Document type: Journal Article
Collection: Journal Articles

Title Affine nonlinear control for an ultra-supercritical coal fired once-through boiler-turbine unit
Author(s) Zhou, H
Chen, C
Lai, J
Lu, X
Deng, Q
Gao, X
Lei, Z
Year 2018
Journal name Energy
Volume number 153
Start page 638
End page 649
Total pages 12
Publisher Elsevier
Abstract The ultra-supercritical once-through boiler (OTB) unit is an advanced power generation technology with high plant efficiency, high coal utilization, and low emission. However, it is difficult to realize a coordinate control for the ultra-supercritical OTB unit to achieve fast and stable dynamic response during load tracking and grid frequency disturbances, and its complexity and nonlinearity result in the ultra-supercritical OTB unit becoming a multiple-input and multiple-output system filled with severe coupling and interference. According to the affine nonlinear system theory, a nonlinear control method is developed to solve nonlinear decoupled optimal control problems of a nonlinear ultra-supercritical OTB unit. Firstly, the exact linearization technique is used to transform the nonlinear ultra-supercritical OTB system into a linear one and an optimal LQR is designed for the corresponding nominal system. The optimal nonlinear control law can be derived by coordinate conversion and condition feedback and the study can be conducted for reasonable experiments and analysis. Then, compared with the linear PID control and model predictive control, the effectiveness and superiority of the proposed nonlinear optimal control have been verified through different loads disturbances from 50% to 100% using the Matlab/Simulink Toolbox.
Subject Resources Engineering and Extractive Metallurgy not elsewhere classified
Interdisciplinary Engineering not elsewhere classified
Mechanical Engineering not elsewhere classified
Keyword(s) Affine nonlinear systems
Nonlinear optimal control
State feedback exact liberalization
Ultra-supercritical once-through boiler
DOI - identifier 10.1016/
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0360-5442
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