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Modeling, control, and reduced-order representation of modular multilevel converters

机译：模块化多电平转换器的建模，控制和降序表示

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This paper presents a reduced-order model of the modular multilevel converter (MMC) for electromechanical transient simulations and small-signal analysis. The MMC model is firstly developed in detail; then, simplifications are introduced to reduce it to eleventh- and fourth-order models. The dynamic behaviors of the traditional voltage-source converter and the MMC are also compared. A thorough description of the MMC control system is presented including the inner current control loops, the outer voltage control loops, and the strategy to balance the floating capacitor voltages. Control systems in continuous- and discrete-time domains are given to enable their use in power system simulations and in practical implementations, respectively. Several tests are performed to compare the steady-state and transient response of the detailed and the reduced models. The results show that the fourth-order reduced model can properly capture the input-output dynamics of a complete MMC and significantly reduce the computational cost of large-scale power system simulations with multiple ac/dc converter stations.
机译：本文提出了用于机电瞬态仿真和小信号分析的模块化多电平转换器（MMC）的降阶模型。首先详细开发了MMC模型；然后，引入简化以将其简化为十一阶和四阶模型。还比较了传统电压源转换器和MMC的动态行为。完整介绍了MMC控制系统，包括内部电流控制环路，外部电压控制环路以及平衡浮动电容器电压的策略。给出了连续时间域和离散时间域的控制系统，以使其分别用于电力系统仿真和实际实施中。进行了一些测试，以比较详细模型和简化模型的稳态和瞬态响应。结果表明，四阶简化模型可以正确捕获完整MMC的输入输出动态，并显着降低具有多个AC / DC转换器站的大规模电力系统仿真的计算成本。

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