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오환영(HWANYEONG OH),최윤영(YOON YOUNG CHOI),손영준(YOUNG-JUN SOHN) 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.3
Power converter are usually equipped for fuel cell power generation system to connect alternating current (AC) electric power grid. When converting direct current (DC) of fuel cell power source into AC, the power converter has a frequency ripple, which affects the fuel cell and the grid. Therefore, an equivalent circuit having dynamic characteristics of fuel cell power, for example, impedance, is useful for designing an inverter circuit. In this study, the current, voltage and impedance characteristics were calculated through fuel cell modeling and validated by comparing them with experiments. The equivalent circuit element values according to the current density were formulated into equations so that it could be applied to the circuit design. It is expected that the process of the equivalent circuit modeling will be applied to the actual inverter circuit design and simulated fuel cell power sources.
기체확산층의 마이크로다공층 구조 설계에 따른 고분자전해질형 연료전지의 성능 및 내구성에 관한 실험적 연구
오환영(Hwanyeong Oh),조준현(Junhyun Cho),박재만(Jaeman Park),민경덕(Kyoungdoug Min),정지영(Jy-Young Jyoung),이은숙(Eunsook Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The Gas Diffusion Layer(GDL) is a main component of a Polymer Electrolyte Membrane Fuel Cell(PEMFC) as a passage of not only hydrogen and air, used as fuels, but also water for humidifying membrane. Ion conductivity of Nafion<SUP>®</SUP> used as a membrane of PEMFC is proportional to amount of water in membrane. However, excessive water causes water flooding, which decreases the performance of a PEMFC by blocking pores in the GDL. Therefore, for enhanced performance of a PEMFC, it is important to concern how to design the micro porous layer (MPL) of the GDL, which is a key component for water management. Moreover, its durability has to be also considered for the commercialization of a PEMFC. In this study, as design parameters of MPL, a less hydrophobic MPL is inserted between the normal MPL and the substrate of the GDL, and the additional pore path is formed inside the MPL. Finally, the effects of these structural changes in the MPL on performance and durability are investigated.