| Summary: | 碩士 === 國立勤益科技大學 === 電機工程系 === 98 === In the electricity generation system of the fuel cell, the dynamic respond of fuel cell is extremely important for the system control and management. It also affects the electric power quality. Therefore, estiblishing a relatively reliable mathematics model to analyze the dynamic characteristic of the small-scale electricity generation system of fuel cell can reduce the system design cost and time. The fuel cell are mainly divided into five types. This paper researchs and analyzes the proton exchange membrane fuel cell(PEMFC) with the low temperature. Utilizing the experience formula of the PEMFC to build the MATLAB/Simulinksimulation, we analyze the steady-state respond and dynamic respond of the PEMFC. In order to contribute to the output control design of PEMFC stack, the effects of the operate parameters on the PEMFC output are first analyzed. The relation between the gas pressure and the output voltage is realized. According to the ideal gas law, the gas pressure is in direct proportion to the flow rate. The input/output feedback linearization control method is proposed. The error value is feedback into the output rate of the reformer. The gas pressure of controlling the fuel cell stack is then reached and the output voltage is controlled to the goal value.
In order to understand the PEMFC as a power source to supply power for AC network, we use the SimpowerSystem electric electronic element of MATLAB/Simulink to built the DC/DC converter and DC/AC inverter which convert the output direct current of PEMFC to the alternating current to supply power for AC network. When the electric electronic elements are simulated in computer, due to both the solver relation to step time and difficulty for the parameter to determine, it makes simulation time often needed to consume a long time. Therefore, we propose a Simplified DA/AC inverter model. The results show that it is roughly the same with the electric electronic element. It has proved the feasibility of this model.
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