The European energy sector is currently experiencing a major transition towards a carbon neutrality in order to reach “European Green Deal’s” objectives. One of the means to achieve this is the large integration of offshore RES which mainly relays on the deployment of offshore wind and HVDC interconnectors. To support the interoperability for a secure operation of the future European energy system and the realisation of interaction studies for multi-vendor AC and multi-vendor multi-terminal DC systems, ENTSO-E proposes a standardised control interface for HVDC.