New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Transmission Loss from Voltage Drop in a DC Cable for a Floating Photovoltaic System in a Reservoir

저수지 내 수상태양광의 전압 강하에 의한 직류 송전 손실

  • Bhang, Byeong Gwan (Department of Electrical Engineering, Konkuk University) ;
  • Woo, Sung Cheol (Department of Electrical Engineering, Konkuk University) ;
  • Lee, Wonbin (Department of Electrical Engineering, Konkuk University) ;
  • Choi, Jin Ho (Department of Electrical Engineering, Konkuk University) ;
  • Shin, SeungWook (Rural Research Institute, Korea Rural Community Corporation) ;
  • Lee, ChulSung (Rural Research Institute, Korea Rural Community Corporation) ;
  • Park, MiLan (Rural Research Institute, Korea Rural Community Corporation) ;
  • Won, Changsub (R&D Center, Scotra) ;
  • Ahn, HyungKeun (Department of Electrical Engineering, Konkuk University)
  • Received : 2020.01.13
  • Accepted : 2020.02.18
  • Published : 2020.03.25
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Abstract

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.

Keywords

References

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