An Innovative DC-DC Modular Multilevel Converter Topology for Interconnection Asynchronous High Voltage Direct Current Power Grids

Modular Multilevel Converter (MMC) technology provides a practical solution for the interconnections of multi-level power transmission systems with different voltage levels concurrently with recent rapid and successful breakthroughs in the discipline of completely controlled semiconductor technology. Many DC-DC MMC architectures have been presented in the literature, utilizing conventional MMC technology as a reference, depending on these significant developments and its unique properties such as high level of modularity, and scalability. A novel DC-DC MMC design has been presented in the present study. This design’s fundamental objective is to provide an effective method of integrating both currently operating high voltage alternating current (HVAC) power systems with different voltage levels and contemporary high voltage direct current (HVDC) power systems. The integration of two HVAC networks with different levels of voltage via an HVDC transmission system and the proposed DC-DC MMC architecture is examined for the objective of the study that has been presented.