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With the development of offshore wind power generation, large-capacity medium-voltage wind turbine becomes the development trend. In this paper, the cascaded multi-cell topology with four-quadrant operation capacity is applied to medium-voltage wind power converters, which consist of a large number of switching devices, so it is essential to improve the converter's fault-tolerant ability. Once the...
DC wind farm (DCWF) with series-connected DC wind turbines (DCWTs) is proved to be a potential solution of offshore wind power collection. The coupling behaviour of series-connected DCWTs is described in detail. Possible wind energy curtailment during the period of wind turbine voltage limitation and its key impact factors are firstly quantitatively derived. A novel variable speed control strategy...
In this paper the modular multilevel converter (MMC) is proposed as the wind power converter for offshore dc grids. MMC has been widely used for high-power high-voltage applications, and it is able to connect a low ac voltage source to a high dc voltage source, which makes it a promising solution for wind power converter in offshore wind farm dc grids. This paper presents the analysis and design of...
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