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퍼지논리를 이용한 연료전지/축전지 하이브리드 시스템의 운전제어
정귀성,이원용,김창수 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.1
Hybrid power systems with fuel cells and batteries have the potential to improve the operation efficiency and dynamic response. A proper load management strategy is important to better system efficiency and endurance in hybrid systems. In this paper, a fuzzy logic algorithm has been used to determine the fuel cell output power depending on the external required power and the battery state of charge(SoC). If the required power of the hybrid system is small and the SoC is small, then the greater part of the fuel cell power is used to charge the battery pack. If the required power is relatively big and the SoC is big, then fuel cell and battery are concurrently used to supply the required power. These IF-THEN operation rules are implemented by fuzzy logic for the energy management system of hybrid system. The strategy is evaluated by simulation. The results show that fuzzy logic can be effectively used to optimize the operational efficiency of hybrid system and to maintain the battery SoC properly.
정귀성(K . S . Jung),오병수(B . S . Oh) 한국수소및신에너지학회 1998 한국수소 및 신에너지학회논문집 Vol.9 No.1
Most of today`s energy supply is obtained from fossil fuels. Despite of high energy density, higher store efficiency and long mileage, fossil fuels cause environmental pollution and their reserves are limited. In this study pure hydrogen gas and oxygen gas are burned without the emission of pollution. A gas turbine is used to obtain power. Water is injected into a combustor, which prevents overheating and recovers cooling heat. Excessively supplied water is recirculated. With variation of mass flow rate and equivalence ratio, the affection of water injection rate and the temperature of injected water on efficiency and power are experimented. Injected water gets cooling heat, is expanded from liquid to vapor and raises the thermal efficiency. It is enable to determine the rate of water injection, which makes the maximum power. The increase of temperature of water injection raises the efficiency of the system.
오병수,정귀성 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The environmental problems caused by vehicles and the limitation of fossil fuels are demanding new engines with new fuel. Hydrogen fuel cell powered vehicle is considered as solution of these problems.<br/> Fuel cells are devices that change chemical energy directly into electrical energy without combustion. Using hydrogen and oxygen as reactants, they produce only water as by-product. Most of the leading automotive manufacturers have been involved in fuel cell vehicle research and development. They will try to commercialize fuel cell vehicle in four or five years.<br/> Many challenges are remained to be solved before fuel cell power system can achieve the cost reduction, performance, and reliability in order to guarantee a successful commercialization of fuel cell vehicles. Fuel cell will be improved and can be adopted widely as cleaner and more efficient automotive engine.<br/> <br/> <br/>
운전 조건에 따른 PEM 연료전지 모델링 및 성능 분석
노영우,김세훈,정귀성,손익제,한국일,안병기 한국수소및신에너지학회 2008 한국수소 및 신에너지학회논문집 Vol.19 No.3
In the present study, a mathematical model has been formulated for the performance of polymer electrolyte fuel cells. Modify the concentration polarization equation using concentration coefficient that represents the characteristics of bipolar plate reactant distribution. The model predictions have been compared with experimental results and good agreement has been demonstrated for the cell polarization curves. The effects of operating parameters on the performance of fuel cells have been studied. Increases of operation pressure reduce the effect of temperature on the performance.
풍력-태양전지에 의한 수소에너지 생산과 이용 모델 분석
이기문,박창권,정귀성,오병수,Lee, Kee Mun,Park, Chang Kwon,Jeong, Kwi Seong,Oh, Byeong Soo 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.4
Fossil fuel such as oil and natural gas has been used and will be no longer supplied enough to demand in the beginning of thisg century. The use of the fuel makes a lot of environmental pollution to threaten human being's health especially in big cities and produces a lot of $CO_{2}$ to make green house effect of the earth. It is the time to use clean fuel such as hydrogen to prevent the expected energy crisis and the pollution. A new engine such as fuel cell can be used instead of the conventional internal combustion engine with 2 to 3 times higher efficiency of the conventional engine. The fuel cell uses hydrogen and oxygen and produces electric energy and pure water, which is a calm engine without air pollution. In big cities the city buses and the taxies powered by hydrogen fuel cells are suggested to be operated for clean environment. The energy and cost analysis performed for hydrogen and electricity production from wind power and solar cell.
가정용 고분자연료전지 시스템의 운전 방법에 따른 성능 비교
이원용,김창수,정귀성,유상필,엄석기 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.4
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.
액체수소의 Exergy 를 이용한 연료전지 시스템의 성능향상
박동필(Dong Pil Park),정귀성(Kwi Seong Jeong),오병수(Byeong Soo Oh) 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.3
From wood to coal and petroleum, mankind has used various fuel. Since using such fuel, mankind has developed power source of mechanism. We obtain numerous power from caloric force. Present energy supply is based on the fossil fuel. Fossil fuel has high energy density and is convenient for transportation and storage. Human being prepared countermeasure of energy economy, high energy efficiency and substitution energy for limits of fossil fuel. High energy efficiency among them is very important. This research will improve total output by physical exergy recovery of LH₂-fuel cell system.