The Combined Grid Solution is a hybrid system. On the one hand, it serves as the grid connection for the offshore wind farms, on the other hand it connects the transmission grids of Denmark and Germany and, thus, allows for the transnational exchange of electricity. In case of strong wind, the full capacity of submarine cables can be used to feed the wind power generated offshore into two grids via one single system. If there is relatively little wind on the Baltic Sea, however, the remaining capacity can still be used for the exchange of electricity between the two countries. Consequently, the platform and submarine cables are optimally used, regardless of the wind on the high seas. This system does not yet exist anywhere else in the world.
In order to control this complex system, a newly developed Master Controller for Interconnector Operation (MIO) with the latest information technology has been installed in the Transmission Control Centre in Berlin/Neuenhagen.
The Master Controller acts as the ‘brain’ of the entire system. It calculates the available capacity of the interconnector (wind forecasts), prevents overload by controlling the converter and/or the wind farm, maximises the feed-in from the wind farms through active system control (936 MW are possible), controls the exchange of electricity between the grids of both countries by means of the converter. In this way, the infrastructure of the wind farm connections and the interconnector, mainly submarine cables, can be utilised to 100 per cent which also lowers the prices for the consumer.