Power characteristics of PV ensembles: experiences from the combined power production of 100 grid connected PV systems distributed over the area of Germany

Monitored data from 100 PV systems were used to study effects of combined power generation of these systems, compared to the characteristics of an individual system. The standard deviation curve of an average daily power generation profile of 1 month is significantly decreased for the ensemble and c...

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Bibliographic Details
Published in:Solar energy 2001, Vol.70 (6), p.513-518
Main Authors: Wiemken, E., Beyer, H.G., Heydenreich, W., Kiefer, K.
Format: Article
Language:English
Subjects:
Energy efficiency
Photovoltaic cells
Power supply
Solar energy
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Summary:Monitored data from 100 PV systems were used to study effects of combined power generation of these systems, compared to the characteristics of an individual system. The standard deviation curve of an average daily power generation profile of 1 month is significantly decreased for the ensemble and corresponds to predictions based on cross-correlation characteristics of the radiation field. Power fluctuations between the monitored time intervals of more than 5% of the installed power have disappeared. The analysed energy spectrum of the combined power generation reveals that the produced energy is generated in a range below 65% of the overall installed power. The ensemble of PV systems supplies a calculable fraction of PV power within a certain time window around noon in the summer period, underlining the capability of reliable power production of a PV ensemble.
ISSN:0038-092X
1471-1257
DOI:10.1016/S0038-092X(00)00146-8