[1] Shanghai Jiao Tong Univ, Sch Elect Informat & Elect Engn, Shanghai 200240, Peoples R China
[2] East China Elect Power Test & Res Inst, Shanghai 200437, Peoples R China
[3] Dongfang Elect, Yantai 264000, Peoples R China
[4] Yunnan Power Grid Corp, Kunming 650011, Peoples R China
[5] Jiangxi Elect Power Co, Extra highVoltage Sub Co, Nanchang 330072, Peoples R China