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2. Electrical observation of the hybrid system using photovoltaic and sodium-sulphur battery. Proc JSES/JWEA Joint Conference (2001), No. 4, p 13-16. (in Japanese)
3. Application of SMES to power quality improvement. Proc 13th Annual Conference of Power & Energy Society, IEE Japan, No. 10, p 110-115, 2002. (in Japanese)
4. Output fluctuation reduction of grid connected PV system. Proc 13th Annual Conference of Power & Energy Society, IEE Japan, No. 202, p 617-618, 2002.