Global horizontal irradiance clear sky models : implementation and analysis.
Global horizontal irradiance clear sky models : implementation and analysis.
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DOI：
10.2172/1039404
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
J. Stein;Clifford W. Hansen;M. Reno
中科院分区：
文献类型：
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作者：
J. Stein;Clifford W. Hansen;M. Reno
晴朗天空模型估计无云天空下的地面太阳辐射，作为太阳高度角、地点高度、气溶胶浓度、水蒸气和各种大气条件的函数。本报告概述了一些全球水平辐照度（GHI）晴空模型，从非常简单到复杂。晴空模式的验证需要将模式结果与晴空期间测得的辐照度进行比较。为了便于验证，我们提出了一种新的算法，用于自动识别晴空周期的时间序列的GHI测量。我们使用来自30个不同站点的测量数据，共计约300个站点-年的数据来评估所选晴空模型的性能。我们分析了这些误差在时间和位置上的变化。在所有位置和时间的平均误差方面，我们发现，正确考虑所有大气参数的复杂模型比其他模型稍微准确一些，但是，主要在低海拔地区，可以从一些简单的模型中获得相当的精度。然而，较简单的模型通常会显示出随时间和季节而变化的误差，而复杂模型的误差随时间变化较小。
Clear sky models estimate the terrestrial solar radiation under a cloudless sky as a function of the solar elevation angle, site altitude, aerosol concentration, water vapor, and various atmospheric conditions. This report provides an overview of a number of global horizontal irradiance (GHI) clear sky models from very simple to complex. Validation of clear-sky models requires comparison of model results to measured irradiance during clear-sky periods. To facilitate validation, we present a new algorithm for automatically identifying clear-sky periods in a time series of GHI measurements. We evaluate the performance of selected clear-sky models using measured data from 30 different sites, totaling about 300 site-years of data. We analyze the variation of these errors across time and location. In terms of error averaged over all locations and times, we found that complex models that correctly account for all the atmospheric parameters are slightly more accurate than other models, but, primarily at low elevations, comparable accuracy can be obtained from some simpler models. However, simpler models often exhibit errors that vary with time of day and season, whereas the errors for complex models vary less over time.