For the new generation of solar cells, like multi-junction GaAs and Si for Low Intensity Low Temperature (LILT) applications, a different solar cell capacitance behaviour is recognised. For large sections, i.e. strings connected in parallel, of these cell types, the time in which the illumination pulse is stable may be too short to measure the large capacitance accurately. It is therefore necessary to increase the pulse duration. Monitoring the step response with a storage oscilloscope requires extra attention as the incorrect time base setting and insufficient sampling rate could result in an overestimation of the capacitance due to aliasing. To cope with these points, an adequate capacitance test set-up and measurement method has been developed. The core of this test set-up is the Vortek Large Area Sun Simulator (VLASS). This solar simulator has the ability to illuminate a solar panel/string continuously, typically 3 to 4 seconds at 1 Solar Constant, and more than 1 minute at low intensities, applicable to deep space missions. Comprehensive knowledge of section capacitance gains importance for many power management systems like Maximum Power Point Trackers (MPPT) and shunt switching regulators.
Solar cell capacitance measurement
Messung der Solarzellen-Kapazität
2002
6 Seiten, 13 Bilder, 4 Tabellen
Aufsatz (Konferenz)
Englisch
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