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유한 요소 도구를 이용한 NPT IGBT의 열 특성 해석
류세환(Sehwan Ryu),이명수(Myungsoo Lee),원창섭(Changsub Won),안형근(Hyungkeun Ahn),한득영(Deukyoung Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
As the power density and switching frequency increase, thermal analysis of power electronics system becomes imperative. The analysis provides valuable information on the semiconductor rating, long-term reliability. In this paper, thermal distribution of the Non Punchthrough(NPT) Insulated Gate Bipolar Transistor has been studied. For analysis of thermal distribution, we obtained results by using finite element simulator, Ansys and thermal distributions form experiments.
저수지 내 수상태양광의 전압 강하에 의한 직류 송전 손실
방병관(Byeong Gwan Bhang),우성철(Sung Cheol Woo),이원빈(Wonbin Lee),최진호(Jin Ho Choi),신승욱(SeungWook Shin),이철성(ChulSung Lee),박미란(MiLan Park),원창섭(Changsub Won),안형근(HyungKeun Ahn) 한국신재생에너지학회 2020 신재생에너지 Vol.16 No.1
In Floating PV (Photovoltaic) systems, PV modules are installed on water by utilizing the surface of idle water such as a reservoir and multipurpose dam. A floating PV system, therefore, has the advantage of efficiency in national land use and improved energy yield owing to cooling effect compared to on-land PV systems. Owing to the limitation of installation environment for a floating PV system, the system, however, has the disadvantage of an increase in transmission distance of DC (Direct current) cables. A longer transmission distance of a DC cable results in greater power loss due to a voltage drop. This leads to a decline in economic feasibility for the floating PV system. In this paper, the economic analysis for 10 floating PV systems installed in a reservoir has been conducted in terms of a change in annual power sales according to the variation of transmission losses depending on the factors affecting the voltage drop, such as transmission distance, cross-section area of underwater cable, the presence of joint box, and PV capacity.