• Title, Summary, Keyword: Fuel Cell System

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Fuel Cell Powered UAV with NaBH4 as a Hydrogen Source

  • Kim, Tae-Gyu;Shim, Hyun-Chul;Kwon, Se-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.579-582
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    • 2008
  • PEM Fuel cell system was designed and constructed to use as a power source of unmanned aerial vehicles(UAV) in the present study. Sodium borohydride was selected as a hydrogen source and was decomposed by catalytic hydrolysis reaction. Fuel cell system consists of a fuel cell stack, a hydrogen generation system(HGS), and power management system(PMS). HGS was composed of a catalytic reactor, micropump, fuel cartridge, and separator. Hybrid power system between lithium-polymer battery and fuel cell was developed. The fuel cell system was integrated and packaged into a blended wing-body UAV. Energy density of the total system was 1,000 $W{\cdot}hr/kg$ and high endurance more than 5 hours was accomplished in the ground tests.

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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 of Modeling PEM Fuel Cell System Using Multi-Variable Optimization Technique for Automotive Applications (다변수 최적화 기법을 이용한 자동차용 고분자전해질형 연료전지 시스템 모델링에 관한 연구)

  • Kim, Han-Sang;Min, Kyoung-Doug;Jeon, Soon-Il;Kim, Soo-Whan;Lim, Tae-Won;Park, Jin-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • pp.541-544
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    • 2005
  • This study presents the integrated modeling approach to simulate the proton exchange membrane (PEM) fuel cell system for vehicle application. The fuel cell system consisting of stack and balance of plant (BOP) was simulated with MATLAB/Simulink environment to estimate the maximum system power and investigate the effect of BOP component sizing on system performance and efficiency. The PEM fuel cell stack model was established by using a semi-empirical modeling. To maximize the net efficiency of fuel cel1 system, multi-variable optimization code was adopted. Using this method the optimized operating values were obtained according to various system net power levels. The fuel cell model established was co-linked to AVL CRUISE, a vehicle simulation package. Through the vehicle simulation software, the fuel economy of fuel cell powered electric vehicle for two types of driving cycles was presented and compared. It is expected that this study tan be effectively employed in the basic BOP component sizing and in establishing system operation map with respect to net power level of fuel cell system.

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Fuel Cell Inverter Operation for Distributed Generation of simulation (연료전지의 인버터 운전 시뮬레이션)

  • Jeong, Dong-Hyo
    • Proceedings of the KIEE Conference
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    • pp.170-174
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    • 2007
  • 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.

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Development of a 25kW-Class PEM Fuel Cell System for the Propulsion of a Leisure Boat (선박 추진용 25kW급 고분자전해질 연료전지 시스템 개발)

  • Han, In-Su;Jeong, Jeehoon;Kho, Back-Kyun;Choi, Choeng Hoon;Yu, Sungju;Shin, Hyun Khil
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.3
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    • pp.271-279
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    • 2014
  • A 25kW-class polymer electrolyte membrane (PEM) fuel cell system has been developed for the propulsion of a leisure boat. The fuel cell system was designed to satisfy various performance requirements, such as resistance to shock, stability under rolling and pitching oscillations, and durability under salinity condition, for its marine applications. Then, the major components including a 30kW-class PEM fuel cell stack, a DC-DC converter, a seawater cooling system, secondary battery packs, and balance of plants were developed for the fuel cell system. The PEM fuel cell stack employs a unique design structure called an anodic cascade-type stack design in which the anodic cells are divided into several blocks to maximize the fuel utilization without hydrogen recirculation devices. The performance evaluation results showed that the stack generated a maximum power of 31.0kW while maintaining a higher fuel utilization of 99.5% and an electrical efficiency of 56.1%. Combining the 30-kW stack with other components, the 25kW-class fuel cell system boat was fabricated for a leisure. As a result of testing, the fuel cell system reached an electrical efficiency of 48.0% at the maximum power of 25.6kW with stable operability. In the near future, two PEM fuel cell systems will be installed in a 20-m long leisure boat to supply electrical power up to 50kW for propelling the boat and for powering the auxiliary equipments.

A Feasibility Study for a Stratospheric Long-endurance Hybrid Unmanned Aerial Vehicle using a Regenerative Fuel Cell System

  • Cho, Seong-Hyun;Cha, Moon-Yong;Kim, Minjin;Sohn, Young-Jun;Yang, Tae-Hyun;Lee, Won-Yong
    • Journal of Electrochemical Science and Technology
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    • v.7 no.1
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    • pp.41-51
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    • 2016
  • In the stratosphere, the air is stable and a photovoltaic (PV) system can produce more solar energy compared to in the atmosphere. If unmanned aerial vehicles (UAVs) fly in the stratosphere, the flight stability and efficiency of the mission are improved. On the other hand, the weakened lift force of the UAV due to the rarefied atmosphere can require more power for lift according to the weight and/or wing area of the UAV. To solve this problem, it is necessary to minimize the weight of the aircraft and improve the performance of the power system. A regenerative fuel cell (RFC) consisting of a fuel cell (FC) and water electrolysis (WE) combined PV power system has been investigated as a good alterative because of its higher specific energy. The WE system produces hydrogen and oxygen, providing extra energy beyond the energy generated by the PV system in the daytime, and then saves the gases in tanks. The FC system supplies the required power to the UAV at night, so the additional fuel supply to the UAV is not needed anymore. The specific energy of RFC systems is higher than that of Li-ion battery systems, so they have less weight than batteries that supply the same energy to the UAV. In this paper, for a stratospheric long-endurance hybrid UAV based on an RFC system, three major design factors (UAV weight, wing area and performance of WE) affecting the ability of long-term flight were determined and a simulation-based feasibility study was performed. The effects of the three design factors were analyzed as the flight time increased, and acceptable values of the factors for long endurance were found. As a result, the long-endurance of the target UAV was possible when the values were under 350 kg, above 150 m2 and under 80 kWh/kg H2.

An Assessment on Voltage and Power Quality in Load Facility during the Islanding of Residential Fuel Cell System (가정용 연료전지 시스템의 단독운전 시 부하설비의 전압 및 전력품질 평가)

  • Park, Chan-Eom;Jung, Jin-Soo;Han, Woon-Ki;Lim, Hyun-Sung;Song, Young-Sang;Kim, Choon-Sam;Lim, Duk-Gyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1792-1797
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    • 2013
  • Recently, due to the excessive use of fossil fuels, many studies about the fossil fuels such as solar and fuel cell energy source are progressing. Fuel cell system has high energy conversion efficiency. Also, fuel cell system is environmentally friendly system because the carbon emission is almost not occur. Therefore, the fuel cell system is considered as the core technology of in the fields of the future energy and environmental. Fuel cell system has an effect on distribution power system because another power source of other than large power plants. So, fuel cell system can be reason of power quality in the power system. In this paper, we constructed the system for an assessment on Islanding. The system is composed with power source, Impedance coordination load and linear load, fuel cell system. we are performed assessment on voltage and power quality in customer and the distributed power system during the Islanding of residential fuel cell system. In addition, no change in the impedance of power system, we made a islanding condition only using the actual load, As a variation of generation and load current under islanding, an analysis results based on assessment system showed that the power qualities of distribution system became more aggravation as effect of voltage sag and voltage swell phenomena.

A Study on PWM Converter/Inverter Drive System by a Fuel Cell Simulator (연료전지 Simulator에 의한 PWM 컨버터/인버터 구동시스템에 관한 연구)

  • 이태원;장수진;김진태;구자성;원충연;김창현
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.3
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    • pp.222-230
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    • 2004
  • In this paper, a 3㎾ fuel cell generation system with an active fuel cell simulator has been proposed. The developed fuel cell simulator generates the actual voltage and current output characteristics of the Polymer Electrolyte Membrane Fuel Cell (PEMFC), so that the overall performance and the dynamics of the proposed system could be effectively examined and tested. In This paper, at first, the system configuration and operational principle of the developed fuel cell simulator has been investigated and the design process of the fuel cell generation system is explained in detail. In addition, the validity of the proposed system has been verified lly the informative simulation and experimental result

The characteristic analysis for polymer of household macromolecule fuel cell (가정용 고분자 연료전지의 중합체에 대한 특성해석)

  • Cho, Y.R.;Kim, N.H.;Han, K.H.;Yun, S.Y.;Baek, S.H.;Kim, I.N.
    • Proceedings of the KIEE Conference
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    • pp.1722-1724
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    • 2005
  • The focus of this paper is to develop a mathematical model for investigating the dynamic performance of a polymer electrolyte membrane fuel cell. The model in this work is based on physical laws having clear significance in replicating the fuel cell system and can easily be used to set up different operational strategies. Simulation results display the transient behavior of the voltage within each single cell, and also within a number of such single cells combined into a fuel cell stack system. A linear as well as a nonlinear analysis of the polymer electrolyte membrane fuel cell system(PEMFC) has been discussed in order to present a complete and comprehensive view of this kind of modeling. Also, a comparison of the two kinds of analysis has been performed. Finally, the various characteristics of the fuel cell system are plotted in order to help us understand its dynamic behavior. Results indicate that there is a considerable amount of error in the modeling process if we use a linear model of the fuel cell. Thus, the nonlinearities present in the fuel cell system should be taken into account in order to obtain a better understanding of the dynamic behavior of the fuel cell system.

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The development of High efficiency fuel processor for technical independence 5kW class fuel cell system (기술자립형 5kW 연료전지 시스템 구축을 위한 고효율 연료변환기 개발)

  • Lee, Soojae;Choi, Daehyun;Jun, Heekwon
    • 한국신재생에너지학회:학술대회논문집
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    • pp.123.2-123.2
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    • 2010
  • Fuel Cell cogeneration system is a promising technology for generating electricity and heat with high efficiency of low pollutant emission. We have been developed 5kW class fuel cell cogeneration system for commercial and residential application. The fuel processor is a crucial part of producing hydrogen from the fossil fuels such as LNG and LPG. The 5kW class high efficiency fuel processor consists of steam reformer, CO shift converter, CO preferential oxidation(PrOx) reactor, burner and heat exchanger. The one-stage CO shift converter process using a metal oxide catalyst was adopted. The efficiency of 5 kW class fuel processor shows 75% based on LHV. In addition, for the purpose of continuous operation with load fluctuations in the commercial system for residential use, load change of fuel processor was tested. Efficiency of 30%, 50%, 70% and 100% load shows 75%, 75%, 73% and 72%(LHV), respectively. Also, during the load change conditions, the product gas composition was stable and the outlet CO concentration was below 5 ppm. The Fuel processor operation was carried out in residential fuel cell cogeneration system with fuel cell stack under dynamic conditions. The 5kW class fuel processor have been evaluated for long-term durability and reliability test including with improvement in optimal operation logic.

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