[1] Univ Tun Hussein Onn Malaysia UTHM, Dept Power Elect Engn, Parit Raja, Johor, Malaysia
[2] Univ Pretoria, Dept Elect Elect & Comp Engn, ZA-0028 Pretoria, South Africa
[3] Univ Sydney, Sch Elect & Informat Engn, Sydney, NSW 2006, Australia
[4] Univ Teknol Malaysia, Dept Power Elect Engn, Johor Baharu, Malaysia