[1] Johannes Kepler Univ Linz, Dept Elect Drives & Power Elect, A-4040 Linz, Austria
[2] Univ Technol Sydney, Sch Elect & Data Engn, Sydney, NSW 2007, Australia
[3] Politecn Torino, Dipartimento Energia, I-10129 Turin, Italy
[4] North China Univ Technol, Beijing 100144, Peoples R China
[5] Univ Southampton, Southampton SO17 1BJ, Hants, England
[6] McGill Univ, Montreal, PQ H3A 0E9, Canada