[1] Shanghai Dianji Univ, Coll Elect Engn, Shanghai 201306, Peoples R China
[2] Zhejiang Univ, Coll Elect Engn, Hangzhou 310027, Peoples R China
[3] Tsinghua Univ, Dept Elect Engn, State Key Lab Power Syst, Beijing 100084, Peoples R China
[4] Univ San Sebastian Santiago, Fac Engn, Santiago 8420524, Chile