Data sampling speed versus energetic measurement errors in photovoltaic system monitoring

Proceedings of 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion - WCPEC (A Joint Conference of PVSC, PVSEC and PSEC) Pub Date : 1994-12-05 DOI:10.1109/WCPEC.1994.520061

K. Kurokawa

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引用次数: 1

Abstract

To measure solar irradiation and photovoltaic array output energy, measuring accuracy cannot be guaranteed unless the data sampling interval is appropriately selected. From this viewpoint, actual irradiance had been measured by comparatively high speed sampling of 1 to 4 seconds for 44 months and the daily errors of numerical integral has been estimated for various step sizes. Approximation formulae of the error versus the step size have been statistically obtained as well as their probability density function covering /spl plusmn/4/spl sigma/. Finally a nomograph is presented to decide an appropriate sampling interval. A concluding example shows that the deviating component of the error exceeding /spl plusmn/1% can happen once for every 1 month or 6 months if the step size is selected as 105 seconds or 65.5 seconds, in each of which the total error becomes -0.0485/spl plusmn/1% or -0.0336/spl plusmn/1% including an average error component.

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光伏系统监测中数据采样速度与能量测量误差的关系

要测量太阳辐照度和光伏阵列输出能量，必须选择合适的数据采样间隔，才能保证测量精度。从这个角度出发，在44个月的时间里，以1 ~ 4秒的相对高速采样测量了实际辐照度，并估计了不同步长下数值积分的日误差。统计得到了误差与步长的近似公式，以及它们的概率密度函数/spl plusmn/4/spl sigma/。最后给出了一个诺线图来确定一个合适的采样间隔。最后算例表明，当步长选择105秒或65.5秒时，误差超过/spl plusmn/1%的偏离分量每1个月或6个月出现一次，每次总误差分别为-0.0485/spl plusmn/1%或-0.0336/spl plusmn/1%，其中包括平均误差分量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion - WCPEC (A Joint Conference of PVSC, PVSEC and PSEC)

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