• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.55-57
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• 1998

Molten carbonate fuel cell (MCFC) power plant is expected to be one of the most promising future power generation system for the electric utilities because of its high efficiency, environmental suitability and capability of using coal as fuel. To get such attractive performance, it is necessary to consider optimizing operation and gas recycling system. This paper describes the simulation results of 7 kW MCFC stack in KEPRI and the effects of the three possible gas recycling operations, i.e. cathode gas recycling, anode gas recycling, anode gas recycling with catalytic burner.

• Journal of Electrical Engineering and Technology
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• 제2권2호
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• pp.231-240
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• 2007

This paper presents an advanced modeling and simulation technique applied to DC/DC power electronic converters fed through renewable energy power sources. The distributed generation (DG) system at the Illinois Institute of Technology, which employs a phase-l system consisting of a photovoltaic-based power system and a phase-2 system consisting of a fuel cell based primary power source, is studied. The modeling and simulation of the DG system is done using the generalized state space averaging (GSSA) method. Furthermore, the paper compares the results achieved upon simulation of the specific GSSA models with those of popular computer aided design software simulations performed on the same system. Finally, the GSSA and CAD software simulation results are accompanied with test results achieved via experimentation on both, the PV-based phase-l system and the fuel cell based phase-2 power system.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.17-20
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• 2008

HYOSUNG manufactured and tested 1kW class PEFC systems to generate electrical and thermal energy for each residential usage. In particular, HYOSUNG developed power conditioning system that performs over 91% electrical conversion ratio specified in 1kW class PEFC systems. Prior to system integration, we tested each performances of components to derive control issues from it. In addition, we have been developing the adequate simulator to describe and predict system performance. In this paper, we verified HYOSUNG's 1kW class PEFC systems are valid for residential energy sources by testing the characteristics of systems and performances of main components.

• 조명전기설비학회논문지
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• 제23권12호
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• pp.169-175
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• 2009

미생물 연료전지(MFC: Microbial Fuel Cell)는 미생물을 사용하여 유기물의 산화에서 전기를 일으키는 장치이다. 현재 MFC는 많은 곳에서 연구되고 있으며 신재생 에너지로도 많은 관심을 받고 있다. 기존의 연구에서는 전력생산에 영향을 미치는 각각의 요인에 관련된 연구가 많이 진행되었으나, 요인들의 상호관계에 관한 연구는 많지 않았다. 본 논문에서는 기존의 MFC를 개선하기 위해 전력의 생산을 좌우하는 요인을 조사하였으며, 요인들의 상호관계를 효율적으로 증명하기 위해 새로운 반응조를 제작하였다. 실험을 통해 얻어진 데이터를 기초로 MFC에서 전력생산에 영향을 미치는 요인들을 분석하였으며 이를 바탕으로 하폐수처리 시스템에 MFC를 적용하여 하폐수처리 및 전력을 생산한다는 새로운 개념의 에너지생산 하폐수처리 시스템을 제안하였다.

• 한국수소및신에너지학회논문집
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• 제23권5호
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• pp.503-512
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• 2012

There is a new power generation system such as direct coal fuel cell (DCFC) with a solid oxide electrolyte operated at relatively high temperature. In the system, it is of great importance to feed coal continuously into anodic electrode surface for its better contact, otherwise it would reduce electrochemical conversion of coal. For that purpose, it is required to improve the electrochemical conversion efficiency by using either rigorous mixing condition such as fluidized bed condition or just by recirculating coal particle itself successively into the reaction zone of the system. In this preliminary study, we followed the second approach to investigate how significantly particle recycle would affect the coal conversion efficiency. As a first phase, coal conversion was analyzed and evaluated from the thermochemical reaction of carbon with air under particle recirculating condition. The coal conversion efficiency was obtained from raw data measured by two different techniques. Effects of temperature and fuel properties on the coal conversion are specifically examined from the thermochemical reaction.

• 에너지공학
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• 제25권4호
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• pp.251-258
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• 2016

연료전지는 전기를 발전하면서 동시에 열도 생산하며, 본 고는 이 두 가지를 함께 이용하는 가정용의 마이크로 연료전지-열병합발전(${\mu}FC$-CHP) 시스템에 관한 조사보고서이다. 열병합발전 시스템을 구성하는 몇 가지 방안 중에서 연료전지는 전기와 열 효율을 합쳐 90%가 넘는 가장 높은 에너지 효율을 갖는 시스템을 구현할 수 있어 유용성이 높다. 연료전지에는 크게 다섯 가지 종류가 있으며, 이 중 가정용 ${\mu}FC$-CHP로 적합한 것은 프로톤교환 막연료전지(PEMFC)와 고체산화물연료전지(SOFC)이다. ${\mu}FC$-CHP시스템은 독립전원으로서 송배전 손실을 줄일 수 있고 전기생산단가를 낮출 수 있으며, 오염물질을 배출하지 않는 친환경 기술이란 점 등의 장점이 많다. 단점은 초기 투자비용이 높다는 점인데, 기술의 발달로 제작 단가를 줄여 이를 해결해나가고 있다. 현재는 일본이 시장을 선점하고 있으나 우리나라도 100만대 보급 계획을 가지고 있고, 정부가 반 정도의 설치보조금을 제공하여 시장을 견인하고 있다. 본 고에서는 이와 함께 연료전지와 열병합발전을 연결하는 기술적 내용 및 각국의 동향을 기술한다.

• 한국수소및신에너지학회논문집
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• 제30권1호
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• pp.21-28
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• 2019

Reversible solid oxide fuel cell (ReSOC) system was integrated with waste steam for electrical energy storage in distributed energy storage application. Waste steam was utilized as external heat in SOEC mode for higher hydrogen production efficiency. Three system configurations were analyzed to evaluate techno-economic performance. The first system is a simple configuration to minimize the cost of balance of plant. The second system is the more complicated configuration with heat recovery steam generator (HRSG). The third system is featured with HRSG and fuel recirculation by blower. Lumped models were used for system performance analyses. The ReSOC stack was characterized by applying area specific resistance value at fixed operating pressure and temperature. In economical assessment, the levelized costs of energy storage (LCOS) were calculated for three system configurations based on capital investment. The system lifetime was assumed 20 years with ReSOC stack replaced every 5 years, inflation rate of 2%, and capacity factor of 80%. The results showed that the exergy round-trip efficiency of system 1, 2, 3 were 47.9%, 48.8%, and 52.8% respectively. The high round-trip efficiency of third system compared to others is attributed to the remarkable reduction in steam requirement and hydrogen compression power owning to fuel recirculation. The result from economic calculation showed that the LCOS values of system 1, 2, 3 were 3.46 ¢/kWh, 3.43 ¢/kWh, and 3.14 ¢/kWh, respectively. Even though the systems 2 and 3 have expensive HRSG, they showed higher round-trip efficiencies and significant reduction in boiler and hydrogen compressor cost.

• 전기학회논문지P
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• 제59권1호
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• pp.100-105
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• 2010

This paper describes a capacity of distributed generation which will be interconnected at low voltage distribution systems. In order to set the capacity of distributed generation, a voltage variation of distribution system is considered. Besides, the capacity of distributed generation is classified according to a capacity of pole transformer and loads. The system constructions in this paper are analyzed by using PSCAD/EMTDC. In the immediate future, it is expected to increase the installation of New and renewable energy systems which are generally interconnected to distribution power systems in the form of distributed generations like photovoltaic system, wind power and fuel cell. So the study of this kind would be needed to limit the capacity of distributed generation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.266-267
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• 2007

본 논문에서는 실제 사무용 빌딩에서 많이 사용하는 부하를 조사하여 종류와 시간대별 부하 패턴을 전기적으로 모델링하였고, 일반 저항 부하모델과 연료전지의 입력전류 패턴을 비교 분석하여 빌딩부하 모델의 타당성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2007년도 추계학술대회 논문집
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• pp.193-195
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• 2007

These days, to change the new & renewable energy change the subject because environmental pollution and exhausted fossil power. The most notable Fuel cells by one of the new & renewable energies are one of very useful power conversion sources. Their advantages are low environmental pollution, highly efficient power generation, diversity of fuels (natural gas, LPG, methanol and naphtha), and reusability of exhaust heat, modularity, and faster installation. PEMFC by one of the Fuel Cells is the energy of new technology which is produced by the electric chemical reaction directly. The essential composition elements of PEMFC stack are membrane electrode assembly (MEA), catalyst, Bipolar Plate. Under the this study, know-how is manufacturing single cell of PEMFC and Study design of Low Voltage, Low Electric Power System by PEMFC Single Cell.