With　the　development　of　intelligent　distribution　networks　and　the　increasing　demand　for　new　energy　access,　solid　state　transformers　(SSTs)　have　become　a　key　link　in　modern　energy　transformation　systems.　In　order　to　realize　the　functions　of　electrical　transformation　and　electrical　isolation　of　three-phase　AC-single-phase　communication,　this　paper　proposes　a　structure　of　SST　from　three-phase　alternating　current　to　single-phase　alternating　current　based　on　three-phase　uncontrolled　rectification,　isolated　DC/DC　converter　and　single-phase　inverter,　and　analyzes　it　in　detail.　The　proposed　SST　can　not　only　realize　voltage　transformation　from　three-phase　AC　to　single-phase　AC,　but　also　have　voltage　regulation　and　fault　isolation　functions.　Finally,　based　on　the　MATLAB/Simulink　simulation　platform,　the　proposed　five-stage　SST　topology　is　built　and　verified　by　simulation.　The　structure　of　SST　not　only　has　the　functions　of　voltage　transformation　and　electrical　isolation,　but　also　has　fault　isolation,　reactive　power　compensation,　power　flow　control　and　other　functions.