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Design and Comparison of an Adaptive and Robust Control Strategy to Improve the Boiler-Turbine unit Performance and Reduction of Make-Up Water

Ghabraei, Soheil | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47632 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moradi, Hamed; Vossoughi, Gholamreza
  7. Abstract:
  8. There is many sources of uncertainty in the power plants such as continuous changes of the ambient temperature and the climate condition. The controller of the boiler-turbine unite should be robust against uncertainties and overcome the changes in the operating condition. In this regard, a robust adaptive variable structure control scheme (RAVCS) is proposed to control a nonlinear multi-input multi-output (MIMO) model of industrial boiler-turbine unite, in the presence of unknown parameters and bounded uncertainties as well as external disturbances. Moreover, a robust controller based on and in the presence of rational deviation in parameters, is designed. To investigate the zero dynamics and control ability via the nonlinear techniques, input-output linearization is performed. Appropriate adaption laws are introduced to tackle the parameter uncertainty and modeling the imprecisions as well as external disturbances. Appropriate control laws are introduced to guarantee the convergence to the sliding surface. Then, the robustness and stability of the proposed RAVCS is proved via Lyapunov stability theory. To investigate the performance of proposed control schemes, simulation studies are carried out on a realistic nonlinear model in the presence of mentioned uncertainties. Comparison between results reveals the satisfactory performance of the both proposed controllers even against the large uncertainties. However, the overall performance of the was better the in comparison with RAVCScontroller
  9. Keywords:
  10. Multivariable Control ; Robust-Adaptive Schemes ; Boiler-Turbine Unit ; Parameters Uncertainty ; Robust Performance

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