A bouquet from Siemens

Friday, 13 March, 2015 - 15:45
The new AC grid access solution from Siemens consists of an offshore transformer module (OTM), which is directly connected to a turbine and installed as a distributed transmission set. (Graphic: Siemens)
The new AC grid access solution from Siemens consists of an offshore transformer module (OTM), which is directly connected to a turbine and installed as a distributed transmission set. (Graphic: Siemens)

To reduce costs, Siemens will, in future, turn to decentralized solutions rather than the conventional platforms currently stationed in offshore wind parks. An offshore transformer module (OTM), as a distributed transmission set, is attached directly to the foot of the wind turbine. The nominal rate per module is 250 MW, which means that for larger wind parks several of these systems are required.

On Jacket foundations the OTM can be installed onto the base of a wind turbine, and with monopoles it can be installed onto the transition piece – similar to a balcony. Due to the far distance to the coastline in Germany, for instance, the mainly used AC transformer platforms cannot be replaced by this new solution. However, Tim Dawidowsky, CEO at Siemens Transmission Solutions “wouldn’t be surprised, if a similar solution will also be found for

Building, transport, installation, operating and maintenance of conventional platforms pose a major part of grid connection costs. Siemens wishes to lower that rate by about 40 % with its new solution that is smaller by about a third and lighter than conventional transformer stations. A special heavy lift vessel for transport and installation is not needed anymore, saving further costs. Siemens counts better availability of the usual installation vessels among other reasons as to why the period of installation may be shortened by about 20 %. Reducing the size of the device was made possible by Siemens focusing mainly on the electrical building parts necessary for the transportation of electricity. No accommodations, no helicopter platform, no diesel generators.

Same turbine, better performance

A further measure for lowering costs will be the new SWT-7.0-154. New magnets and generators helped Siemens optimize the performance of the SWT-6.0-154 by a whole 7 MW, which should bring an additional yield of nearly 10 % – at about the same expenditure. With this wind park, Siemens is aiming to reach 10 €-ct/kWh by 2020.

A first installation of the new type has already been built by Siemens in Danish Brande. In the next days the installation will be started in the test field Østerild. It has not already been clarified, if there should be small batch production in Denmark or in England, Michael Hannibal, Offshore CEO at Siemens Wind Power states. Serial production is planned for 2017, however.

Veja Mate looks to Siemens

Last but not least, or as Hannibal put it as „cream on the cake“, Siemens then announced in Copenhagen that they will provide, service and install the turbines for the offshore wind park Veja Mate. Veja Mate will have a capacity of 400 MW and lies next to Bard 1 in the cluster BorWin. In March 2017 the installation of these turbines shall begin – the proven 6 MW turbine shall be used. Highland Group will realise the project.

Katharina Garus

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