Fractional　frequency　transmission　system　(FFTS),　which　is　also　known　as　low　frequency　AC　transmission　(LFAC),　is　a　very　promising　transmission　scheme　for　offshore　wind　farm　integration.　This　paper　proposed　a　droop-based　control　method　for　communication-free　coordination　of　converters　in　FFTS.　Firstly,　the　concept　and　topology　of　Multi-terminal　FFTS　(MT-FFTS)　for　offshore　wind　farm　integration　is　introduced.　Secondly,　the　droop　control　of　converters　in　MT-FFTS　is　designed.　Finally,　the　droop　control　is　implemented　in　a　MT-FFTS　case　study　in　MATLAB/Simulink　and　the　results　shows　that　the　proposed　droop　control　is　correct　and　effective.　©　2019　IEEE.