Abstract: The worldwide energy transition demands integrating a growing amount of renewable power sources into the power grids, electrification road traffic and electrification of heat generation. Most of the sources and loads to be integrated operate on DC: large PV systems, communal battery storage systems, charging stations for cars and trucks, electrolysis, fuel cells, centralized heat pumps and power supply of buildings. Interconnecting everything over individual AC/DC converters is both inefficient and overloads power grids. Connecting DC-systems over DC.-grids and the DC-grid over one interlink converter to the AC grid represents the more effective and more efficient solution: it avoids unnecessary power conversions and reduces the capacity of the grid connection. While DC-grids at low voltage level are well on the way in standardisation, interconnecting systems over a diameter of 10 km with a power of 10 MW will demand a medium voltage DC-grid (MVDC grid) of about 10 kV (respectively ±5 kV). Generating a market for compatible DC-systems on such a grid demands the definition of a grid code: Devices need to comply to this grid code in order to be compatible with each other. The webinar illustrates the use case, presents requirements on a grid code for MVDC grids, and concludes with the current state of standardization.
