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中文摘要：
基于模块化多电平换流器（MMC）的稳态数学模型，建立了MMC离散化数学模型，并基于模型设计了MMc电流内环离散控制器。针对MMc直流输电故障时系统中存在的负序电流，提出了基于MMC欧拉-拉格朗日模型的正负序无源控制器。为保证故障时系统仍能安全传输指定的有功功率，采用了故障时的有功功率控制策略。最后，在PSCAD／EMTDC环境下搭建了21电平模块化多电平换流器型高压直流（MMC—HVDC）输电系统仿真模型。仿真结果表明，所述控制策略在稳态和暂态过程中具有良好的控制效果，且结构简单，对实际工程具有一定的参考价值。
英文摘要：
According to the steady state mathematical model of modular multilevel converter （MMC）, a discrete mathematical model of MMC is developed. Based on which, a discrete inner-loop current controller of MMC is designed. The positive- negative sequence passive controller based on an Euler-Lagrange mathematical model of MMC is proposed to suppress negative sequence current due to DC transmission system faults. In order to maintain certain active power delivery, the active power control strategy under fault condition is adopted. Finally, a 21-level system simulation model of MMC high voltage direct current （MMC-HVDC）transmission system is built in PSCAD/EMTDC. The results show that the proposed control method has a good control effect on the transient and steady state process and can provide reference to actual projects for its simple structure.
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