• 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

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.701-706
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• 2003

Fuel cell is remarkable for one of the clean energy recently. But in the fuel cell case, it has characteristics with low voltage and high current. Therefore, for using domestic power, it should be changed to the power source with commercial voltage and frequency. In this paper fuel cell simulator having electrical characteristics is designed and constructed instead of fuel cell stack. Voltage generated from fuel cell is from 39V to 72V dc and should be boosted to 400v do for home appliances. A stand alone system including the inverter and DC/DC converter for the fuel cell is then proposed. Experimental result is used to support the analysis.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.730-735
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• 1998

Power conditioning system, especially for power converter, is considered for the fuel cell power plants. Various characteristics of the fuel cell are analyzed and various choices of power converters are considered. One of the main converters, the boost type is selected and analyzed as an example.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.12 no.3
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• pp.83-88
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• 1998

This paper presents an overview of environmental evaluation for a photovoltaic-fuel cell hybrid power plant through the Ideal Point approach, which is one of multiobjective decision support systems. Its evaluation is carried out in terms of such tow criteria as land requirement for plant construction and lifetime CO2 emissions, and ten compared with conventional fossil fuel power plants. Fuel cell power system has been proven a viable technology to back up severe PV power fluctuations under inclement weather conditions. Fuel cell power generation, containing small land use, is able to alleviate the heavy burden of large surface requirement of PV power plants. In addition, the PV-fuel cell hybrid power system shows a very little potential for lifetime CO2 emissions.

• Transactions of the Korean hydrogen and new energy society
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• v.19 no.5
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• pp.417-422
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• 2008

In this paper, a novel DC/DC low-voltage high-current converter circuit is proposed to improve the efficiency of power converter used in the grid-connected fuel-cell generator system. We proposed a novel high efficiency grid-connected power conditioning system for RPG fuel cell. On the result of that, the loss of system was decreased rapidly by driving stack within the condition of maximum efficiency. The peak currents of the current-type inductor and the transformer's coil are reduced by synchronizing switching frequency of Buck-type converter is increased twice as the Push-Pull converter's switching frequency. The novel structure of DC/DC converter is able to realize ZVS-ZCS in fuel-cell system is proposed. The proposed switching component of Push-Pull converter has the ZVS and ZCS function by using the circuit of new passive clamp.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.9
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• pp.62-70
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• 2010

Fuel cell system which can solve the environmental problem is receiving attention. To use utility power necessary power conversion system from low voltage that is generated by fuel cell system. because fuel cell has special characteristic of low voltage high current. To improve PCS's efficiency the paralleling method is used. Available the method could reduce the switching loss. But the existing research could not be found optimal result and accompanying several effects. In this study analysis several effects causing the parallel method. The effects have been demonstrated through simulations and experiments.

• New & Renewable Energy
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• v.1 no.4 s.4
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• pp.49-54
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• 2005

There is close relation between the heat generation in the fuel cell stack and the fuel performance. In PEM fuel cell vehicles, the stack coolant temperature is about $65^{\circ}C$, which is far lower than that for general automobile engine. Therefore, it is hard to release heat generated in the stack by using a radiator of limited size because of the reduced temperature difference between the coolant and the ambient air. In this study, indirect stack cooling system using $CO_2$ heat pump was designed and its stack cooling performance in releasing heat to the ambient was investigated. This work focuses on a series of processes that grasp the relation among the fuel cell power, the radiator capacity and the stack temperature. The purpose of this work is to find out a way to properly release sufficient amount of heat through the finite sized radiator, so that the slack power generation can not be deteriorated due to the stack temperature increase. The optimization between the compressor power consumption and the fuel cell output power can be carried out to maximize the performance of fuel cell system.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.855-861
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• 2008

The development of fuel cell hybrid power system, as a next generation power system for solving the global warming, has been being made actively progress around passenger vehicles. Also, in case of railway vehicles in unelectrified railway line, the adoption of fuel cell hybrid power system is being studied around well-known manufacturers. This paper introduces both the configuration and the control strategy of fuel cell hybrid power system in order to apply to a light electronic railway vehicle having a repeated driving pattern of acceleration, coasting and deceleration and provides simulation results to evaluate their validity.

• Journal of Electrical Engineering and Technology
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• v.13 no.6
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• pp.2553-2560
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• 2018

In Korea, there are no instances where a hydrogen fuel cell power generation system has been used in a railway vehicle. Only the basic topology has been studied. In the previous study, conventional converters using a single switch were applied to the fuel cell power generation system. Therefore, current stress on the switch at converter on-off transitions would be large when controlling a large-capacity railway vehicle. In addition, since the input side ripple is also large, there is a problem with a shortening of the lifetime of both the fuel cell power generation system and the inductor. In this paper, a soft-switching transformer inductor boost converter for fuel cell powered railway vehicles was proposed. A technique to reduce both the switching current stress generated during on-off transitions, and the input ripple current flowing in the inductor were studied. The soft-switching TIB converter uses a transformer-type inductor to configure the entire circuit in an interleaved method, and reduces both input current ripple and the current ripple of the inductor and switch.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.109.1-109.1
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• 2011

KEPCO was operating power plants with diesel generators in 49 islands including Baekryeong-Do, and the generation capacity was about 66 MW in 2008. The cost of fuel is increasing by the international oil price inflation and continuous rise of oil price is predicted. For the stabilizing of electric power supply to the separate islands, renewable energy and fuel cell systems were considered. Hydrogen is made using renewable energy such as wind power and solar energy, and then a fuel cell system generates electricity with the stored hydrogen. Though the system efficiency is low, it is treated as the only way to secure the stable electric supply using renewable energy at this present. The analytic hierarchy process was used to select suitable candidate island for the system installation and 5 islands including Ulleung-Do were selected. Economic evaluation for the system composed of a kerosene generator, a wind power, an electrolysis, and a fuel cell system was conducted with levelized generation cost based on present value methode. As the result, the necessity of renewable energy combined generation system and micro grid composition in the candidated islands was confirmed. Henceforth, the development of an integration technology which connects micro grid to the total power grid will be needed.