Survey on Modular Multilevel Converter: definition, principal of operation, classification, challenges and applications

Modular Multilevel Converter (MMC) is an electronic device that has wide use in the power field according to its ability to work in a bidirectional way. This survey is an explanation of the main features of MMC which generate the idea of using MMC as what is Modular Multilevel Converter, how it works, types of MMC, applications, advances, and issues.