1. Centro Federal de Educação Tecnológica de Minas Gerais,Grad. Program in Electrical Engineering,Belo Horizonte,Brazil
2. Universidade Federal de Minas Gerais,Grad. Program in Electrical Engineering,Belo Horizonte,Brazil
3. Universidade Federal de Viçosa,Dept. of Electrical Engineering,Viçosa,Brazil
4. Tianjin University,Dept. of Electrical Engineering,Tianjin,China
5. Universidade Federal de Juiz de Fora,Dept. of Electrical Energy,Juiz de Fora,Brazil