High voltage direct current (HVDC) transmission lines are being constructed throughout the world

aided by advancements in power electronics and the potential value to transfer power between distant areas and off-shore locations. Multiple HVDC lines within and across large AC interconnections could bring about economic benefits such as interregional capacity exchange and transfer of low-cost

distant electric energy directly to load centers. In addition

network configuration of HVDC lines could result in additional benefits that have not been deeply studied. This paper describes the modeling process for continentallevel power system interconnections with the addition of multiple HVDC lines configured as a macrogrid. The models used for study are based on industry-accepted power-flow and dynamic system models for the North American Eastern and Western Interconnections. The model provides insight on feasibility and initial steady-state and stability tests of the HVDC macrogrid and its interactions with the existing electricity infrastructure

opening the door to analysis of the technical value of such a macrogrid.