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A revision of IEC 60891 2nd Edition 2009-12: Data correction procedures 1 and 2 PV module performance at Murdoch University

Blagojevic, Tim (2016) A revision of IEC 60891 2nd Edition 2009-12: Data correction procedures 1 and 2 PV module performance at Murdoch University. Honours thesis, Murdoch University.

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The focus of this project is to review and effectively assess the first two photovoltaic module electrical performance data correction procedures contained in the international engineering standard IEC 60891: “Photovoltaic Devices- Procedures for temperature and irradiance corrections to measured I-V characteristics.” The formulated workings of the project were used to assess the effectiveness of the correction methods in translating electrical performance data for determining the degradation or performance of photovoltaic modules.

A preliminary literature review of concepts involved in the implementation of project procedures was conducted, so that appropriate experimental testing conditions could be formulated. This project covers information regarding factors that may affect photovoltaic module performance variation and degradation.

Over a period of months in autumn/winter, outdoor field electrical performance data for different PV module technologies at the Murdoch University location was recorded and processed. The data collected was obtained under varying atmospheric conditions, with the tilts and orientations of the modules altered to change the total amount and nature of solar irradiation reaching the modules.

The algebraic equations of the first and second standard correction procedures utilised parameters with values that could be measured directly from the outdoor testing of modules, or deduced from electrical performance data obtained from testing modules indoors at known values of irradiance, temperature and atmospheric spectra.

Indoor performance data simulated with solar irradiance levels and cell temperatures recognised as those matching international standard test conditions, was obtained for use in effectively implementing the correction procedures. The data was also independently analysed and compared.

Outdoor module test performance data was corrected with both correction procedures and collated for analysis. The results highlighted the effects of and correlations between factors that influence module I-V curve dynamics.

When implemented for data translation, “correction procedure one” was found to produce a range of maximum power mismatch accuracy levels from 0.09 to 22.97% with an average accuracy mismatch level of 9.54%. “Correction procedure two” was found to produce a range of accuracy maximum power mismatch levels of 0.19 to 28.64%, with an average accuracy mismatch level of 8.58%.
An assessment of the correction procedures showed that they could be effectively used to gauge module degradation or for comparison of module performance against factory specifications. Both methods showed similar variations in accuracy, with “correction procedure 2” being better suited to situations where the irradiance level difference between two data sets is more than 20%. “Correction procedure 2” has more working parameters and takes more time to establish for correct implementation.

Publication Type: Thesis (Honours)
Murdoch Affiliation: School of Engineering and Information Technology
Supervisor: Parlevliet, David
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