The control strategy and topology of multilevel inverters, as well as the work principle of three-level inverter, are firstly analyzed.
阐述了多电平逆变器的控制策略和拓扑结构，并具体分析了三电平逆变器的工作原理。
Secondly, it researches three kinds of basic topology structure of three-level inverter and discusses working principle and the advantages and disadvantages of all kinds of structure.
其次研究了三电平逆变器的三种基本拓扑结构，对各种结构的工作原理和优缺点进行了阐述。
The direct type single-phase 5-level and three-phase 5-level current source inverter topology can be developed to 7-level and higher level.
对单相直接式5电平和三相直接式5电平拓扑进行拓展，拓展到7电平以及更到的电平。
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