Abstract
This paper describes smoothing effect and fluctuation of PV generation for the voltage management in distribution system. The purpose of the analysis is to show quantitatively the fluctuation and the smoothing effect of PV generation by weather, using actual generation data from 25 distributed PVs in the distribution area. The analysis showed the impact of PV output fluctuation by weather based on the indexes of the coherence and the maximum fluctuation. In particular, it showed the relationship between area largeness and PV output fluctuation by frequency. It was found that both of the two indexes were different by weather, and fine and cloudy day seemed to be the most difficult situation for the voltage management in distribution system.
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