多变换器模块化串并联组合系统

Modularization Structure for Series-Parallel Connected Converters

多变换器串并联组合系统在很多场合都有广阔的应用前景。以输入并联输出并联组合系统为基础,提出适合其他三种组合(输入并联输出串联、输入串联输出并联以及输入串联输出串联)的多变换器模块化串并联组合系统。其特点是不但单个变换器模块可以正常独立工作,而且还可以将多个变换器模块仅通过母线联接的方式进行串并联组合,不需要外加任何电路,就可以组成新的变换器系统,真正实现组合系统的模块化结构。同时,针对多变换器串并联组合系统中模块可能出现故障的问题,进一步提出了具有容错功能的模块化结构,即当某个模块出现故障时,系统仍然能够维持正常工作。仿真和实验结果验证了该结构的有效性。

Power systems constructed from connecting multiple converter modules in series and/or parallel at both the input and output sides will be broadly applied for their remarkable advantage Based on the input-parallel output-parallel （IPOP） structure, three modularization structures are proposed for input-parallel output-series （IPOS）, input-series output-parallel （ISOP）, input-series output-series （ISOS）, respectively, in this paper. These proposed structures have the following features： a） basic converter in the connected system can operate in standalone mode; b） no extra controller is needed to regulate the input/output current/voltage distribution. Furthermore, the fault-tolerant function is also included in the proposed structures preventing from one module malfunction. The computer simulation and experimental results are presented to verify the effectiveness of the proposed structures.