[Fang, Lu; Luo, An; Wang, Wen; Li, Zhou] Hunan Univ, Coll Elect & Informat Engn, Changsha 410082, Hunan, Peoples R China.
[Xu, Xianyong] Hunan Elect Power Co, Res Inst, Changsha 410082, Hunan, Peoples R China.
[Thuyen Minh Chau] Ind Univ Ho Chi Minh City, Fac Elect Engn, Ho Chi Minh City, Vietnam.
[Wang, Wen] Changsha Univ Sci & Technol, Coll Elect & Informat Engn, Changsha 410004, Hunan, Peoples R China.