在主电路拓扑结构的选择过程中，对多电平结构和两电平结构的优缺点分别进行了比较。

While choosing topological structure of primary circuit, merits as well as demerits of multi-level and two-level structure are evaluated.

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多电平换流器是解决这些问题的有效方法，是今后高压大功率系统中换流器选择的主要方案。

Multilevel converter is an effective way to solve these problems above. And it will be the main program in the high-voltage and high-power system.

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