Nonlinear modeling and control for an evaporator unit
Journal article, Peer reviewed
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Original versionControl Engineering Practice. 2018, 78 24-34. 10.1016/j.conengprac.2018.06.006
This article presents a nonlinear modeling approach describing the enthalpy dynamics between the inlet of the economizer and the outlet of the evaporator in a once-through boiler. The model is used to design an LQG controller for the steam quality at the evaporator outlet and to estimate the firing power, which constitutes a disturbance to the process. Robustness properties of the overall controller design are evaluated and the results are presented in simulations utilizing a high-fidelity model acting as the real plant.