Impact of present and future HVDC links on the Nordic power grid

This article presents preliminary results from ongoing work on establishing a simulation model for R&D activities on the impact of the increasing number of HVDC links in the Nordic power grid. The total HVDC power capacity will be 13100 MW (excluding some smaller systems) by 2021. This study addresses a future scenario with additional 7400 MW of HVDC interconnection capacity for power exchange. The scenario is analysed numerically using the simulation tool "DIgSILENT PowerFactory", considering an aggregated representation of the future power grid. The preliminary power flow results indicate that capacity and voltage constraints within the Nordic power grid will be a limiting factor for the power exchange. The first dynamic results indicate that future high import scenarios can give more oscillations after disturbances compared to scenarios with less import, considering generic converter controllers that are not tuned to damp these oscillations.