José Maria Carvalho Filho received the M.Sc. and D.Sc. degrees in electrical engineering from the Itajubá Federal University, Itajubá, Brazil, in 1996 and 2000, respectively. Currently, he is Associate Professor with Itajuba Federal University and a Power Quality Study Group Member. His fields of interest include voltage sags and other power-quality issues. He is also a Specialized Consultant in industrial planning.