To analyze the harmonic performance of the MIDC system accurately, a suitable steady model should be established.

要准确地对多馈入直流系统的谐波特性进行分析，需要建立一个准确完善的稳态模型。

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Then the developing trend of MIDC system in the South China Interconnected Power Grid and East China Power Grid is discussed.

以西电东送受端的南方电网和华东电网为例，分析了MIDC系统在我国的发展趋势。

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