一种新的开关拓扑变换方法及新型多电平交-交变流电路

该文提出多电平电路可以通过对基本开关单元的延拓的方法导出，并采用该方法导出了几种新型的多电平交流一交流电流电路，其中包括多电平交流斩波电路和多电平矩阵电路。文中详细分析了3电平交流斩波电路和3电平矩阵电路的工作原理，介绍了3电平矩阵电路所采用的控制方法。与传统电路相比，新的3电平电路可利用的电平数增加1倍，输出电压谐波含量得以减小，并且可以采用较低电压等级的功率器件实现高电压、大功率的交流一交流变换。对这两种电路分别进行了仿真和实验，证实了电路的可行性和该文分析的正确性。

A NOVEL DEDUCTION APPROACH OF SWITCH TOPOLOGIES AND MULTI-LEVEL AC-AC CONVERTERS

It is presented in the paper that multi-level converters can be derived by extension of basic switch elements, and several novel multi-level AC-AC converters are derived with the approach. The operation of 3 level AC chopper and 3 level matrix converters are introduced, the control method applied to 3 level matrix converter is presented. Compared with conventional AC converters, new 3 level converters merit in much lower output harmonic contents by taking the advantage of more available voltage levels, as well as accomplishing high voltage, high power conversion with devices of low voltage. Simulations and experiments were carried out to validate the analysis in the paper.