This paper presents a novel small-signal model of modular multilevel converter (MMC) based on harmonic state space (HSS). With this model, the impedance of MMC can be easily obtained. What's more, the accuracy and complexity can be balanced well. In the end, the simulation and analytical results are compared to verify the feasibility of the proposed small-signal model of MMC.
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Chen et al. (2016) studied this question.
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