• Title/Summary/Keyword: Tilted surface irradiance

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Variation of Solar Photovoltaic Power Estimation due to Solar Irradiance Decomposition Models (일사량 직산분리 모델에 따른 표준기상연도 데이터와 태양광 발전 예측량의 불확실성)

  • Jo, Eul-Hyo;Lee, Hyun-Jin
    • Journal of the Korean Solar Energy Society
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    • v.39 no.3
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    • pp.81-89
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    • 2019
  • Long-term solar irradiance data are required for reliable performance evaluation and feasibility analysis of solar photovoltaic systems. However, measurement data of the global horizontal irradiance (GHI) are only available for major cities in Korea. Neither the direct normal irradiance (DNI) nor the diffuse horizontal irradiance (DHI) are available, which are also needed to calculate the irradiance on the tilted surface of PV array. It is a simple approach to take advantage of the decomposition model that extracts DNI and DHI from GHI. In this study, we investigate variations of solar PV power estimation due to the choice of decomposition model. The GHI data from Korea Meteorological Administration (KMA) were used and different sets of typical meteorological year (TMY) data using some well-known decomposition models were generated. Then, power outputs with the different TMY data were calculated, and a variation of 3.7% was estimated due to the choice of decomposition model.

Estimation of Optimal Angle for PV Panels Considering Building's Shadow in Daejeon (대전지역 건물음영을 고려한 PV 최적각도 산정)

  • Lee, Jung-Tae;Kim, Hyun-Goo;Kang, Yong-Heack;Yun, Chang-Yeol;Kim, Chang Ki;Kim, Jin-Young;Kim, Bo-Young
    • Journal of the Korean Solar Energy Society
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    • v.40 no.3
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    • pp.43-52
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    • 2020
  • By blocking irradiance, shadows cast by high-rise buildings in urban areas can reduce the power generation efficiency of PV panels installed on low-rise buildings. As the conventionally installed PV panel is not suitable for the urban environment, which is unfavorable for power generating, a more radical solution is required. This study aims to help solve this problem by estimating the optimal PV panel angle. Using the proposed method, the optimal PV angle was calculated by considering shadows that could be cast by nearby buildings throughout the year, and the correlation between solar shading and elevation angle was discovered based on the calculated data.