Abstract
This paper presents the control strategy of a dc series offshore wind farm with an onshore modular multilevel converter (MMC). The series connection of the dc wind turbines establishes the HVDC transmission voltage level with neither offshore transformer nor centralized converter station, indicating huge savings on offshore wind farm investment. However, power production unbalance in the wind farm or bypass of any wind turbine may impose overvoltage at the outputs of several wind turbines. A global control strategy, which regulates the HVDC voltage level by controlling the onshore MMC, is thus proposed to ensure the operation of each wind turbine under a safe voltage level while no power production is lost in the wind farm. This paper first introduces the whole wind generation system. Then the steady state analysis of the dc series offshore wind farm and the overvoltage phenomenon are described, which lead to the proposal of the global control strategy. The detailed realization of the global control strategy by use of the MMC is given after a short recall of the MMC arm average model.
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