The influence of the calculation error of the solar azimuth parameter on the radiation prediction model was often neglected in the past studies, formulas with large error such as the Cooper equation was used. By eliminating the influence of other factors, only the solar irradiance calculation results corresponding to the different solar azimuth parameter errors were calculated and compared with the standard astronomical calendar calculation results. It was found that the error of the solar azimuth parameter not only caused an error of more than 7% for the solar irradiance calculation (when the time angle was greater than 70 degrees), but also caused a large calculation error at the transition point between sunrise and sunset. In response to the above questions, this paper improved the numerical simulation method using the Julian Day as the time variable and using the large data quantity least squares method to fit it. Not only greatly reducing the calculation error of the critical point, but also the relative error of calculated result was less than 0.2%.
BAO He-ming
,
GU Yi-fan
,
LIU Chao
,
GAO Shu-ning
,
GUAN Xin
. Effect of Calculation Error of Solar Position Algorithm on Radiation Prediction Calculation[J]. Advances in New and Renewable Energy, 2018
, 6(5)
: 387
-393
.
DOI: 10.3969/j.issn.2095-560X.2018.05.008
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