In　order　to　maintain　different　voltage　levels　between　the　front　and　rear　dc　terminal　bus　derived　from　new　energy　industry,　a　novel　bidirectional　wider　range　of　boost-buck　three-level　LCC　resonant　converter　as　an　energy　link　is　proposed　by　combining　the　LCC　resonant　tank　module　with　a　particular　three-level　coupling　cascaded　neutral　point　clamping　active　bridges,　which　is　composed　of　two　three-level　neutral　point　clamping　bridge　arms.　Furthermore,　the　converter　can,　respectively,　establish　forward　LCC　and　backward　SRC　working　modes　to　maintain　unified　wider　bidirectional　voltage　gain　range　between　the　input　and　output　by　asymmetric　structure　of　LCC　resonant　tank　module　that　boost-voltage　is　enabled　by　equivalent　principle　of　conventional　LCC　resonant　converter　and　buck-voltage　is　enabled　by　equivalent　principle　of　conventional　series　resonant　converter,　while,　a　unified　bidirectional　boost-buck　voltage　gain　matching　control　strategy　is　designed　with　an　optimization　about　parameters　of　LCC　resonant　tank　module　under　realizing　of　zero　voltage　switching-on　and　reducing　of　reactive　power　losses.　Finally,　according　to　the　simulation　platform　and　experimental　prototype,　it　can　be　shown　that　the　practical　voltage　gain　is　closed　to　the　theoretical　designed　gain　and　converter　has　good　dynamic　performances　after　realizing　of　soft-switching　in　each　mode.