Four-Port, Single-Stage, Multidirectional AC-AC Converter for Solid-State Transformer Applications. - Cicero Alisson dos Santos; Luan Carlos dos Santos Mazza; Fernando Lessa Tofoli; Demercil de Souza Oliveira Junior; Paulo Peixoto Praça; Fernando Luiz Marcelo Antunes (IEEE Trans. Ind. Electron., 2022)