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With the development of the offshore wind farms, DC offshore wind farm topology is getting more attention due to its low loss and light weight, where the DC/DC converters with high voltage gain are key equipments. This paper studies the Input-Parallel-Output-Series(IPOS) converter based on Dual-Active-Bridge(DAB) topology, discusses the modulation and control method of the converter, and proposes a fault ride-through scheme. Simulation results validate the proposed topologies and control schemes.