In　view　of　the　problems　of　low　output　voltage　and　large　environmental　impact　in　new　energy　renewable　systems　such　as　photovoltaic　power　generation,this　paper　proposes　a　novel　high-gain　three-port　DC-DC　converter　topology　and　control　strategy.　The　three　ports　of　this　converter　are　connected　to　the　photovoltaic　power　generation　end,the　energy　storage　port　end,and　the　load　end,　respectively.　It　has　advantages　of　low　switch　device　stress,flexible　power　allocation　among　input　sources,and　sirong　excitation　energy　recovery　ability　of　the　coupled　inductor.　The　operating　principles　and　steady-state　conditions　of　the　converter　in　various　operating　modes　are　analyzed　in　detail,and　the　performances　of　the　circuit　topology　are　compared　with　those　of　similar　converters.　According　to　the　control　requirements　of　the　optical　storage　and　power　supply　system　and　the　power　flow　of　the　converter　under　different　working　conditions,the　corresponding　mode　operation　and　switching　control　strategy　are　studied.　A　300　W　prototype　is　built　for　validation,and　the　results　of　the　validation　demonstrate　the　feasibility　of　the　proposed　structure.　©　2024　Science　Press.　All　rights　reserved.