• 제목, 요약, 키워드: Fuel Cell System

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가정용 고분자연료전지 시스템의 운전 방법에 따른 성능 비교 (Operation Performance of a Polymer Electrolyte Fuel Cell Cogeneration System for Residential Application)

  • 이원용;정귀성;유상필;엄석기;김창수
    • 한국수소및신에너지학회논문집
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    • v.16 no.4
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    • pp.364-371
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    • 2005
  • Fuel cell systems(FCS) have a financial and environmental advantage by providing electricity at a high efficiency and useful heat. For use in a residence, a polymer electrolyte fuel cell system(PEFCS) with a battery pack and a hot water storage tank has been modelled and simulated. The system is operated without connection to grid line. Its electric conversion efficiency and heat recovery performance are highly dependent on operation strategies and also on the seasonal thermal and electric load pattern. The output of the fuel cell is controlled stepwise as a function of the state of the battery and/or the storage water tank. In this study various operation strategies for cogeneration fuel cell systems are investigated. Average fuel saving rates at different seasons are calculated to find proper load management strategy. The scheme can be used to determine the optimal operating strategies of PEFCS for residential and building applications.

Maximum Efficiency Point Tracking Algorithm Using Oxygen Access Ratio Control for Fuel Cell Systems

  • Jang, Min-Ho;Lee, Jae-Moon;Kim, Jong-Hoon;Park, Jong-Hu;Cho, Bo-Hyung
    • Journal of Power Electronics
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    • v.11 no.2
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    • pp.194-201
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    • 2011
  • The air flow supplied to a fuel cell system is one of the most significant factors in determining fuel efficiency. The conventional method of controlling the air flow is to fix the oxygen supply at an estimated constant rate for optimal efficiency. However, the actual optimal point can deviated from the pre-set value due to temperature, load conditions and so on. In this paper, the maximum efficiency point tracking (MEPT) algorithm is proposed for finding the optimal air supply rate in real time to maximize the net-power generation of fuel cell systems. The fixed step MEPT algorithm has slow dynamics, thus it affects the overall efficiency. As a result, the variable step MEPT algorithm is proposed to compensate for this problem instead of a fixed one. The complete small signal model of a PEM Fuel cell system is developed to perform a stability analysis and to present a design guideline. For a design example, a 1kW PEM fuel cell system with a DSP 56F807 (Motorola Inc) was built and tested using the proposed MEPT algorithm. This control algorithm is very effective for a soft current change load like a grid connected system or a hybrid electric vehicle system with a secondary energy source.

출력변동 저감 및 출력범위 예측 향상을 위한 풍력-연료전지 하이브리드 시스템의 운영방법 (Operation Scheme to Regulate the Active Power Output and to Improve the Forecasting of Output Range in Wind Turbine and Fuel-Cell Hybrid System)

  • 김윤성;문대성;원동준
    • 전기학회논문지
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    • v.58 no.3
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    • pp.531-538
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    • 2009
  • The paper deals with an operation scheme to improve the forecasting of output range and to regulate the active power output of the hybrid system consisting of a doubly fed induction generator (DFIG) and a fuel-cell. The power output of the wind turbine fluctuates as the wind speed varies and the slip power between the rotor circuit and power converter varies as the rotor speed change. The power fluctuation of a DFIG makes its operation difficult when a DFIG is connected to grid. A fuel cell system can be individually operated and adjusted output power, hence the wind turbine and fuel cell hybrid system can overcome power fluctuation by using a fuel-cell power control. In this paper, a fuel-cell is performed to regulate the active power output in comparison with the regulated active power output of a DFIG. And it also improves the forecasting of output range. Based on PSCAD/EMTDC tools, a DFIG and a proton exchange membrane fuel cell(PEMFC) is simulated and the dynamics of the output power in hybrid system are investigated.

Implementation of a Fuel Cell Dynamic Simulator

  • Lim, Jeong-Gyu;Chung, Se-Kyo
    • Journal of Power Electronics
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    • v.7 no.4
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    • pp.336-342
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    • 2007
  • This paper presents the development of a fuel cell dynamic simulator using a programmable DC power supply and LabVIEW graphical user interface. The developed simulator closely describes the static and dynamic characteristics of an actual proton exchange membrance fuel cell (PEMFC). The experimental results are provided to verify the operation of the simulator. The developed simulator can be used as a convenient and economic alternative to an actual fuel cell for developing and testing a fuel cell power conditioning system.

그린홈 보급확대를 위한 건물용 연료전지 보조기기의 성능 향상 (Performance improvement of BOP Components for 1kW Stationary Fuel Cell Systems to Promote Green-Home Dissemination Project)

  • 이선호;김동하;김민석;전희권
    • 한국신재생에너지학회:학술대회논문집
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    • pp.89.1-89.1
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    • 2011
  • According to green growth's policy, green-home dissemination's projects are promoting. Among them, stationary fuel cell systems are receiving attention due to high efficiency and clear energy. But it need absolutely to develop cost down technologies and improve system durability for commercialization of the fuel cell system. To achieve this objectives, in 2009, the Korean Government and "Korea Institute of Energy Technology Evaluation and Planning(KETEP)" launched into the strategic development project of BOP technology for practical applications and commercializations of stationary fuel cell systems, named "Technology Development on Cost Reduction of BOP Components for 1kW Stationary Fuel Cell Systems to Promote Green-Home Dissemination Project". This paper introduces a summary of improved BOP performances that has been achieved through the 2nd year development precesses(2010.06~2011.05) base on 1st year development precesses(2009.06~2010.05). The major elements for fuel cell systems are cathode air blowers, burner air blowers, preferential oxidation air blowers, fuel blowers, cooling water pumps, reformer water pumps, heat recovery pumps, mass flow meters, electrical valves, safety valves and a low-voltage inverter. Key targets of those elements are the reduction of cost, power consumption and noise. Invert's key targets are development the low -voltage technologies in order to reduce the number of unit cell in fuel cell system's stack.

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PEM 연료전지 시스템 모델링-자동차용 연료전지 시스템의 주요 작동 변수 변경에 따른 시스템 효율 민감도 분석 (Modeling of PEM Fuel Cell System-Sensitivity Analysis of System Efficiency with Different Main Operating Parameters of Automotive Fuel Cell System)

  • 김한상;강병길;원권상
    • 한국수소및신에너지학회논문집
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    • v.30 no.5
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    • pp.401-410
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    • 2019
  • The operating conditions greatly impact the efficiency and performance of polymer electrolyte membrane (PEM) fuel cell systems and must be properly managed to ensure better performance and efficiency. In particular, small variations in operating conditions interact with each other and affect the performance and efficiency of PEM fuel cell systems. Thus, a systematic study is needed to understand how small changes in operating conditions affect the system performance and efficiency. In this paper, an automotive fuel cell system (including cell stack and balance of plant [BOP]) with a turbo-blower was modeled using MATLAB/Simulink platform and the sensitivity analyses of main operating parameters were performed using the developed system model. Effects of small variations in four main parameters (stack temperature, cathode air stoichiometry, cathode pressure, and cathode relative humidity) on the system efficiency were investigated. The results show that cathode pressure has the greatest potential impact on the sensitivity of fuel cell system efficiency. It is expected that this study can be used as a basic guidance to understand the importance of achieving accurate control of the fuel cell operating conditions for the robust operation of automotive PEM fuel cell systems.

선박 보조전원을 위한 저가형 하이브리드 연료전지 시스템 적용 타당성 연구 (A Feasibility Study of Low-Cost Hybrid Fuel-Cell System for Ship Auxiliary Power)

  • 양근령;안상용;추진훈
    • 신재생에너지
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    • v.9 no.4
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    • pp.3-12
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    • 2013
  • This paper proposes the hybrid fuel cell system that can solve disadvantages of existing fuel cell system and ensure high reliability and high stability. The system consists of PEM fuel cell, Ni-MH battery and power management system. In this system, when the power provided from the fuel cell is higher than the load power, the extra energy may be used to charge the Ni-MH battery. When the fuel cell can not provide enough energy to the load, the shortage of energy will be supplied by the Ni-MH battery. Experimental results show that the output voltage is regulated well during load variations. Also, high system efficiency is achieved.

정출력 조정을 위한 풍력-연료전지 하이브리드 시스템의 운영 기법 (Operation Scheme to Regulate Constant Active Power Output of Wind Turbine and Fuel-Cell Hybrid System)

  • 김윤성;문대성;원동준
    • 대한전기학회:학술대회논문집
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    • pp.1174-1175
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    • 2008
  • A operation scheme to regulate the active power output of the hybrid system consisted of a doubly fed induction generator(DFIG) and a fuel-cell are presented. The power output of the wind turbine fluctuates as the wind speed varies and the slip power between the rotor circuit and power converter varies as the rotor speed change. A fuel cell system can be individually operated and adjusted output power. In this paper, a fuel-cell is performed to regulate the active output power in comparison with the active power output of a DFIG. Based on PSCAD/EMTDC power system tools, we simulated a DFIG and a fuel cell and investigated about dynamics of the output power in hybrid system.

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Effects of Key Operating Parameters on the Efficiency of Two Types of PEM Fuel Cell Systems (High-Pressure and Low-Pressure Operating) for Automotive Applications

  • Kim Han-Sang;Lee Dong-Hun;Min Kyoungdoug;Kim Minsoo
    • Journal of Mechanical Science and Technology
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    • v.19 no.4
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    • pp.1018-1026
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    • 2005
  • The proton exchange membrane (PEM) fuel cell system consisting of stack and balance of plant (BOP) was modeled in a MATLAB/Simulink environment. High-pressure operating (compressor type) and low-pressure operating (air blower type) fuel cell systems were con­sidered. The effects of two main operating parameters (humidity and the pressure of the supplied gas) on the power distribution characteristics of BOP and the net system efficiency of the two systems mentioned above were compared and discussed. The simulation determines an optimum condition regarding parameters such as the cathode air pressure and the relative humidity for maximum net system efficiency for the operating fuel cell systems. This study contributes to get a basic insight into the fuel cell stack and BOP component sizing. Further research using muli­object variable optimization packages and the approach developed by this study can effectively contribute to an operating strategy for the practical use of fuel cell systems for vehicles.

연료전지항공기 기술 동향 (Technical Trends for Fuel Cell Aircraft)

  • 김근배
    • 항공우주산업기술동향
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    • v.7 no.2
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    • pp.95-105
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    • 2009
  • 연료전지는 소음이 낮고$CO_2$ 배출이 없는 친환경적 특성을 기반으로 항공기 추진시스템에 적용되고 있으며, 현재 연료전지를 탑재한 여러 종류의 무인항공기와 소형 유인항공기 개발이 진행되고 있다. 항공기용 연료전지는 대표적으로 PEMFC(Proton Exchange Membrane Fuel Cell)방식과 SOFC(Solid Oxide Fuel Cell) 방식으로 분류되며, 항공기의 임무 및 운용조건에 적합한 연료전지 시스템이 개발되고 있다. 무인항공기의 경우 대부분 PEM 연료전지 기술을 기반으로 군용 또는 상용으로 활용할 수 있는 다양한 형태와 크기의 항공기가 개발되고 있으며, 시스템의 안정성과 운용시간이 더욱 향상될 것이다. 소형 유인항공기에서는 추진시스템을 연료전지로 대체하기 위한 많은 연구가 수행되고 있으며, 또한 대형 상용 항공기의 보조동력장치(APU)에 연료전지를 적용하여 성능을 높이기 위한 개발이 진행되고 있다. 향후, 연료전지항공기는 연료전지의 전력밀도 증가와 더불어 신뢰성과 효율을 더욱 향상시킬 것으로 기대된다.

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