An electric power transmission system and method that provides a power electronic interface system for connecting a plurality of alternating current transmission lines by one or more direct current transmission lines. The system includes dc-link converters, frequency transformers connected to the converters, and multilevel converters are connected to a direct current transmission line.
US 20150155716 A1
Board of Trustees of the University of Arkansas (Little Rock, AR)
Balda, Juan Carlos and Escobar-Mejía, Andrés, "AC line connector with intermediate DC link" (2017). Patents Granted. 319.