• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.136.2-136.2
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• 2011

In this work, we analyzed correlations between life-cycle greenhouse gas (GHG) emissions and life-cycle cost of energy resources. Energy resources studied in this paper include coal, natural gas, nuclear power, hydropower, geothermal energy, wind power, solar thermal energy, and solar photovoltaic energy, and all of them are used to generate electricity. We calculated the mean values, ranges of maximum minus minimum values, and ranges of 90% confidence interval of life-cycle GHG emissions and life-cycle cost of each energy resource. Based on the values, we plotted them in two dimensional graphs to analyze a relationship and characteristics between GHG emissions and cost. Besides, to analyze the technical maturity, the GHG emissions and the range of minimum and maximum values were compared to each other. For the electric generation, energy resources are largely inverse proportional to the GHG emission and the corresponding cost.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.7
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• pp.1211-1217
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• 2007

In this paper, a 10kVA PV inverter applying Incremental Conductance(IncCond) method for maximum power point tracking WIS developed and its performance tests were carried out. Modeling and simulation of PV array and system controller was performed using PSCAD/EMTDC, an electromagnetic transient analysis program. After comparison and analysis of Perturbation & Observation (P & O) and IncCond method, a PV inverter based on IncCond method was designed and manufactured. Grid interface transient characteristics including start-up, normal operation, and fault operation were tested, which verified the usefulness of the proposed system. In the near future, commercialization process will proceed through additional extensive tests of transients.

• Journal of Electrical Engineering and Technology
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• v.10 no.5
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• pp.1983-1988
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• 2015

This paper proposes the enhanced application of superconducting magnetic energy storage (SMES) for the effective compensation of power fluctuations based on the interleaving technique. With increases in demand for renewable energy based photovoltaic (PV) generation system, the output power fluctuations from PV generation system due to sudden changes in environmental conditions can cause serious problems such as grid voltage and frequency variations. To solve this problem, the SMES system is applied with its superior characteristics with respect to high power density, fast response for charge and discharge operations, system efficiency, etc. In particular, the compensation capability is effectively improved by the proposed interleaving technique based on its parallel structure. The dynamic performance of the system designed using the proposed method is evaluated with several case studies through time-domain simulations.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.26 no.8
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• pp.56-64
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• 2012

This paper proposes a novel maximum power point tracking (MPPT) control algorithm considering radiation to improve efficiency of PV system. The proposed algorithm is composed perturb and observe (PO) method and constant voltage (CV) method. PO method is simple to realize and CV method is possible to tracking MPP with low radiation. Response characteristics of proposed algorithm are compared to conventional MPPT algorithm such as PO method, IC method and CV method with radiation variation. This paper proves the validity of proposed algorithm through the analysis results.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.10
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• pp.23-27
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• 2011

In this paper, material handing cleanroom stocker system for thin film solar cell line of photovoltaic industry and liquid crystal display line of flat panel display industry was selected for the study. Optimum solution for stocker system's CPS(Contactless Power Supply) is approached by changing the motion pattern, optimizing design & production, and analyzing characteristics of the power system. As a result, acceleration time of X-Axis changed from 3 sec to 4 sec, changed the input characteristic of CPS within approximately 11[kW]. This result shows that extending acceleration time of the X-Axis in Stocker Crane's motion pattern can reduce the capacity of the CPS, thus saving the manufacturing cost.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.410-412
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• 2008

본 논문에서는 고정형 30KW태양광발전시스템 운전특성을 해석하고 이론을 바탕으로 실 시스템을 적용 운용시 시스템의 운전특성 및 발전량을 비교 분석하였다. 장기적인 일사량 측정 데이터 수집을 통하여 그래프화, 모티터링 시스템에 관한 연구를 살펴보았다.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.615-617
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• 2008

본 논문에서는 태양에너지 실증연구단지에 설치된 서로 다른 2기 3kW급 태양광발전 시스템에 대한 5년간의 데이터 분석을 통하여 시스템 구성요소인 태양전지와 인버터의 효율 특성 및 시스템의 운전특성의 경년변화에 대하여 비교분석하였다. A 시스템의 경우 PV 어레이 변환효율은 2004년 이후 약 0.2% 정도로 지속적으로 떨어지는 추세를 나타내고 있으며, B 시스템의 경우 인버터의 효율은 약 0.5% 정도로 지속적으로 떨어지는 추세를 나타내고 있다. 2기의 PV 시스템의 발전효율, 이용율 및 성능비는 모두 2004년 이후 지속적인 효율저하를 나타내고 있음을 확인 하였다.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.537-538
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• 2006

태양광 발전시스템의 성능평가 및 분석을 위하여 실증단지 및 시범사업으로 설치 운영하고 있으며, 주택용 3KW 계통연계형 태양광 발전시스템도 10만호 보급사업의 일환으로 추진 중에 있다. 본 논문에서는 이와 같이 추진 중인 3KW 태양광 발전시스템의 기본구성과 설치된 PV시스템의 각종 구성요소 기기 특히 계통연계형 인버터에 대하여 알아보며, 실증시험을 위하여 설치된 모니터링 시스템에서 수집된 데이터를 토대로 PV시스템의 성능을 위한 운전 특성을 분석하였다.

• Journal of the Korean Solar Energy Society
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• v.25 no.3
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• pp.47-52
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• 2005

Normally if sunlight is directed on a solar cell without any increasing in temperature, the amount of absorption energy per unit area of each cell is increasing. In a silicon solar cell. however, cell conversion efficiency decreases with the increase of temperature. Therefore, to maintain cell conversion efficiency under normal condition, it is necessary to keep the cell at operating temperature. We tried to design and make new hybrid panel with cooling system to prevent increasing of temperature on cell, collect and use thermal energy more effectively. We compared performance of this new hybrid panel with current thermal panel. We also evaluated conversion efficiency, thermal capacity and confirmed cooling effects from thermal absorption efficiency.

• Journal of IKEEE
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• v.17 no.3
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• pp.365-370
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• 2013

Power MOSFET is developed in power savings, high efficiency, small size, high reliability, fast switching, and low noise. Power MOSFET can be used in high-speed switching transistors devices. Recently attention given to the motor and the application of various technologies. Power MOSFET is a voltage-driven approach switching device and designed to handle on large power, power supplies, converters, motor controllers. In this paper, the 400 V Planar type, and the trench type for realization of low on-resistance are designed. Trench Gate Power MOSFET Vth : 3.25 V BV : 484 V Ron : 0.0395 Ohm has been optimized.