1. Laboratory of Power and Control Systems Facultad de Ingeniería, Universidad Nacional de Asunción, Luque, Paraguay
2. Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”, University of Bologna, Bologna, Italy
3. CISE - Electromechatronic Systems Research Centre, University of Beira Interior Calçada Fonte do Lameiro, Covilhã, Portugal