Siemens has secured an order from the transmission grid operator TenneT for grid connection of the 900MW BorWin3 offshore wind farm located in the North Sea.
As per the order, Siemens and its consortium partner Petrofac will deliver the complete high voltage direct current (HVDC) transmission technology for the project, commercial operation of which is scheduled for 2019.
Scope of the supply also includes the complete onshore station, two power transformers at a rating of approximately 670MVA, and the entire air and gas insulated high-voltage switchgear equipment.
While Siemens will be responsible for the overall construction works of the onshore station, Petrofac will take care of the construction and offshore installation of the BorWin3 project's platform.
The HVDC converter modules will be designed, manufactured and tested at Siemen's converter factory located in Nuremberg city.
Supply and installation of the cables for the project had been tendered separately by TenneT and is not part of the consortium's scope of supply.
Siemens Energy Sector Power Transmission Division CEO Karlheinz Springer said the wind project would provide electricity to around one million German households.
"We can now fully apply our broad experience gained in our first four pioneer projects in the North Sea to this project," Springer said.
Siemens said the converter technology that will be implemented in the project is called HVDC Plus, which stands for a voltage-sourced converter designed on the basis of the Modular Multilevel Converter concept.
According to Siemens, the 160km-long grid connection will be used to connect several wind farms to the mainland and the 155kV alternating current supplied by the wind power plants will be transformed into 320kV direct current on the BorWin3 offshore platform.
Once completed, the BorWin3 project will supply electricity through a 130km-long power transmission cable and a further 30km cable on land to the grid feed-in point in Emden.
Image: Siemens and its consortium partner Petrofac will deliver HVDC transmission technology for the BorWin3 offshore wind farm. Photo: courtesy of Siemens.