[Huang, Jingjie;Meng, Ke] Univ Sydney, Sch Elect & Informat Engn, Sydney, NSW 2006, Australia.^[Lai, Mingyong;Zhou, Renjun] Changsha Univ Sci & Technol, Sch Elect & Informat Engn, Changsha, Hunan, Peoples R China.^[Zheng, Yu;Ma, Xiyuan] China Southern Power Grid Co, Elect Power Res Inst, Guangzhou, Guangdong, Peoples R China.