University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Josef Gadermaier
(2012):
AUSWIRKUNGEN VON WOLKEN AUF DEN KURZSCHLUSSSTROM VON AUSGESUCHTEN SOLARZELLEN
Untersuchung der Wirkung von Bewölkungsgrad und Wolkentyp bzw. Wetterlage auf drei verschiedene Solarzellentypen an einem Standort im Alpenraum.
Master / Diploma Thesis - Institut für Meteorologie (BOKU-Met),
BOKU-Universität für Bodenkultur,
pp 87.
UB BOKU
obvsg
- Abstract:
- Electricity production from solar cells is playing a more and more important role in the actual and future energy supply system. For this reason, prediction of output is becoming very essential. The performance of photovoltaic cells is known to fluctuate, and these fluctuations are highly dependent on meteorological conditions at a given site. This thesis focuses on the effect of clouds, as the most important meteorological factor, on three different types of solar cells. The necessary data characterizing the cloudiness was acquired with a full-sky-imager and then related to the data collected from the three different solar cells. The three different cell types used in the study vary in their semi-conductor materials crystalline silica, amorphous silica and cadmium-tellurid. The thesis deals with two ways in which clouds affect solar cells. On the one hand, the cloudiness was calculated from the images which were then compared to the short cut circuit of the solar cells. To quantify the cloudiness from the images, a special software program with color recognition was used. On the other hand, it was possible to define cloud type and weather condition from the images. With this information a comparison was possible between the cloud type or weather conditions and the short cut circuit. The results show a clear relationship between the cloudiness and the short cut circuit. But, there has to be a distinction in situations where the sun is obstructed because this circumstance has a strong impact on the performance of the cells. There are also results concerning the relationship between cloud type/weather condition, and the short cut circuit. Cirrus clouds have, as expected, the lowest effect on the performance of the cells while fog and frontal systems with bad weather show the highest reducing effect. Significant differences between the three cell-types concerning cloud type/weather condition was not observed. Only in the case of partly cloudy conditions was there significant deviation in cell performance. The reason for this seems to be the different spectral response of the investigated solar cells.
- Beurteilende(r): Weihs Philipp