Network Code for Connection Points

To overcome technical barriers regarding the new generation of RES inverters, the high penetration of power electronics in the transmission network, and the meshed offshore grids, a roadmap for the connection rules should be established. The solution covers recommendations and methodologies based on the most impacted European connection codes, i. e. the High Voltage Direct Current (HVDC) connection codes, the Demand Connection Code (DCC), and the Requirements for Generation codes (RfG). The improvement of Connection codes is crucial for the successful integration of all the existing assets in Europe in a com-mon unique infrastructure, and also addresses some interoperability issues from a technical perspective (i. e. cross-border trading).

Components & enablers

  • Enabling up to 100% power electronic driven grid
  • High RES integration in the new power systems
  • Harmonisation in common framework for all the power sectors members in EU.

State of the art in application and research

In RESERVE, the regulatory for the transition up to 100% RES is studied. The new generation of converters provide new functions for frequency and voltage control. The new power system with a low level of available inertia requires new connection codes regarding the high penetration of power electronics.

Furthermore, in MIGRATE the concept considered concerns the transmission grid, to which 100% converter-based devices are connected. The goal is a set of requirement guidelines for converter-based generating units, as far as possible at the connection point, which ease the implementation of control and management rules.

PROMOTioN aims to develop testing procedures and guidelines for meshed HVDC offshore transmission networks. To fully exploit the technical work, a Harmonisation Catalogue provides the state-of-the-art regarding the harmonisation of HVDC systems, identifying gaps in this harmonisation, and analysing how findings in the PROMOTioN project can contribute. In addition, deployment is constrained by limitations inherent to the existing European regulations regarding the development of cross-border offshore infrastructures.

Technology Readiness Level


Current focus of R&D and research gaps

To enhance the confidence in the controllability of meshed DC grids as well as their interaction with AC transmission systems and offshore wind farms, a DC network demonstrator embedded in a real-time simulation environment of wind farms and AC grids is set up within PROMOTioN WP 16.

To detail the technical and regulatory barriers concerning the Power Electronics dominated networks, a pilot test with impacts on the present grid codes is realised in MIGRATE, regarding the proper scaling and replication of the grid connection rules and power system control laws. In addition, in the Trial Site Open Day in Ireland, held in the context of the RESERVE project, a major topic investigated is how inverter-based devices can help enable a 100% renewable electricity network.


[1] PROMOTioN [Link 1] [Link 2] [Link 3] [Link 4] [Link 5]

[2] MIGRATE [Link 1] [Link 2] [Link 3]

[3] RESERVE [Link 1] [Link 2] [Link 3] [Link 4]