• Title/Summary/Keyword: Fuel Cell

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Power System of Fuel Cell Tram (연료전지궤도차량의 동력시스템)

  • Chang, Seky;Mok, Jai-Kyun;Lim, Tae-Hoon
    • Proceedings of the KSR Conference
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    • pp.320-325
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    • 2005
  • Power of fuel cell tram is supplied by only fuel cell system or hybrid system of fuel cell and battery/super capacity. Fuel cell is operated by hydrogen, which is fed directly from hydrogen tank or by reforming gasoline or methanol into hydrogen. Power system is preferred with hybrid of fuel cell and battery/super capacity since it improves total energy efficiency through interaction of hybrid components and restores energy regenerated by braking. Also, power supply system by fuel cell hybrid should be designed to output optimum energy efficiency depending on driving mode of fuel cell tram.

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Development of Bifunctional Electrocatalyst for PEM URFC (고분자 전해질 막을 이용한 일체형 재생 연료전지용 촉매전극 개발)

  • Yim, Sung-Dae;Park, Gu-Gon;Sohn, Young-Jun;Yang, Tae-Hyun;Yoon, Young-Gi;Lee, Won-Yong;Kim, Chang-Soo
    • Transactions of the Korean hydrogen and new energy society
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    • v.15 no.1
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    • pp.23-31
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    • 2004
  • For the fabrication of high efficient bifunctional electrocatalyst of oxygen electrode for PEM URFC (Polymer Electrolyte Membrane Unitized Regenerative Fuel Cell), which is a promising energy storage and conversion system using hydrogen as the energy medium, several bifunctional electrocatalysts were prepared and tested in a single cell URFC system. The catalysts for oxygen electrode revealed fuel cell performance in the order of Pt black > PtIr > PtRuOx > PtRu ~ PtRuIr > PtIrOx, whereas water electrolysis performance in the order of PtIr ~ PtIrOx > PtRu > PtRuIr > PtRuOx ~ Pt black. Considering both reaction modes PtIr was the most effective elctrocatalyst for oxygen electrode of present PEM URFC system. In addition, the water electrolysis performance was significantly improved when Ir or IrOx was added to Pt black just 1 wt.% without the decrease of fuel cell performance. Based on the catalyst screening and the optimization of catalyst composition and loading, the optimum catalyst electrodes for PEM URFC were $1.0mg/cm^2$ of Pt black as hydrogen electrode and $2.0mg/cm^2$ of PtIr (99:1) as oxygen electrode.

Development of the Hydrogen Recirculation System for Fuel Cell Hybrid Vehicle (연료전지 하이브리드 자동차의 고효율 수소 재순환 시스템의 개발)

  • Kim, Min-Jin;Sohn, Young-Jun;Kim, Kyoung-Youn;Lee, Won-Yong
    • Transactions of the Korean hydrogen and new energy society
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    • v.19 no.2
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    • pp.118-123
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    • 2008
  • For the hydrogen recirculation system of the PEMFC (polymer electrolyte membrane fuel cell), the ejector is useful to improve the efficiency of the fuel cell system. However, conventional ejector does not keep its entrainment ratio good when the various power duties is required by the fuel cell system. In this study, the variable multi-ejector acceptable in the whole duty range required from the fuel cell hybrid mini-bus is developed. Consequently, the performance of the developed ejector is verified by the experiments based on the real operating conditions.

A Power Control Scheme of a Fuel Cell Hybrid Power Source

  • Song, Yu-Jin;Han, S.B.;Park, S.I.;Jeong, H.G.;Jung, B.M.;Kim, G.D.;Yu, S.W.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.183-187
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    • 2008
  • This paper describes a power control scheme to improve the performance of a fuel cell battery hybrid power source for residential application. The proposed power control scheme includes a power control strategy to control the power flow of the fuel cell hybrid power system and a digital control technique for a front-end dc-dc converter of the fuel cell. The power control strategy enables the fuel cell to operate within the high efficiency region defined by the polarization curve and efficiency curve of the fuel cell. A dual boost converter with digital control is applied as a front-end dc-dc converter to control the fuel cell output power. The digital control technique of the converter employs a moving-average digital filter into its voltage feedback loop to cancel the low frequency harmonic current drawn from the fuel cell and then limits the fuel cell output current to a current limit using a predictive current limiter to keep the fuel cell operation within the high efficiency region as well as to minimize the fuel cell oxygen starvation.

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Development of An Accelerated Durability Test Mode for Fuel Cell (연료전지 가속내구모드 개발)

  • LEE, YONGHEE;OH, DONGJO;JEON, UISIK;LEE, JONGHYUN
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.5
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    • pp.493-498
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    • 2015
  • The fuel cell vehicle is a type of hydrogen vehicle which uses a fuel cell to produce electricity, powering its on-board electric motor. The fuel cell vehicle driving principle is completely different from the internal combustion engine vehicle. In order to ensure the durable quality of the fuel cell vehicle, durability test mode considering the characteristics of the fuel cell must be developed. In this study, we derived the durability test mode profile through collecting and analyzing fuel cell vehicle driving data. Then, the accelerated durability test mode is developed by adding degradation conditions and is experimentally validated to have an acceleration factor of 5~6.

A Study on the Operation Condition by Electrical Fault in the High Temperature Fuel Cell Plant (고온 연료전지 발전단지의 내부계통 고장에 의한 운전환경에 대한 분석)

  • Chong, Young-Whan;Chai, Hui-Seok;Kim, Jae-Chul;Cho, Sung-Min
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.8
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    • pp.51-59
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    • 2013
  • High temperature fuel cell system, such as molten carbonate fuel cells(MCFC) and solid oxide fuel cells(SOFC), are capable of operating at MW rated power output. The power output change of high temperature fuel cell imposes the thermal and mechanical stresses on the fuel cell stack. To minimize the thermal-mechanical stresses on the stack, increases in the power output of high temperature fuel cell typically must be made at a slow rate. So, the short time interruption of high temperature fuel cell causes considerable generated energy losses. Because of the characteristic of high temperature fuel cell, we analyzed the impact of electrical fault in the fuel cell plant on other fuel cell generators in the same plant site. A various grounding configuration and voltage sag are analyzed. Finally, we presented the solution to minimize the effect of fault on other fuel cell generators.

Cell Voltage Monitoring of PEMFC Power Module for Fuel Cell Electric Vehicle (연료전지 차량용 PEMFC 발전모듈의 셀전압 측정)

  • Park Hyunseok;Jeon Ywunseok;Ku Bonwoong;Choi Seoho
    • 한국신재생에너지학회:학술대회논문집
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    • pp.388-391
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    • 2005
  • In this paper, Cell voltage monitoring method is studied for fault detection of PEMFC(Proton Exchange Membrane Fuel Cell) for FCEV(fuel cell electric vehicle). To measuring several hundred of cells in fuel cell stack, The demanded feature of hardware and software is studied and several types are analysed. Finally, $3.26\%$ maximum measuring error is acquired and verified experimentally.

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DEVELOPMENT OF FUEL CELL HYBRID ELECTRIC VEHICLE PERFORMANCE SIMULATOR

  • Park, C.;Oh, K.;Kim, D.;Kim, H.
    • International Journal of Automotive Technology
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    • v.5 no.4
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    • pp.287-295
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    • 2004
  • A performance simulator for the fuel cell hybrid electric vehicle (FCHEV) is developed to evaluate the potentials of hybridization for fuel cell electric vehicle. Dynamic models of FCHEV's electric powertrain components such as fuel cell stack, battery, traction motor, DC/DC converter, etc. are obtained by modular approach using MATLAB SIMULINK. In addition, a thermodynamic model of the fuel cell is introduced using bondgraph to investigate the temperature effect on the vehicle performance. It is found from the simulation results that the hybridization of fuel cell electric vehicle (FCEV) provides better hydrogen fuel economy especially in the city driving owing to the braking energy recuperation and relatively high efficiency operation of the fuel cell. It is also found from the thermodynamic simulation of the FCEV that the fuel economy and acceleration performance are affected by the temperature due to the relatively low efficiency and reduced output power of the fuel cell stack at low temperature.