Study Of Modeling And Thermal Management For Solid Oxide Fuel Cell System

As energy crises and environmental issues worsening, the study of fuel cell technology attracts great attention. High-Temperature solid oxide fuel cell(SOFC) is considered as one of the best development prospects of the 21st Century in the field of fuel cell, owning to its solid structure, high energy efficiency and extensive adaptability to all kinds of fuel gas (for instance, coal gas, natural gas, mixed gas.). At present, the study of SOFC mainly focuses on material and structures of stack. In the meantime, we need to emphasis on aspects like the design of controller, etc.In the thesis, firstly, the system structural framework of SOFC system is built from improving the utilization ratio of fuel and optimizing output performance of system. Based on modularization of SOFC system, mechanistic modes of each subsystem are constructed, and then all modules are integrated as a whole mechanistic mode of SOFC system. Secondly, based on stack mechanistic mode, the effects of stack temperature for system output performance are analyzed; the stack temperature control strategies of SOFC power generation system are studied thoroughly; and then the controllers which are based on PID control method and nonlinear predictive control method are designed. The simulation results of two control strategies demonstrate nonlinear predictive control method is more suitable for control of stack temperature. Finally,'V'development mode is introduced for controller development of SOFC power generation system, which is a new method for controller design.