• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.274-277
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• 2009

본 논문에서는 소형 PEM(Proton Exchange Membrane) 연료전지 스택의 BOS(Balance of Stack) 제어에 관하여 논의한다. 별도의 가습 장치가 필요치 않고 BOS의 구성이 비교적 간단한 소형 PEM 연료전지 시스템에서는 팬과 퍼지밸브만의 제어를 통해 스택 내부 수분의 조절과 열 관리가 수행된다. 따라서 본 논문에서는 부하에 따른 최적의 공기유량을 계산하고 요구되는 유량의 공급을 위해 팬을 제어하는 알고리즘을 통해 소형 연료전지 시스템의 과도응답 특성과 안정성을 향상시키는 방법에 관하여 제안한다. 150W급 소형 연료전지 시스템을 꾸미고, 마이크로컨트롤러를 이용한 제어회로를 구현하여 실험함으로써 제안된 알고리즘의 유용함을 검증하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.6
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• pp.469-475
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• 2008

In this paper, control of small PEM(Proton Exchange Membrane) fuel cell stack by a microprocessor is introduced. The water management of fuel cell stack inside, a key technique in fuel cell control, can be achieved by adjusting the required air flow for fuel and cooling, and by purging the excessive water from the stack. It is very important to precisely control the BOS(Balance of Stack) since the stable operation of the fuel cell system mainly depends on it. In this study the fuel efficiency of the system is improved by the control of the system based on the measured air flow and purge cycle during the optimal operation and its effectiveness is proved by the experiments. The operating stability of the system is improved by the developed controller using a microprocessor and it is expected to be widely used for the control of small PEM fuel cell stack.

• Journal of Institute of Control, Robotics and Systems
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• v.16 no.9
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• pp.823-826
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• 2010

In this study, the control method of assistive robot was developed for the elderly. The control method of gait-assistant-robot was proposed considering the change of COP (Center of Pelves), BOS (Base of Support) and comparative analysis of the moving velocity for the elderly. We analyzed the movement of COP of the body and its velocity of the elderly equipped with manual walker and gait-assistant-robot. As a result, change in COP was greater from left to right than from anterior to posterior; also, the average velocity of the movement of COP and manual walker for manual walker gait was 0.7(m/s). Therefore, it is necessary to concern more on the left-right balance and synchronization of the velocity of COP.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.1423-1424
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• 2010

• Transactions of the Korean hydrogen and new energy society
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• v.17 no.3
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• pp.338-346
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• 2006

In this paper, the test results of medium-size(120 kW class) PV system which was installed in the Taeahn thermal power station of Korea Western Power Co., Ltd., were summarized for developing the practical technology to applicate high voltage grid connection PV system. The 120 kW photovoltaic system which was consisted of 1,300 modules, PCS, and 150 kVA transformer station has been operated since Aug. 05, 2005. For verifying the modeling results of PV system, the operation data was compared with modeling results which was executed commercial PSCAD/EMTD and Psim tools. An equivalent circuit model of a solar cell has been also used for solar array modeling. A series of parameters required for array modeling have been estimated from general specification data of a solar module. A PWM voltage source inverter(VIS) and its current control scheme have been analyzed by using P&O (perturbation and Observation) MPPT algorithms technique.