Decoupled Control Strategy of a Hexverter Operating in Low-Frequency Ac Transmission Systems

Low Frequency AC Transmission Systems have been reported as an appropriate alternative for transmitting energy over medium distances due to their cost-effectiveness compared to HVAC and HVDC systems. These transmission systems allow for the connection of two different grids. The Modular Multilevel Cascade Converter (MMCC) is presented as a promising solution for this purpose due to its scalability, modularity, and control flexibility. Among the MMCC family, there is a topology that has not been fully studied: the Hexverter, which allows for grid connection with fewer semiconductor devices than other topologies. Therefore, this paper presents a study of the Hexverter and a decoupled control scheme. Simulations and results are analyzed to demonstrate the effectiveness of the proposed strategy. © 2024 IEEE.