1. Engineering R&D Center; The Kansai Electric Power Co. Inc., 3-11-20, Nakoji; Hyogo Amagasaki-shi, 661-0974 Japan
2. Power System Control Group, Power System Engineering and Operation Department; The Kansai Electric Power Co. Inc., 3-6-16, Nakanoshima; Kita-ku Osaka, 530-8270 Japan
3. Meteorological Engineering Center, Inc., 8-5-1, Hori, Kyo-machi, Nishi-ku; Osaka-shi Osaka, 550-0003 Japan