The performance of a method to forecast PV power one dayahead of time was presented and the expected error per forecastedvalue in each season in Hokkaido was characterized. In the regionthe forecast method had 80% better skill than persistence, but largeerrors, although infrequent, were as high as 50% of the peak poweroutput. Spring had the highest average and large errors. Previouslywe analysed the characteristics of the forecast errors of Kyushu.In following studies, a comparison between different regions ofJapan will be done and the results will be used in the developmentof operation planning method.
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