Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey. - Juan Manuel Carrasco Solís; Leopoldo García Franquelo; Jan T. Bialasiewicz; Eduardo Galvan; Ramón Portillo Guisado; M. Ángeles Martín Prats; Jose Ignacio León Galván; Narciso Moreno-Alfonso (IEEE Trans. Ind. Electron., 2006)