1. Engineering Department; Federal University of Lavras; Lavras Minas Gerais Brazil
2. Federal University of Rio de Janeiro, COPPE/Poli; Rio de Janeiro RJ Brazil
3. Department of Electrical Circuits; Federal University of Juiz de Fora, Campus Universitário; Juiz de Fora MG Brazil
4. Department of Engineering Sciences and Mathematics, Energy Science Division; Luleȧ University of Technology; Luleȧ Sweden
5. Department of Electrical Engineering; Federal University of Itajubá; Itajubá MG Brazil