The transfer of power from offshore wind farms and other converter-interfaced renewable energy sources (RESs) to remote loads may rely on direct-current (DC) transmission lines. The integration of RESs in the grid via converters and power transfer over DC lines result in the connection of multiple converters to a shared DC point in large-scale power systems. 

The neighbouring converters interact with one another and cause instability and an undesirable transient response in the power grid.

W…