Power-Hardware-in-the-Loop Emulation of the Low-Frequency Oscillation Phenomenon in AC Railway Networks. - Frutos-Galarza Paul; Juan M. Guerrero; Iker Muniategui-Aspiazu; Iban Vicente-Makazaga; Aitor Endemaño Isasi; David Ortega-Rodriguez; Fernando Briz (IEEE Access, 2022)