[1] PSI NEPLAN AG, CH-8700 Kusnacht, Switzerland
[2] Univ Austral Chile, Fac Ciencias Ingn, Valdivia 5111187, Chile
[3] Ecole Polytech Fed Lausanne, Distributed Elect Syst Lab, CH-1015 Lausanne, Switzerland
[4] Southeast Univ, Sch Elect Engn, Nanjing 210096, Peoples R China
[5] Christian Albrechts Univ Kiel, Chair Power Elect, D-24143 Kiel, Germany