On the choice of the right HVDC Electrode type

In the preliminary design of a HVDC link one of the most peculiar and complex phases is the correct choice and configuration of main return electrodes. The choice may be strongly dependent on a large number of technical, local and environmental constraints; therefore, there may be situations leading to an obvious choice, and other where the designer has significantly larger freedom of choice. To clarify the subject, this paper gives an overview of the main arising issues and of the procedures that can be followed.