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中文摘要：
为了弥补原有AVM在仿真直流故障及换流器闭锁等方面精度不足的问题,研究了模块化多电平换流器（MMC）的平均值模型（AVM）,在电压源换流器高压直流输电（VSC-HVDC）电网中的适用性.本文从MMC换流器拓扑的角度出发,提出了改进的AVM,采用MMC的电磁暂态（EMT）详细模型搭建的4端MMC型直流网络为基准,对比发现AVM有效的前提是MMC精确模型中的电容值足够大,以使得MMC中每个子模块（SM）的电容电压近似恒定.仿真证明：本文所提改进平均值模型能够精确仿真直流故障时换流器闭锁等工况,对MMC建模有着重要的工程指导意义.
英文摘要：
This paper investigates the applicability of averaged value models（ AVMs） for modular multilevel converters（ MMCs） operating in a voltage-sourced converter-based-high-voltage DC（ VSC-HVDC） grid. The AVMs are benchmarked by comparison with a detailed electromagnetic transient（ EMT） model of the grid,including a fully detailed MMC model. Analysis results show that the AVM is only effective as long as the capacitors are large enough to maintain nearly constant voltage across each MMC sub-module（ SM）. This paper also shows that previously developed MMC averaged models are not able to accurately simulate the transients under DC fault conditions. This paper introduces topology changes to a previously proposed averaged model that results in much improved simulation for such conditions. This paper also shows that the model can be used effectively to study HVDC grids with significant time savings.
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