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中文摘要：
柔性直流输电并网方式对于大容量远距离海上风电场是一种较好的并网方案。针对模块化多电平直流输电（modular multilevel converter-HVDC,MMC-HVDC）应用于大规模风电场联网问题,分析研究了相应的MMC-HVDC稳态控制策略,仿真验证了其可行性。为保证当联网系统与交流系统的并网点发生不对称故障时风电场可以不脱网持续运行,设计了MMC-HVDC不对称故障期间的控制器,以将风电场与故障隔离并尽可能将功率传送至交流系统中,提高了风电场的低电压穿越能力,并在PSCAD/EMTDC中搭建的仿真模型上验证了此方法的可行性及有效性。
英文摘要：
It is a better scheme for grid-connection of large-capacity long-distance offshore wind farms via HVDC flexible.Aiming at the problem of applying modular multilevel converter-based HVDC（MMC-HVDC） to grid-connection of large-scale offshore wind farms,corresponding steady-state control strategy for MMC-HVDC is analyzed and researched,and the feasibility of such a scheme is verified by simulation.To ensure that when unsymmetrical fault occurred at the grid-connection point,where the grid-connection system is connected to AC power grid,the not-off-grid operation of wind farm can be sustained,a controller for MMC-HVDC during unsymmetrical fault is designed to isolate the wind farm from the fault and transmit power to AC grid as possible to improve the low voltage ride-through capability of the wind farm.The feasibility and effectiveness of the proposed method are verified by the simulation carried out in PSCAD/EMTDC.
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