1. School of Electrical Engineering, Pontificia Universidad Católica de ValparaÃso, Valparaíso, Chile
2. School of Electrical Engineering, Shenyang University of Technology, Shenyang, China
3. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
4. Department of Electrical and Computer Engineering, University of Michigan-Dearborn, Dearborn, MI, USA
5. Departamento de Ingeniería Eléctrica, Universidad Técnica Federico Santa María, Valparaíso, Chile