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Plant-wide Control of an Integrated SOFC Plant with Direct Thermal Coupling Scheme

Qazvinizadeh Esfehani, Amirhossein | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47389 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Pishvaie, Mahmoud Reza
  7. Abstract:
  8. Fuel cells are considered as one of the most promising for production of efficient and low-polluting electrical power. Hence, they can be a suitable alternative for fossil fuel sources. The solid oxide fuel cell (SOFC) is a direct conversion process, which works at high operating temperature (about 1000 °C). This high operating temperature makes them suitable for combining with gas turbines to achieve high overall fuel and power efficiency. A hybrid comportment consisting of an SOFC and a turbine (GT) is a multivariable nonlinear and strongly coupled system. On the other hand, total power generation in these systems which is a principal parameter should not be so sensitive to operating condition upsets. Otherwise, dynamic operability (and hence control) of the hybrid process will be a challenging issue. Accordingly, a detail dynamic model and control of pressurized SOFC/GT with direct coupling scheme is presented. Dynamic model of hybrid system is simulated in MATLAB Simulink and its performance in open circuit is discussed. Then with relative gain array (RGA) analysis, a suitable control pairing for input-output parameters due to set point tracking and load rejection is presented. Finally, a new pairing for load rejection purposes is presented and the performance of control system has been compared and justified
  9. Keywords:
  10. Solid Oxide Fuel Cell (SOFC) ; Control Structure ; Dynamic Simulation ; Hybrid System ; Integrated System

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