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RISS 인기검색어
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- 저자 : 한운기(Woonki Han) (검색결과 6 건)
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Development of Electrical Safety Evaluation Method about PEMFC 1kW
한운기(Han, Woonki),박찬엄(Park, Chaneum),정진수(Jung, Jinsu),고원식(Ko, Woonsik) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Fuel cell systems are a completely different form of electricity source that has been used so far and is an aggregation of multiple technologies with multidisciplinary features that can be operated safely only when gas and electrical safety are being considered. Since fuel cells generate through electrochemical reactions there are difficulties in ensuring electricity safety, power quality assessment, effective control and reliability standards for system faults using conventional inspection techniques and even though they are necessary as a primary means for reduction of co₂ owing to the Climate Convention, electrical safety assessment and measures are required for the prevention of faults in residential facilities. Although small-scaled distributed power supplies can be utilized as important means of peak control and energy management measures, research is required for observing the effects on the system and the development of inspection technology to ensure stable operation, and the electrical safety of residential fuel cell systems need to be assessed and the problems derived for establishing electrical safety standards. From the year 2002, Japan has established laws on technical safety standards and development and rules on the product specifications and standards for the industrialization of hydrogen fuel cells. Also, a lot of effort have been made for the commercialization of fuel cells by building one-stop certification services. Internationally, the IEC TC 105 has established international standards based on fuel cells. In order to protect the national interest, the country should be able to respond accordingly meet global standards. In fact, in Korea, to comply with the international trend, Korea Energy Management Corporation is establishing a certified agenda for fuel cells and Korean Agency for Technology and Standards is enacting technical standards for fuel cells. The current terms of fuel cells are that research has been focused more on the quality and performance of manufactured products rather than stable power operation and maintenance over time. In this paper, by considering the household fuel cell as a power device, the safety standards of the fuel cell system for a reliable operation with the existing power system is being proposed.
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Development of EIS Evaluation Method about PEMFC 1kW STACK
박찬엄(Park, Chaneom),한운기(Han, Woonki),정진수(Jung, Jinsu),고원식(Ko, Wonsik) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Electrochemical impedance spectroscopy(EIS) are using widely as a useful technique mainly in the field of electrochemical for the analysis of electrode reactions or characteristics of the composites. The response analysis of the systems technique provides comprehensive informations about the characteristic and structure of complex and internal reaction. The EIS is the method to measure impedance of the measurement target classified by the frequency, it select the equivalent impedance model to give same response from the result and it calculate the parameter. Therefore, the chemical reaction inside the fuel cell is to modeling to electrical impedance. And as repeating the same experiment in each of the operating point, we can get each different parameter. As a result, we can establish the equivalent impedance model in each operating point. Therefore, if we use these models, we can evaluate the fuel cell without the internal design parameter of the fuel cell as required in existing modeling. The EIS is used typically technique for distinguish status of fuel cell called SOH(State Of Health). When the fuel cell is degradation, Efficiency and health of the fuel cell is reduced because internal impedance is increase. As usage of these principles, we can evaluate state of fuel cell through the impedance analysis of fuel cells. In this study, we are presents EIS distinction system and algorithm for residential fuel cell systems. At the time of the fuel cell installation in the fields, the EIS system and proposed algorithm will be able to apply as technique for efficiency and performance evaluation about fuel cell system.
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PSCAD/EMTDC를 이용한 실제 풍력발전 고조파 데이터 분석 모듈 개발
김미현(Mihyun Kim),변길성(Gilsung Byeon),장길수(Gilsoo Jang),한운기(Woonki Han) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
The development and installation of high-capacity wind generation system to supply a large amount of required electricity to the connected power system have become a new trend in recent years. Accordingly, the increase in the utilization of wind power generation system has had an important influence on power quality. Therefore, wind power generation system must maintain the power quality similar to that of the conventional power plants, to ensure the stability and reliability of the power system it is connected to. Also, it is very important to understand the sources of disturbances that affect the power quality. In this paper, in order to observe the effect of harmonics depending on the proportion of wind power supply against the power supply from KEPCO, simulations were executed in PSCAD/EMTDC. one of the power system analysis programs.
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20㎿의 풍력발전단지의 실측 데이터 기반한 전력품질 분석 평가
김미현(Mihyun Kim),변길성(Gilsung Byeon),이한상(Hansang Lee),장길수(Gilsoo Jang),한운기(Woonki Han) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
Wind power plants must provide the power quality required, similar to that provided by the conventional power plants, to ensure the stability and reliability of the power system it is connected to. Although many operational aspects affect wind power plant operation, this paper, we focus on power quality. Since a wind power plant is connected to the grid, it is very important to understand the sources of disturbances that affect the power quality. This paper performs power quality analysis based on actual data of wind power plants. Especially, it has analysed voltage variation, power factor, harmonics in comparison with distributed generation network interconnection technology standards. In this paper, when the power amount was below 2㎿, there was a deterioration in power quality for power factor, voltage variation and harmonics.
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김미현(Mihyun Kim),변길성(Gilsung Byeon),장길수(Gilsoo Jang),한운기(Woonki Han),안재민(Jaemin Ahn) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The development and installation of high-capacity wind generation system to supply a large amount of required electricity to the connected power system have become a new trend in recent years. In this respect, the increasing use of wind power generation system has had an important influence on power quality. Therefore, wind power generation system must maintain the power quality similar to that of the conventional power plants, to ensure the stability and reliability of the power system it is connected to. Also it is very important to understand the sources of disturbances that affect the power quality. In this paper, flicker analysis based on actual wind turbine measurement data is performed especially. To ensure its validation, real-time measurement data is utilized. And power quality measurement and assessment require that wind turbines connected to the power distribution grid are compatible with the interconnection standard for distributed generation presented by Korea Electrical Power Corporation (KEPCO).
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