I want to express my acknowledgements to: My supervisor Prof. Walmir de Freitas Filho for his guidance and the opportunity to conduct my M.Sc. and Ph.D. research in the LE-41 laboratory. Prof. Walmir has help me grow as a professional with his vast knowledge and insights on the application of electrical engineering. He inspired me to be more pragmatic and always keep updated. Dr. Ricardo Torquato Borges for his friendship, patience and detailed guidance during the development of our work together and teaching me how to properly structure, execute and report technical research projects. Ricardo is an excellent person and professional with a bright future, as well as an example of hard work. My colleagues from the LE-41 laboratory for their valuable insight and recommendations for improvement. They welcomed me since day 1 with open arms being a foreigner. To my family for their love, support and patience. My mother Salomé Guillén Espinoza who taught me to always aim for my best, my father Léxter Argüello Zamora for introducing me into the world of electricity, my brother Emilio Argüello Guillén for making me want to constantly improve so I can be a good role model for him. To my dear wife Bruna Ribeiro Braga who stands by my side in all of our adventures, and for showing me that life should be lived in balance.