• Title, Summary, Keyword: Fuel Cell System

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A study on Fuel Cell generation system (연료전지 발전시스템에 관한 연구)

  • Jeong, Dong-Hyo
    • Proceedings of the KIEE Conference
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    • pp.77-78
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    • 2008
  • Recently, a fuel cell is remarkable for new generation system. The fuel cell generation system converts the chemical energy of a fuel directly into electrical energy. The fuel cell generation is characterized by low voltage and high current. For connecting to utility, it needs both a step up converter and an inverter. The step up converter makes DC link and the inverter changes DC to AC. In this paper, full bridge converter and the single phase inverter are designed and installed for fuel cell. Simulation and experiment verify that fuel cell generation system could be applied for the distributed generation. In this paper, the 1.5kW active clamp current-fed full bridge converter employing MOSFETs is operated to discharge the battery whereas a voltage-fed half bridge converter employing IGBTs is operated to charge the battery.

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Technical Trends for Fuel Cell Aircraft (연료전지항공기 기술 동향)

  • Kim, Keun-Bae
    • Current Industrial and Technological Trends in Aerospace
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    • v.7 no.2
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    • pp.95-105
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    • 2009
  • Fuel cells are applied to the propulsion system of aircraft based on environmental-friendly characteristics with low noise and zero emission of CO2, currently many kinds of UAV and small manned aircraft equipped with fuel cells are being developed. Fuel cells for aircraft typically classified into PEMFC(Proton Exchange Membrane Fuel Cell) type and SOFC(Solid Oxide Fuel Cell) type and the system is developed to adapt missions and operational conditions of aircraft. For UAV, various types of aircraft mostly based on PEM fuel cell technology are investigated for military or commercial uses, and the stability and endurance of system will be improved. For small manned aircraft, many researches are carried out to substitute the propulsion system by fuel cell, also some developments for the higher performance of APU of large commercial aircraft to apply fuel cells are in progress. In the future, a fuel cell aircraft will be expected to improve the reliability and efficiency with higher power density.

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Development of Fuel Cell Power System for Unmanned Aerial Vehicle (무인 항공기용 연료 전지 동력 시스템 개발)

  • Kim, Tae-Gyu;Shim, Hyun-Chul;Kwon, Se-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.87-90
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    • 2007
  • Fuel cell power system was developed for high-endurance unmanned aerial vehicle (UAV). Liquid chemical hydride was selected as a fuel due to its high energy density. Liquid storage of the fuel is an ideal alternative solution of the existing compressed hydrogen storage. The fueling system that extracts hydrogen from chemical hydride consists of catalytic reactor, micro-pump, fuel cartridge, separator, and controller. The fuel cell power system including the fueling system and the fuel cell that generates electricity was integrated into a proposed UAV. The performance verification of the fuel cell power system was performed to use as a power plant of the UAV.

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Analysis of the FuelCell Battery Hybrid Power System (연료전지 축전지 복합 동력원의 구동 특성)

  • Lee, Bong-Do;Shin, Dong-Ryul
    • Proceedings of the KIEE Conference
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    • pp.1322-1324
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    • 2001
  • FuelCell/Battery hybrid power systems were studied to develop high efficient zero-emission fuel cell electric vehicles. Fuel cells were used as an auxiliary energy source and batteries were used as a transient power source. The fuel cell system is used to supply the average power demand. Dynamic response of the hybrid systems was simulated using PSPICE program and also tested experimentally. The results can be used to design the interface module and to determine the power requirement between the fuel cell unit and the battery pack.

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Load Analysis of the FuelCell/Battery Hybrid Power System (연료전지 축전지 하이브리드 동력원의 접속 특성 분석)

  • Lee, Bong-Do;Lee, Won-Yong
    • Proceedings of the KIEE Conference
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    • pp.3081-3083
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    • 2000
  • Fuel cell/battery hybrid power systems were studied to develop high efficient zero-emission fuel cell electric vehicles, Fuel cells were used as an auxiliary energy source and batteries were used as a transient power source. The fuel cell system is used to supply the average power demand. Dynamic response of the hybrid systems was simulated using PSPICE program and also tested experimentally, The results can be used to design the interface module and to determine the power requirement between the fuel cell unit and the battery pack.

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Performance Characteristics of Direct Methanol Fuel Cell with Methanol Concentration (메탄올 농도에 따른 직접 메탄올 연료전지의 성능 해석)

  • Cho, Chang-Hwan;Kim, Yong-Chan;Chang, Young-Soo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.3
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    • pp.197-204
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    • 2008
  • DMFC(Direct Methanol Fuel Cell) is one of promising candidates for power sources of small mobile IT devices like notebook, cell phone, and so on. Efficient operation of fuel cell system is very important for long-sustained power supply because of limited fuel tank size. It is necessary to investigate operation characteristics of fuel cell stack for optimal control of DMFC system. The generated voltage was modeled according to various operating condition; methanol concentration, stack temperature, and load current. It is inevitable for methanol solution at anode to cross over to cathode through MEA(membrane electrode assembly), which reduces the system efficiency and increases fuel consumption. In this study, optimal operation conditions are proposed by analyzing stack performance model, cross-over phenomenon, and system efficiency.

Development of Air Cutoff Valve for Improving Durability of Fuel Cell (연료전지 내구성능 향상을 위한 공기차단밸브 개발)

  • Park, Jeonghee;Lee, Changha;Kwon, Hyuckryul;Kim, Chimyung;Choi, Kyusung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.1
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    • pp.49-55
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    • 2015
  • In this study, among in various scenarios of the duration degradation of the fuel cell, countermeasures for the cathode carbon carrier oxidation and the deactivation of catalyst by hydrogen / air interface formation have been studied. so the system was applied to the air cutoff valve. In terms of the component, the cold start performance, electrical stability, the airtight performance were mainly designed and their performance was confirmed. And in terms of the system, the air electrode flow is blocked off, so the oxygen concentration drops when system is powered off, As a result, By reducing unit cell voltage which affect the durability of the fuel cell reached up to 0.8V, the improved durability of the fuel cell was confirmed.

Study on Soft-Switching Transformers Inductor Boost Converter for Fuel Cell Powered Railway Vehicle

  • Jung, No-Geon;Kim, Jae-Moon
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2553-2560
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    • 2018
  • In Korea, there are no instances where a hydrogen fuel cell power generation system has been used in a railway vehicle. Only the basic topology has been studied. In the previous study, conventional converters using a single switch were applied to the fuel cell power generation system. Therefore, current stress on the switch at converter on-off transitions would be large when controlling a large-capacity railway vehicle. In addition, since the input side ripple is also large, there is a problem with a shortening of the lifetime of both the fuel cell power generation system and the inductor. In this paper, a soft-switching transformer inductor boost converter for fuel cell powered railway vehicles was proposed. A technique to reduce both the switching current stress generated during on-off transitions, and the input ripple current flowing in the inductor were studied. The soft-switching TIB converter uses a transformer-type inductor to configure the entire circuit in an interleaved method, and reduces both input current ripple and the current ripple of the inductor and switch.

Analysis of Performance Characteristics of Gas Turbine-Pressurized SOFC Hybrid Systems Considering Limiting Design Factors (제한요소를 고려한 가스터빈-가압형 SOFC 하이브리드 시스템의 성능특성 해석)

  • Yang Won Jun;Kim Tong Seop;Kim Jae Hwan
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.11
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    • pp.1013-1020
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    • 2004
  • The hybrid system of gas turbine and fuel cell is expected to produce electricity more efficiently than conventional methods, especially in small power applications such as distributed generation. The solid oxide fuel cell (SOFC) is currently the most promising fuel cell for the hybrid system. To realize the conceptual advantages resulting from the hybridization of gas turbine and fuel cell, optimized construction of the whole system must be the most important. In this study, parametric design analyses for pressurized GT/SOFC systems have been peformed considering probable practical limiting design factors such as turbine inlet temperature, fuel cell operating temperature, temperature rise in the fuel cell and soon. Analyzed systems include various configurations depending on fuel reforming type and fuel supply method.

Development and Demonstration of 150W Fuel Cell Propulsion System for Unmanned Aerial Vehicle (UAV) (무인항공기용 150W급 연료전지 동력원 개발 및 실증)

  • Yang, Cheol-Nam;Kim, Yang-Do
    • Transactions of the Korean hydrogen and new energy society
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    • v.23 no.4
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    • pp.300-309
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    • 2012
  • Long endurance is a key issue in the application of unmanned aerial vehicles. This study presents feasibility test results when fuel cell system as an alternative to the conventional engine is applied for the power of the UAV after the 150W fuel cell system is developed and packaged to the 1/4 scale super cub airplane. Fuel cell system is operated by dead-end method in the anode part and periodically purged to remove the water droplet in flow field during the operation. Oxygen in the air is supplied to the stack by the two air blowers. And fuel cell stack is water cooled by cooling circuit to dissipate the heat generated during the fuel cell operation. Weight balance is considered to integrate the stack and balance of plant (BOP) in package layout. In flight performance test, we demonstrated 4 times standalone take-off and landing. In the laboratory test simulating the flight condition to quantify the energy flow, the system is analyzed in detail. Sankey diagram shows that electric efficiency of the fuel cell system is 39.2%, heat loss 50.1%, parasitic loss 8.96%, and unreacted purged gas 1.67%, respectively compared to the total hydrogen input energy. Feasibility test results show that fuel cell system is high efficient and appropriate for the power of UAV.