Publicação
Assessment of the IEC 60891 norm conversion methods under outdoor test conditions
| Resumo: | In this work the applicability of the IEC 60891 norm – Procedures for temperature and irradiance corrections to measured I–V characteristics – for translations to the Standard Test Condition (STC) is analysed. Focus is given on the 1st and 2nd procedures of the norm, as these were found more suitable for translations to STC than the 3rd method. An outdoor roof-site in The Hague (The Netherlands) was assembled, with a comprehensive set of calibrated instruments, to measure in-plane spectral and broadband irradiance, as well as individual I–V curves for two different PV modules (c-Si and mc-Si). For the norm evaluation, a 1-diode model for PV modules was developed and the extraction methods for each required parameter were studied. The results were similar for both modules and both, 1st and 2nd, conversion methods of the norm. The irradiance is not limiting the accuracy of the conversion if only highly correlated values for short circuit current vs. irradiance are used. Best results were found for correlations of 0.98 or greater, yielding accuracies better than 3% for both STC conversion methods. Translations with good accuracy were also found by self-referencing the PV devices. The main conclusion is that by proper data selection, the irradiance range specified in the correction method of the norm can be extended. Furthermore, the subject of accessing the spectral radiation distribution by means of correlating broadband measurements using available models was explored. To model the spectral distribution SMARTS2 was employed with a dataset from ARM database, however, the used dataset was found inappropriate for the assessment. This MSc thesis was developed within the Erasmus framework at Copernicus Institute for Sustainable Development and Innovation of the Utrecht University. All experimental work was performed during an internship at EKO Instruments Europe B.V.. |
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| Autores principais: | Pó, José Mário da Costa |
| Assunto: | Fotovoltaico Performance de PV Conversões STC Teses de mestrado - 2011 |
| Ano: | 2011 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | In this work the applicability of the IEC 60891 norm – Procedures for temperature and irradiance corrections to measured I–V characteristics – for translations to the Standard Test Condition (STC) is analysed. Focus is given on the 1st and 2nd procedures of the norm, as these were found more suitable for translations to STC than the 3rd method. An outdoor roof-site in The Hague (The Netherlands) was assembled, with a comprehensive set of calibrated instruments, to measure in-plane spectral and broadband irradiance, as well as individual I–V curves for two different PV modules (c-Si and mc-Si). For the norm evaluation, a 1-diode model for PV modules was developed and the extraction methods for each required parameter were studied. The results were similar for both modules and both, 1st and 2nd, conversion methods of the norm. The irradiance is not limiting the accuracy of the conversion if only highly correlated values for short circuit current vs. irradiance are used. Best results were found for correlations of 0.98 or greater, yielding accuracies better than 3% for both STC conversion methods. Translations with good accuracy were also found by self-referencing the PV devices. The main conclusion is that by proper data selection, the irradiance range specified in the correction method of the norm can be extended. Furthermore, the subject of accessing the spectral radiation distribution by means of correlating broadband measurements using available models was explored. To model the spectral distribution SMARTS2 was employed with a dataset from ARM database, however, the used dataset was found inappropriate for the assessment. This MSc thesis was developed within the Erasmus framework at Copernicus Institute for Sustainable Development and Innovation of the Utrecht University. All experimental work was performed during an internship at EKO Instruments Europe B.V.. |
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