并联电抗器可以降低线路的稳态电容电流，但对故障暂态电容电流的作用不明显。

Shunt reactors can reduce the steady capacitive current but have unobvious effect on fault transient current.

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通过分析三电平结构的开关暂态过程，建立了变频器暂态开关数学模型，并设计了直流环节部分的限流电抗。

Through the analysis on the turn-on and turn-off transience of NPC three-level MVDs, the corresponding mathematical models are developed, based on which the DC-Link choke value is deduced.

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