[1] Nisantasi Univ, Fac Engn & Architecture, Dept Elect & Elect Engn, TR-34481742 Istanbul, Turkey
[2] Univ Pitesti, Fac Elect Commun & Comp, Pitesti 110040, Romania
[3] Univ Politehn Bucuresti, Doctoral Sch, 313 Splaiul Independentei, Bucharest 060042, Romania
[4] Natl Res & Dev Inst Cryogen & Isotop Technol, ICSI Energy Dept, Ramnicu Valcea 240050, Romania
[5] King Mongkuts Univ Technol North Bangkok, Fac Tech Educ, ICSI Renewable Energy Res Ctr RERC, Bangkok 10800, Thailand
[6] Univ Lorraine GREEN, Grp Res Elect Engn Nancy GREEN, F-54000 Nancy, France