• Proceedings of the SAREK Conference
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• 2008.11a
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• pp.584-589
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• 2008

It is known that slab thermal storage which uses concrete slab as thermal material is effective in the load leveling and using the nighttime electric power. The temperature distribution is not constant in plenum in thermal storage time by beams, ducts such as several factor. It is considered that this fact will effect on efficiency of thermal storage and indoor thermal environment. The purpose of this paper is to examine the thermal environment inside plenum. A macro model was made for the analysis of indoor thermal environment as the first step. The flow rate distribution and temperature distribution of object room model was examined by use of basic equations such as airflow by the pressure difference between unit cells, heat flow by air and heat transfer.

• Proceedings of the SAREK Conference
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• 2008.11a
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• pp.605-610
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• 2008

The study aims to analyzed and identify the heat transfer characteristics of heating unit for room using 3-D numerical-analysis in order to design heating unit. The temperature comparison processes were done with various numerical conditions. In addition, the optimal conditions of heating unit design were proposed as inlet temperature, the inlet flow, heater power, and vessel size.

• Proceedings of the SAREK Conference
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• 2007.11a
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• pp.155-160
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• 2007

This study describes thermal performance of Plus50 eco-building with new technology such as power window system, green wall, structure material, etc. The Plus50 eco-building is house experimental which is constructed by Korea Institute of Construction Technology. In order to estimate thermal performance of the building, TRNSYS program and Prebid, and its sub-modules are used. The results showed that maximum heating and cooling load in the building are calculated at 1st floor and 4th floor, respectively. And also energy saving of the building is calculated as over 30% compared to conventional apartment house.

• Solar Energy
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• v.18 no.4
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• pp.23-32
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• 1998

Fuel cells supply electric power and heat at work, and their exhaust gas is comparatively clear. So they are in the limelight as one of the co-generation systems which behave friendly with the environment. Fuel cells discharge both steam and hot water. Accordingly, if we combine absorption heat pump driven by waste heat with fuel cells, we can construct an advanced energy conserving system. The purpose of this study is the objective for evaluating the possibilities of effectively utilizing waste heat of fuel cells as a heat source for the single and double effect absorption systems. Simulation studies on single and double effect absorption have been performed for water/lithium-bromide pair. The effectiveness of introducing a waste heat source of fuel cells is demonstrated. The result of this study showed that total efficiency was about 85% at rated operation and about 75% at 75% load operation. Absorption cycle moved to more strong concentration when fuel cell operated at 75% load.

• Proceedings of the KIEE Conference
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• 2009.04b
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• pp.234-236
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• 2009

본 논문에서는 연료전지 시스템에서 발생되는 저주파 리플의 전달과정과 Power Conditioning System (PCS) 회로 및 인덕터, 캐패시터와 같은 수동소자에 따른 이론적 분석 및 시뮬레이션 결과를 저주파 리플전류의 발생 양상을 이론적으로 분석한다. PCS 회로 종류는 저주파 리플전류에 영향을 미치지 않고, 인덕턴스와 캐패시턴스에 반비례하여 저주파 리플 전류가 감소함을 보여준다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.7
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• pp.1295-1302
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• 2016

In this paper, a black box, which is provided the reliability and user safety of home battery energy storage system connected with solar energy generation, is developed. In the developed scheme, a status and diagnosis data of battery management system, power conditioning system, solar energy generation and grid is measured. This status and diagnosis data is stored and displayed in the developed black box. In addition, this status and diagnosis data is stored and displayed in a monitoring system and a smart phone of user. A performance evaluation of the developed black box is carried out using emulator of home battery energy storage system connected with solar energy generation. Consequently, the developed black box is proved its superiority of the reliability and user safety.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.11
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• pp.2200-2208
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• 2009

This paper presents a novel single converter and single inverter (1Con-1Inv) topology for photovoltaic (PV)-fuel cell (FC) hybrid system and a new control scheme for the PV-FC hybrid system is then proposed. The new topology and the unique algorithm can minimize volume and production cost of the hybrid system. Moreover, system efficiency can improve due to reduction of losses of hardware components and other control factors are well regulated using just 1Con-1Inv with the help of the proposed control algorithm. The validity of proposed algorithm is verified both computer simulation using PSIM and Matlab/Simulink program and experimental with 700W of PV and 600W of FC system.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.892-893
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• 2007

Industrial interest in switched reluctance motor (SRM) drives has varied since 1850s. This has been primarily due to the emerging markets for variable speed drives in consumer and industrial products, such as home appliances, air conditioning, hand tools, fans, pump motor, etc. However, SRM has been plagued with the acoustic noise and vibration problem by input power of fixed section. Therefore, This paper offers operating characteristics by dynamic simulation through the generalization of inductance profile and estimation of inductance according to current. the control methode are applied from DSP(digital signal processor) with voltage reference and position detection.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.197-198
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• 2007

본 논문에서는 연료전지 시스템에서 발생되는 저주파 리플의 전달과정을 분석하고, PCS 회로 및 인버터 제어방식에 따른 저주파 리플 영향을 비교 분석한다. 부스트 컨버터와 풀브리지 컨버터의 입력전류 고조파 분포와 인버터 PWM 스위칭 방식에 따른 입력전류에서의 영향을 고조파 분포 및 저주파 리플 측면에서 분석한다. 풀브리지 컨버터에서 전달되는 저주파 리플 크기가 상대적으로 작은 것을 확인하고, PWM 스위칭 방식은 저주파 리플에 영향을 주지 않는다는 것을 시뮬레이션을 통하여 확인한다.

• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.225-227
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• 2006

The demand for developing the compact and cost effective commercial version of the photovoltaic power conditioning system(PCS) is now increasing and several commercial products are on the markets. In this paper, several design results of 10kW rated grid-tied photovoltaic PCS system are introduced, and several test results for the system evaluation are also described. The test results verified the validity of the proposed photovoltaic PCS system.