Abstract: When the power reaches a gigawatt scale, the immense volume and weight of offshore wind power transmission platform based on modular multilevel converter (MMC) will greatly increase the construction difficulty and cost of offshore wind power system. Therefore, this paper proposes a kind of DC parallel AC hybrid rectifier valve topology (SDCPAC-HV) based on full-bridge modular multilevel converter (FB-MMC) and 12-pulse diode rectifier unit (DRU). In this topology, MMC controls point of common coupling (PCC) voltage of offshore wind farm, by which DRU transmits part of total power, and each grid-connected wind turbine inverter operates at PQ mode. Firstly, in order to control PCC voltage, the relationship between the proportion of MMC DC voltage to total DC voltage (that is, the proportion of MMC DC voltage) and modulation index is investigated. Then, the balance of MMC reactive power, DRU reactive power and wind farm reactive power is analyzed. Meanwhile, the control strategies of MMC at normal conditon and of DC bus short circuit fault and PCC bus short circuit fault recovery are given. Finally, a complete electromagnetic simulation model of offshore wind power system is built by PSCAD/EMTDC to verify the correctness of the proposed topology and its control strategy.