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Control of a nonlinear boiler- turbine unit using two methods: Gain scheduling & feedback linearization

Moradi, H ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1115/IMECE2007-42945
  3. Publisher: 2008
  4. Abstract:
  5. To achieve a good performance of a boiler-turbine unit, dynamic variables such as steam pressure, water level of drum and electric output of turbine must be controlled. In this paper a nonlinear model of the boiler-turbine unit is considered in which the inputs are the valve positions of fuel flow, steam control, and feed-water flow. Using two control methods, feedback linearization and gain scheduling, a PI controller is designed. It is shown that by applying both methods, system goes from one operating point to another with an appropriate specification of time response. Results show that system with a controller designed based on gain scheduling method has a better time response from a nominal operating point to a far operating point. In addition, applying any of these control approaches guarantees robustness of the system against the uncertainties associated with dynamic model. Copyright © 2007 by ASME
  6. Keywords:
  7. Time response ; Boiler turbine units ; Control approach ; Dynamic variables ; Electric output ; Gain Scheduling ; Nominal operating point ; Non-linear model ; Operating points ; Control system analysis ; Dynamic models ; Gain control ; Scheduling ; Boilers ; Controllers ; Dynamics ; Flow of water ; Linearization ; MIMO systems ; Nonlinear feedback ; Turbines ; Water levels ; Nonlinear systems ; Feedback linearization
  8. Source: ASME International Mechanical Engineering Congress and Exposition, IMECE 2007, Seattle, WA, 11 November 2007 through 15 November 2007 ; Volume 9 PART A , 2008 , Pages 491-499 ; 0791843033 (ISBN); 9780791843031 (ISBN)
  9. URL: https://asmedigitalcollection.asme.org/IMECE/proceedings-abstract/IMECE2007/43033/491/329014