The utility model provides a bipolar flexible direct current transmission system and current conversion station thereof relates to the electric power tech field, can restrain the short -circuit current who produces when bipolar flexible direct current transmission system direct current side breaks down. A current conversion station includes positive polarity change of current subtotal negative polarity change of current part for bipolar flexible direct current transmission system, positive polarity change of current part is including first transverter, negative polarity change of current part is including the second transverter, the current conversion station still includes current limiting module, current limiting module includes the reactor, the reactor is established ties on neutral bus.