A consortium comprising Siemens Energy and Prysmian Powerlink has received an order worth more than €500m from German transmission grid company transpower to connect offshore wind farms through a high-voltage direct current (HVDC) converter.
The BorWin2 offshore consortium will connect two North Sea offshore wind farms to the grid on behalf of transpower, a subsidiary of the Dutch grid operator TenneT.
The design and engineering phase for the consortium is due to be complete by mid-2011 and the onshore substation will be built in 2011, with installation of the offshore platform planned for mid-2012, Siemens said.
With cable-laying scheduled for completion in 2012, the whole transmission link is expected to begin operation in 2013.
The Veja Mate and Global Tech 1 offshore wind farms, which will have a combined power generating capacity of up to 800MW, will be connected to the grid via a submarine cable link carrying HVDC.
‘The BorWin 2 turnkey offshore grid connection is a challenging project where we can apply our broad-based experience and know-how in this field,’ said Dr Udo Niehage, CEO of the Power Transmission Division of Siemens Energy.
The Veja Mate and Global Tech 1 wind farms are located approximately 125km offshore northwest of the island of Borkum.
Siemens will supply the world’s largest voltage sourced converter system using Siemens HVDC Plus technology, which will be installed on an offshore platform where the voltage level will be stepped up from 155kV to 300kV alternating current (AC) and then converted to direct current (DC) at the same voltage level.
The platform will accommodate all the requisite electrical equipment for the converter such as two transformers, four AC cable compensation reactors and high-voltage gas-insulated switchgear.
The Siemens Wind Power Offshore Substation will be designed as a floating, self-lifting platform that will be towed by tugs to its destination at sea, where the water is about 40 metres deep.
The power will be transported via submarine and land cable to Diele near Papenburg, where an onshore substation will reconvert it from DC to AC for further transmission and distribution within the 400kV AC grid, said Siemens.
In fiscal 2009, Siemens’ Energy Sector had revenues of approximately €25.8bn, profits of €3.3bn and received new orders totaling approximately €30bn.
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Tags: offshore wind
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