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Integrates 800 megawatts (MW) of clean energy into the German transmission grid

The DolWin1 offshore wind HVDC link was supplied by ABB to the German company TenneT, The 800 MW HVDC Light® transmission system connects offshore wind farms located in the North Sea DolWin1 cluster to the German national grid. 

The wind farms is connected with AC cables to an HVDC Light® converter station installed on an offshore platform in the North Sea. The turbine-generated power is transformed here and transmitted via a 75-km long DC undersea cable, then a further 90-km long land cable to an onshore HVDC converter station at the grid connection point of Dörpen West/Heede.

The HVDC Light® system has a total capacity of 800 MW at ±320 kV, and provides numerous other environmental benefits, such as neutral electromagnetic fields, oil-free cables and compact converter stations, making it an ideal for connecting remote wind farms to mainland networks without distance limitations or constraints on the grid. The system features ABB power semiconductors that ensures high availability and minimize system losses. 

ABB was responsible for system engineering including design, supply and installation of the offshore converter including the platform, sea and land cable systems and the onshore converter station. Land cables has been laid underground, minimizing environmental impact.

Main data

Commissioning year: 2015
Power rating: 800 MW
No of circuits: 1
AC voltage: 155 kV (Platform DolWin Alpha),
380 kV (Dörpen/West)
DC voltage: ±320 kV
Length of DC submarine cable: 2 x 75 km
Length of DC underground cable: 2 x 90 km
Main reason for choosing HVDC: Length of land and sea cables
Application: Offshore wind connections
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