1. Departament of Electrical Energy Systems, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia
2. Postgraduate Program in Systems Engineering, Polytechnic School of Pernambuco, University of Pernambuco, Recife 50720-001, PE, Brazil
3. Polytechnic School of Pernambuco, Recife 50720-001, PE, Brazil