| Summary: | 碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 97 === This thesis investigates the effect of load change on the voltage and current at the output terminals of Ballard Mark V PEMFC (proton exchange membrane fuel cell) and power converters used as the power source of autonomous underwater vehicles (AUVs) using Matlab/Simulink. Since the PEMFC produces dc output voltage that is easily affected by a load change and polarization losses, the PEMFC output terminals are connected to dc–dc converters for converting the unregulated voltage into desired voltage levels including 5-, 12-, 24- and 48-V in order to supply the AUVs’ loads. Moreover, the effect of load change between light load and full load on the voltages and currents at the PEMFC terminal and load terminal is analyzed in this study. In addition, the concept of control volume in the unsteady state mass and energy theory is applied to the fuel cell stack in order to understand the phenomenon in the cathode and anode channels which are difficult to obtain from measurements. This phenomenon includes the transient and steady state characteristics of the mass flow, pressures, temperatures occurred in a PEMFC.
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