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General method to obtain recommended tilt and azimuth angles for photovoltaic systems worldwide

机译:获取全球光伏系统推荐倾斜角和方位角的通用方法

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摘要

In this study, a general method to obtain the 95% generation bound for photovoltaic (PV) systems worldwide was developed using a clear-sky model and then validated using ground surface observations, satellite-derived data, and typical meteorological year (TMY) files. The 95% generation bound for plane-of-array (POA) irradiation is used to provide the recommended tilt and azimuth angles where the loss fraction of POA irradiation is limited to 5% of the maximum POA irradiation. It was found that the 95% generation bound by this method behaves almost the same as that under real weather conditions. Cooling season was proposed for the application of PV-powered air conditioners. When compared with the annual 95% generation bound, the cooling-season 95% generation bound in Hong Kong covered a smaller range of tilt angles but much larger range of azimuth angles. Diffuse ratio is one of the most important factors influencing the 95% generation bound, making it a comparable or conservative estimate when compared to the results obtained by local irradiance data. Latitude is another important factor that influences the 95% generation bound. At lower latitude, the 95% generation bound locates at lower tilt angles and has a flatter line due to the smaller value of solar zenith angle around solar noon. The distribution of accumulated direct normal irradiance (DNI) in the morning and afternoon hours also influences the 95% generation bound. The contour lines, as well as the 95% generation bounds (based on ground surface observations and TMY files), are shifted some degrees toward the east or west.
机译:在这项研究中,使用晴空模型开发了一种获取全球光伏(PV)系统95%发电约束的通用方法,然后使用地面观测,卫星数据和典型气象年(TMY)文件进行了验证。 。阵列平面(POA)辐射的95%生成用于提供推荐的倾斜角和方位角,其中POA辐射的损耗分数限制为最大POA辐射的5%。结果发现,用这种方法约束的95%发电行为与实际天气条件下的发电行为几乎相同。提议为光伏动力空调应用提供冷却季节。与每年95%的发电量边界相比,香港的冷季95%发电量边界覆盖的倾角范围较小,但方位角的范围较大。漫射率是影响95%生成范围的最重要因素之一,与通过局部辐照度数据获得的结果相比,它是可比较的或保守的估计。纬度是影响95%生成范围的另一个重要因素。在较低的纬度下,由于太阳正午前后太阳天顶角的值较小,因此95%的生成边界位于较低的倾斜角处,并具有一条较平的线。早晨和下午的累积直接法向辐照度(DNI)的分布也会影响95%的发电范围。等高线以及95%的生成边界(基于地面观测和TMY文件)向东或向西移动了一定程度。

著录项

  • 来源
    《Solar Energy》 |2018年第1期|46-57|共12页
  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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