Programm Photovoltaik Ausgabe 2009 ... - Bundesamt für Energie BFE

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late the mismatch factor M and through this apply spectral mismatch correction at STC or to any other
desired AirMass spectrum [1].
The SR measurement will be installed on the new solar simulator (Pasan
IIIb). In fact this is already equipped with a filter magazine. For the latter it is
currently in progress the development of an automated system for the filter
positioning in front of the lamps. This project is conducted in collaboration
with the institute ICIMSI also part of SUPSI where two students are working
on this within a semester work. In the Figure 4 are presented some component
plans for the automation. The complete system is foreseen for end of
January 2009.
Figure 4: Reconstruction of Flash (up) and Magazine (down) of Pasan IIIb
with additional components for automate filter positioning.
The SR measurement (automate filter positioning and data acquisition)
should be implemented within the Pasan IIIB software.
Figure 5: HR2000+ spectroradiometer from Ocean Optics and simplified system configuration for flash
spectrum monitoring at ISAAC
Concerning the monitoring of the flash Spectrum of the pulsed solar simulators, the solution proposed
by Ocean Optics (UK) in collaboration with GMP (CH) consists in a composition of two CCD spectroradiometers
sensitive in ranges 200-1100nm and 900-1700nm respectively.
Figure 5 shows some parts of the system and a simplified representation of its final configuration. This
solution leads to a better accuracy and wider wavelength range with respect to the case with a single
spectroradiometer of same technology. As far some technical issues still need to be solved from the
manufacturer. In fact this type of measurement is quite complex because the integration time must
stay within the flash pulse (2ms) and also the measurement of the two spectroradiometers need to be
synchronized.
This system will suit also for outdoor application (measurement of sunlight spectrum and second calibration
of the actual spectrometer fixed on the roof of ISAAC institute).
With the purpose to decrease spectral mismatch errors on thin film measurement 2 new filtered c-Si
reference cells with a-Si and CdTe spectral responses have been purchased at ISAAC.
The motivation at ISAAC for the implementation of the Spectral Response and flash Spectrum monitoring
are essentially the following:
o This upgrade will enable the verification of the class A on both PASAN Solar Simulators and this
also at lower irradiance levels. The latter is required for the accreditation of IV measurements at
different irradiance levels also foreseen at ISAAC. Similarly this will allow the accreditation of
the full indoor matrix measurement, meant as the power as a function of irradiance and temperature
levels (very useful for outdoor performance and energy rating evaluation).
o As previously mentioned the spectrum monitoring in addition to the spectral response measurement
improve on the accuracy of IV measurement prediction at STC through spectral mismatch
correction. This aspect is also required for the accreditation of IV measurement at STC,
according to IEC 60901-1, for Thin Film module.
Centrale di test ISAAC-TISO, D. Chianese, SUPSI, DACD, ISAAC-TISO
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