Publications:
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Proceedings of the 29th European PV Solar Energy Conference and Exhibition
(2014)
3-936338-34-5
Abstract: The present paper describes the implementation of a method to perform measurements at different irradiance levels on PV devices in accordance with the standard IEC-61853-1: “Irradiance and temperature performance measurements and Power Rating”. Previously we have reported Power Rating measurements on PV devices of different technologies using uncalibrated mesh filters. These were not strongly attenuating and hence needed to be stacked to arrive to irradiance levels as low as 100 W/m2 both in solar simulators and in natural sunlight. Due to spatial non-uniformities at low irradiance levels poor results were obtained, especially for thin film modules. New high quality commercially available meshes have been obtained and it is shown that they may be used to arrive at low irradiance levels with excellent results for full-size PV modules. |
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, page 2290 - 2295.
2014
3-936338-34-5
Abstract: We present calculations for PV energy yield over continental-scale regions. The calculations take into account the effects of reflectance at shallow angles of incidence, the influence of low irradiance and module temperature on module power output, and the influence of air temperature and wind speed on module temperature. The study has been made for a region comprising Eurasia and Africa, excluding arctic areas. Results show that for crystalline silicon the effects of angle-of-incidence are rather modest, at 2-4% loss of output, while temperature and irradiance effects may range from -20% to +5% depending on location. Considering the cooling effect of wind may change the expected yearly energy output by up to +6-7% in windy desert areas while in other areas the effect is minimal. Recent work on calculating spectrally resolved irradiance from satellite has made it possible for the first time to estimate the effect of spectral variations on PV performance. Preliminary results show that in cloudy tropical areas this could mean up to 6% higher energy output for CdTe modules while the effect would be very small in desert regions. |
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, page 2158 - 2162.
2014
3-936338-34-5
Abstract: A steady-state solar simulator at INTA-SPASOLAB has been upgraded for electric performance (EP) measurements of triple junction (TJ) GaInP/InGaAs/ Ge space solar cells at low and high irradiance levels between 0.03 and 5.3 AM0 solar constants (equivalent to 41 and 7.2 kWm-2). By this upgrading, EP measurements can now be performed at low-high intensity and under controlled low and high temperature conditions between -160ºC and +300ºC. Precautions to be taken, regarding simulator adjustment with single component reference cells, when transiting to EP measurements at higher irradiance levels are included. Measured current-voltage curves in the achieved irradiance range are presented, indicating obtained fill factor differences. |
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, page 3214 - 3218.
2014
3-936338-34-5
Abstract: This paper describes the characterization of uncalibrated light attenuating filters, based on industrial metallic meshes. This work investigates the light attenuating properties as well as the influence on spectral energy distribution of woven wire meshes when used under simulated sunlight. These meshes have a high potential for use as attenuation filters for measurement of PV device performance at irradiances below the nominal simulator irradiance, based on the measurements and analysis presented. |
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, page 3447 - 3451.
2014
3-936338-34-5
Abstract: The wavelength calibration of a monochromator based differential spectral responsivity (DSR)-facility becomes of crucial importance if the spectral responsivities (SR) of solar cells under test differ significantly from the SR of the reference detector. Since the latter is mainly based on crystalline silicon, this problem is of major importance for the calibration of spectrally filtered reference solar cells as well as for all types of thin films solar cells including organic photovoltaic (PV). Here we show a new traceability chain for the wavelength calibration at PTB using a Fourier-Transform-Spectroradiometer (FTS). The FTS is calibrated against an external HeNe-laser in order to correct for misalignment of the internal optics and the internal HeNe-laser. The FTS is calibrated radiometrically against a standard lamp for correction of the SR of the internal detectors. Hence the FTS is traceable to the SI-unit system. Then an array-spectroradiometer is calibrated against the FTS using the tunable quasi-monochromatic radiation of a DSR-facility in the whole spectral range of the array-spectroradiometer. Thus the wavelength scale of this array-spectroradiometer is traceably to the SI and is then applied for wavelength calibration of PTB’s DSR facilities. |
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