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Home/Grid/Grid developement/Offshore projects/Ostwind 3/Substations onshore/offshore

Substations onshore/offshore

Onshore and offshore substations connect the different voltage levels between the wind farm and the onshore transmission grid. Near Stilow, in the municipality of Brünzow, 50Hertz will build a new substation, where the current will be transformed from 220 kilovolts (kV) to 380 kV. The centrepiece of any wind farm is its offshore substation. Here, all generated electricity is bundled by electricity transmission system operator 50Hertz and transformed to a higher voltage for further transportation to shore.

Onshore substation
Visualisation of the approved substation incl. overhead line towers for the conenction to the overhead line grid.

The substation near Stilow will be built as an air-insulated switchgear. This means that normal air is used as the insulating medium between the live and de-energised parts within the installation. Such air-insulated switchgear require enough space to create sufficient distance and thus enough insulation between the technical equipment.

Accordingly, the larger part of the area on the premises of the substation in Stilow will accommodate the high-voltage equipment or the equipment that is an active part of the power line, the so-called primary technology.

Furthermore, there is a building in each substation in which the so-called secondary technology is situated. This technology functions as the brain of the primary technology. In other words, it protects and controls the grid connection system. The secondary technology acts as protection in the event of a fault and as a control system during normal operation, and is controlled from the 50Hertz Control Center.

Offshore substation
Visualisation of the planned Jasmund offshore substation for the Ostwind 3 project. Source: JVHSI

Offshore wind farms generate high volumes of electricity, which then need to be transported to land and onward towards the consumer. On the high seas, substations (situated on platforms) are used to bundle the electricity generated in the wind farm and to transport it to shore by transforming it to a higher voltage level with as little loss of energy as possible.

Ostwind 3 is the third offshore project to connect the wind farms to the north-east of Rügen island to the grid (see also Ostwind 1 and Ostwind 2). Other than for previous 50Hertz grid connection projects, 50Hertz will not only plan, construct and operate the cable connection, but also the offshore substation.

CONTACT

Tobias Frank

Offshore Projects
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    tobias.frank@50hertz.com
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