In　recent　years,　with　the　rapid　development　of　the　national　economy,　the　national　electricity　consumption　has　increased　significantly.　Under　the　scenario　of　island　power　supply,　the　contradiction　of　insufficient　transmission　capacity　is　particularly　prominent.　Therefore,　it　is　necessary　to　increase　the　transmission　capacity　of　the　existing　lines　or　to　build　new　transmission　lines.　As　a　new　type　of　transmission　technology,　low-frequency　transmission　technology　has　the　advantages　of　relatively　increased　transmission　capacity,　no　circuit　breaker　technology　bottleneck,　and　the　energy　release　rate　of　low-frequency　AC　(LFAC)　system　is　significantly　lower　than　that　of　DC　system.　Therefore,　LFAC　transmission　technology　is　a　very　competitive　transmission　technology　in　island　power　supply　scenario.　This　paper　analyzes　the　advantages　and　disadvantages　of　various　transmission　technologies,　studies　the　control　strategy　of　AC-AC　converter　and　the　coordinated　control　strategy　of　multi-terminal　LFAC　power　grid.　The　master-slave　control　strategy　of　multi-terminal　LFAC　transmission　system　is　proposed.　The　simulation　model　of　four　-terminal　LFAC　transmission　system　is　established　in　PSCAD　/　EMTDC.　Through　the　simulation　analysis　of　the　proposed　control　strategy,　the　feasibility　and　effectiveness　of　the　control　strategy　are　verified.　©　2020　IEEE.