DolWin1

Setting a new record with VSC at +/-320 kV and minimizing environmental impact.

The German company TenneT Offshore GmbH, formerly transpower stromübertragungs gmbh, awarded ABB a contract to supply an 800 MW HVDC Light transmission system to connect offshore wind farms located in the North Sea DolWin1 cluster (the 400 MW Borkum West II wind farm and future unnamed wind farms) to the German national grid. 

The wind farms will be connected with AC cables to an HVDC Light converter station installed on an offshore platform in the North Sea. The turbine-generated power will be 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 the latest generation of ABB power semiconductors and increased performance that ensures high availability and lower system losses. 

ABB is 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 will be laid underground, minimizing environmental impact.

Main data

Commissioning year: 2014
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 Light: Length of land and sea cables
Application: Offshore wind connections

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