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Title:
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PV-Wirefree versus conventional PV-systems: detailed analysis of difference in energy yield between series and parallel connected PV-modules
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Author(s):
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Published by:
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Publication date:
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ECN
Solar Energy
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1-6-2004
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ECN report number:
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Document type:
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ECN-RX--04-074
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Conference Paper
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Number of pages:
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Full text:
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4
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Download PDF
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Presented at: 19th European Photovoltaic Solar Energy Conference and Exhibition, Paris, France, 7-11 juni 2004.
Abstract:
In the past several attempts have been made to measure the difference
in energy yield between acmodules, string systems and array systems.
Unfortunately measuring and comparing the output is difficult since
the compared systems use different inverters, different modules and
are operating at different locations. A new pv-system concept, called
PV-wirefree, is based on parallel-connected modules using aluminium
current carrying mounting frames. The expectations are that parallel
connected systems will produce more energy due to less influence of
partial shading and a better matching of individual modules. To check
whether these assumptions are indeed correct, a test rig has been set
up where, by means of relays, the module interconnection can be changed
from parallel to series instantly. An automatic measuring system continuously
measured and logged the complete I-V curve of the system and a web cam
was used to provide pictures of the actual shading conditions. Measurements
are executed over a period of several months under different shading
conditions varying from virtually unshaded to partially shaded. The
results show a significant increase of output ranging from 2 to even
50 % for the parallel connection.
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