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中文摘要：
详细分析了模块化多电平换流器（MMC）的典型两阶段启动过程，提出了一种限流电阻的近似计算方法。重点研究了当基于MMC的高压直流输电（MMC—HVDC）系统用于电网黑启动时停电端换流站的黑启动策略，针对两端系统和多端系统，分别提出了相应的启动策略，所提出的策略能保证换流站黑启动的安全、可靠实现，并保证多端系统中剩余端运行不受影响。最后通过PSCAD／EMTDC构建仿真模型，仿真结果验证了所提换流站黑启动策略的有效性。
英文摘要：
A typical two-stage startup process of modular multilevel converter （MMC） is analyzed in detail, and the approximate calculation method of the limiting resistance is proposed. Detailed studies are given on the black-start scheme of the blackout terminal converter when MMC based high-voltage direct-current （HVDC） transmission system is used in grid black start. The corresponding start-up schemes for the two-terminal system and multi-terminal system are proposed. The proposed schemes can guarantee the secure and reliable realization of the converter black start without influencing the operation of other terminals. Finally, simulation models are established in PSCAD/EMTDC, the simulation results validate the efficiency of the proposed black start schemes for the converter of the blackout terminal. This work is supported by National High Technology Research and Development Program of China （863 Program） （No. 2013AA050105）, National Natural Science Foundation of China （No. 51177042）, and National Key Technologies R~D Program （No. 2010BAA01B01）.
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