DolWin2

This HVDC Light transmission project is the third offshore wind connection to be delivered by ABB, and will help avoid more than three million tons of carbon dioxide emissions per year by replacing fossil-fuel based generation.

The German company TenneT Offshore GmbH awarded ABB a contract to supply a 900 MW HVDC Light transmission link to connect offshore wind farms located in the North Sea DolWin cluster (the 400 MW Gode Wind II wind farm and other wind farms) to the German national grid.

The wind farms will be connected with AC cables to an HVDC converter station installed on an offshore platform in the North Sea. The power they generate will be transmitted through a 45-km long DC sea cable and a further 90-km long land cable to an HVDC onshore station at the grid connection point of Dörpen-West.

The transmission system has a total capacity of 900 MW at ±320 kV, which makes it presently the world's largest offshore HVDC system. The HVDC Light system used provides numerous environmental benefits, such as electrical losses of less than 1 percent per converter station, neutral electromagnetic fields, and compact converter stations. HVDC Light technology is ideal for connecting remote wind farms to mainland networks without distance limitations or constraints on the grid.

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, thus minimizing environmental impact.

Main data

Commissioning year: 2015
Power rating: 900 MW
No of circuits: 1
AC Voltage: 155 kV (Platform DolWin beta),
380 kV (Dörpen-West)
DC Voltage: ±320 kV
Length of DC submarine cable: 2 x 45 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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