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Improving the performance of a nonlinear boiler–turbine unit via bifurcation control of external disturbances: a comparison between sliding mode and feedback linearization control approaches

Moradi, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s11071-016-2680-x
  3. Publisher: Springer Netherlands
  4. Abstract:
  5. Boiler–turbine units may show quasiperiodic behavior due to the bifurcation occurrence in the presence of harmonic disturbances. In this study, a multi-input–multi-output nonlinear dynamic model of a boiler–turbine unit is considered. Drum pressure, electric output, and fluid density are the state variables and adjusted at the desired values by manipulation of the input variables. Control inputs are the valve positions for fuel, steam and feed-water flow rates. To improve the quasiperiodic behavior of the system and bifurcation control in tracking problem, two controllers are designed: feedback linearization control and nonlinear sliding mode control (SMC). The feedback linearization controller is designed based on the linearized dynamics. Dynamic response of the system in tracking of four different desired trajectories is examined. SMC controller acts more efficiently in suppression of harmonic perturbations and consequently bifurcation control. Appropriate tracking performance is observed for the drum pressure, electric output, fluid density and drum water level in both cases. Control efforts’ magnitudes in both controllers are almost similar. However, sliding mode controller vanishes the quasiperiodic solutions more successfully and leads to a more smooth response with less overshoots and less corresponding control efforts
  6. Keywords:
  7. Nonlinear dynamics ; Tracking objectives ; Bifurcation (mathematics) ; Boiler control ; Boilers ; Controllers ; Dynamics ; Flow of water ; Linearization ; Nonlinear feedback ; Sliding mode control ; Spatial variables control ; Turbines ; Water levels ; Bifurcation control ; Feedback linearization control ; Feedback linearization controllers ; Harmonic perturbations ; Nonlinear sliding mode ; Quasi-periodic solution ; Quasiperiodic behavior ; Sliding mode controller ; Feedback linearization
  8. Source: Nonlinear Dynamics ; Volume 85, Issue 1 , 2016 , Pages 229-243 ; 0924090X (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11071-016-2680-x