Modular Power Electronic Transformers: Modular Multilevel Converter Versus Cascaded H-Bridge Solutions

This article analyzes two modular power converter concepts, cascaded H-bridges (CHB) and modular multilevel converter (MMC) topologies, with special attention to the latter design. Both concepts have some characteristics in common and can provide the required functionalities for power electronic transformers (PETs). This analysis will cover aspects like the number of required cells, characteristics of the power devices, functionalities, and potential uses.