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Control-oriented modeling and analysis of direct energy balance in coal-fired boiler-turbine unit

Authors :
Yali Xue
Kwang Y. Lee
Donghai Li
Li Sun
Source :
Control Engineering Practice. 55:38-55
Publication Year :
2016
Publisher :
Elsevier BV, 2016.

Abstract

Direct energy balance (DEB) coordinated control scheme is widely used by field engineers in coal-fired power plants while attracting little attention in the academic community. This paper aims to derive a mathematical model that is suitable for DEB research. To balance the model’s fidelity and simplicity, the power plant is divided into three transformation modules and, using conservation laws, a dynamic model is developed to describe each module. Within reasonable assumptions, numerous module equations are combined to yield a 6th-order nonlinear model. Time constants of the model are identified based on Pareto optimization. Model accuracy is confirmed using field measurements from a 300 MW coal-fired power plant. Based on the linearized model, the merits of the DEB control structure are analyzed. It is confirmed that the DEB control is sufficient to fulfill the fundamental goals of power plant regulation. An illustration of performance improvement is given by introducing gain scheduling techniques to the DEB structure. The proposed model can provide groundwork for future development of advanced control algorithms under the DEB structure.

Details

ISSN :
09670661
Volume :
55
Database :
OpenAIRE
Journal :
Control Engineering Practice
Accession number :
edsair.doi...........cbe81607c53edffc333cd4d91a3fb2c0
Full Text :
https://doi.org/10.1016/j.conengprac.2016.06.013