Implicit Quasi-Steady-State Approximation and Application to a Power Plant Evaporator

[+] Author and Article Information
Eduard Eitelberg1

Electrical, Electronic, and Computer Engineering, University of KwaZulu-Natal, Durban, 4041, South Africaeitelberg@ukzn.ac.za

Edward Boje

Electrical, Electronic, and Computer Engineering, University of KwaZulu-Natal, Durban, 4041, South Africaboje@ukzn.ac.za


Corresponding author.

J. Dyn. Sys., Meas., Control 129(1), 66-71 (May 24, 2006) (6 pages) doi:10.1115/1.2397153 History: Received June 21, 2005; Revised May 24, 2006

Construction of reduced order models using the conventional quasi-steady-state (QSS) or singular perturbation approach may not yield good low frequency approximations, especially if there is not a distinct time scale separation into slow and fast subsystems. An implicit QSS technique is proposed for general nonlinear models. The resulting reduced order model is accurate to first order in the perturbation parameter and its linearization is accurate to first order in frequency. An example is included showing the application of the proposed method to model reduction on a power plant evaporator.

Copyright © 2007 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 3

Simulation of once-through boiler with rate-limited step disturbance in feedwater (inlet) temperature (enthalpy) from 180°C to 220°C

Grahic Jump Location
Figure 1

A model with an identified fast component

Grahic Jump Location
Figure 2

Simulation of start-up of once-through boiler using quasi-steady-state model order reduction




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