IEC 60904-9:2020 © IEC 2020
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Figure A.2 – Reference SR curves for typical PV technologies
Procedure:
a) Select the PV technology (T1..T5) from Table A.1, which has the best agreement with
measured SR data of the PV device. If required, define a new reference curve
(Technology) by modifying parameters
a
1
,
a
2
,
b
1
and
b
2
.
b) Use the reference SR curve of step a) to model a minimum of k=4 dispersion SR curves,
by applying the dispersion parameter x (default = 5 nm). If required, adjust the parameter
x to the actual needs.
c) Using the spectral irradiance
data of the solar simulator, calculate the
spectral mismatch
factors SMM(k) between the reference SR curve and each one of its k=4 dispersions in
accordance with IEC 60904-7.
d) Calculate the spectral mismatch errors, which are given by SMM(k) – 1.
e) Plot the spectral mismatch errors as function of the dispersion. The slope of the
regression line is a direct indicator for the robustness of spectral irradiance regarding
spectral mismatch error (Figure A.3).
The procedure can be performed with spectral irradiance data of various solar simulators. The
results can be used as decision basis for identifying the solar simulator with best robustness
for spectral mismatch error for the particular PV technology being modelled.
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No further reproduction or distribution is permitted.
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IEC 60904-9:2020 © IEC 2020
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