Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated Spectroradiometer
The international standard IEC62670-3 (International Electrotechnical Committee) “Photovoltaic Concentrators (CPV) Performance Testing—Part 3—Performance Measurements and Power Rating” sets the guidelines for power measurements of a CPV device, both in indoor and outdoor conditions. When measuring i...
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doaj-d94486bdc741437db4fa2b930417fb292020-11-24T21:44:29ZengMDPI AGApplied Sciences2076-34172018-01-018218610.3390/app8020186app8020186Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated SpectroradiometerDiego Pavanello0Roberto Galleano1Robert P. Kenny2Directorate C—Energy, Transport and Climate, European Commission Joint Research Centre, I-21027 Ispra, ItalyDirectorate C—Energy, Transport and Climate, European Commission Joint Research Centre, I-21027 Ispra, ItalyDirectorate C—Energy, Transport and Climate, European Commission Joint Research Centre, I-21027 Ispra, ItalyThe international standard IEC62670-3 (International Electrotechnical Committee) “Photovoltaic Concentrators (CPV) Performance Testing—Part 3—Performance Measurements and Power Rating” sets the guidelines for power measurements of a CPV device, both in indoor and outdoor conditions. When measuring in outdoor conditions, the acquired data have to be filtered a posteriori, in order to select only those points measured with ambient conditions close to the Concentrator Standard Operating Conditions (CSOC). The most stringent requirement to be met is related to the three Spectral Matching Ratios (SMR), which have all to be within the limit of 1.00 ± 0.03. SMR are usually determined by the ratio of the currents of component cells to monitor the outdoor spectral ratio conditions during the CPV device power measurements. Experience demonstrates that obtaining real world data meeting these strict conditions is very difficult in practice. However, increasing the acceptable range would make the entire filtering process less appropriate from a physical point of view. Given the importance of correctly measuring the SMR, an estimation of their associated measurement uncertainties is needed to allow a proper assessment of the validity of the 3% limit. In this study a Monte Carlo simulation has been used, to allow the estimation of the propagation of uncertainties in expressions having the and integral form. The method consists of applying both random and wavelength correlated errors to the measured spectra and to the measured spectral responses of the three CPV cell junctions, according to the measurement uncertainties of the European Solar Test Installation (ESTI). The experimental data used in this study have been acquired during clear sky conditions in May 2016, at ESTI’s facilities in Ispra, northern Italy (45°49′ N 8°37′ E).http://www.mdpi.com/2076-3417/8/2/186concentrator photovoltaicsmeasurement uncertaintyInternational standardsMonte Carlo simulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Diego Pavanello Roberto Galleano Robert P. Kenny |
spellingShingle |
Diego Pavanello Roberto Galleano Robert P. Kenny Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated Spectroradiometer Applied Sciences concentrator photovoltaics measurement uncertainty International standards Monte Carlo simulation |
author_facet |
Diego Pavanello Roberto Galleano Robert P. Kenny |
author_sort |
Diego Pavanello |
title |
Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated Spectroradiometer |
title_short |
Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated Spectroradiometer |
title_full |
Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated Spectroradiometer |
title_fullStr |
Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated Spectroradiometer |
title_full_unstemmed |
Uncertainty Propagation of Spectral Matching Ratios Measured Using a Calibrated Spectroradiometer |
title_sort |
uncertainty propagation of spectral matching ratios measured using a calibrated spectroradiometer |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2018-01-01 |
description |
The international standard IEC62670-3 (International Electrotechnical Committee) “Photovoltaic Concentrators (CPV) Performance Testing—Part 3—Performance Measurements and Power Rating” sets the guidelines for power measurements of a CPV device, both in indoor and outdoor conditions. When measuring in outdoor conditions, the acquired data have to be filtered a posteriori, in order to select only those points measured with ambient conditions close to the Concentrator Standard Operating Conditions (CSOC). The most stringent requirement to be met is related to the three Spectral Matching Ratios (SMR), which have all to be within the limit of 1.00 ± 0.03. SMR are usually determined by the ratio of the currents of component cells to monitor the outdoor spectral ratio conditions during the CPV device power measurements. Experience demonstrates that obtaining real world data meeting these strict conditions is very difficult in practice. However, increasing the acceptable range would make the entire filtering process less appropriate from a physical point of view. Given the importance of correctly measuring the SMR, an estimation of their associated measurement uncertainties is needed to allow a proper assessment of the validity of the 3% limit. In this study a Monte Carlo simulation has been used, to allow the estimation of the propagation of uncertainties in expressions having the and integral form. The method consists of applying both random and wavelength correlated errors to the measured spectra and to the measured spectral responses of the three CPV cell junctions, according to the measurement uncertainties of the European Solar Test Installation (ESTI). The experimental data used in this study have been acquired during clear sky conditions in May 2016, at ESTI’s facilities in Ispra, northern Italy (45°49′ N 8°37′ E). |
topic |
concentrator photovoltaics measurement uncertainty International standards Monte Carlo simulation |
url |
http://www.mdpi.com/2076-3417/8/2/186 |
work_keys_str_mv |
AT diegopavanello uncertaintypropagationofspectralmatchingratiosmeasuredusingacalibratedspectroradiometer AT robertogalleano uncertaintypropagationofspectralmatchingratiosmeasuredusingacalibratedspectroradiometer AT robertpkenny uncertaintypropagationofspectralmatchingratiosmeasuredusingacalibratedspectroradiometer |
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