Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 七原 俊也,Power variation of wind power generation and its effect on the electric power system,Journal of Japan Wind Energy Association,03876217,Japan Wind Energy Association,2005,29,4,76-82,https://cir.nii.ac.jp/crid/1390282679622941056,https://doi.org/10.11333/jwea1977.29.4_76