Presentation Details
Reproducibility evaluation of calibration procedures for measurement values of I-V characteristics of photovoltaic modules

Tinglin Guo, Xin Huang, Yuehua Yang, He Wang, Hong Yang.

Xi’an Jiaotong University, Xi’an, China

Abstract


IEC 60891:2021 is the international benchmark for photovoltaic module I-V curve correction. In this work, IEC 60891 CP4 was employed to investigate the impact of series resistance on the reproducibility of the I-V curve after conversion of photovoltaic modules. In order to elucidate the influence of series resistance more clearly, three distinct data points within the high-voltage region of the I-V curve were selected for calculating series resistance. The maximum power and its reproducibility limit were compared under identical temperature conditions but varying irradiance levels, as well as under identical irradiance at different temperatures. The findings indicate that the closer the irradiance is to 1000 W/m², the more reliable the conversion results become. Trends in maximum power and its reproducibility support this conclusion. Notably, for TOPCon modules, when the selected data point approaches the open-circuit voltage during the conversion process, the final conversion result is more accurate. Additionally, temperature has a negligible effect on the difference in maximum power between the three cases post-conversion, with minimal impact on the reproducibility limit. This study holds significant implications for the correction of outdoor I-V curve measurements.

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