Baltic 2 offshore wind farm

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Offshore wind farm "EnBW Baltic 2"
Baltic 2 from the south of the chalk cliffs of Møns Klint
Baltic 2 from the south of the chalk cliffs of Møns Klint
location
Baltic 2 offshore wind farm (Baltic Sea)
Baltic 2 offshore wind farm
Location in the German EEZ in the Baltic Sea
Coordinates 54 ° 58 '24 "  N , 13 ° 10' 40"  E Coordinates: 54 ° 58 '24 "  N , 13 ° 10' 40"  E
country Germany
Waters Baltic Sea
Data
Type Offshore wind farm
Primary energy Wind energy
power 288 MW (electric)
owner EnBW Energie Baden-Württemberg
operator EnBW Baltic 2 GmbH & Co. KG
Project start 2001
Start of operations Spring 2015
turbine 80 × Siemens SWT-3.6-120
Energy fed in per year 1200 GWh
Website www.enbw.com
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The EnBW Baltic 2 wind farm (formerly Kriegers Flak) is an offshore wind farm in the German EEZ of the Baltic Sea , on the border with the Danish and Swedish EEZ, 32 km north of the island of Rügen . The offshore wind farm covers an area of ​​27 km² and consists of 80  wind turbines and a transformer platform . The standard energy capacity is 1.2 billion kWh per year.

history

The project was started in 2001 under the name "Kriegers Flak" by Offshore Ostsee Wind AG . After passing the environmental impact assessment , the Federal Maritime and Hydrographic Agency (BSH) approved the project on April 6, 2005.

After the complete takeover of the shares in Offshore Ostsee Wind AG in May 2008, the energy supply company EnBW realized the wind farm. In 2010 all major orders for the project with the new name "Baltic 2" were awarded. Construction on the wind farm was supposed to start in 2012, but had to be postponed to summer 2013.

The construction of the foundations was delayed due to the difficult building site. Installation of the foundations began in August 2013. From summer 2014 the 80  wind turbines were built. In January 2015, all the foundations were in place and half of the wind turbines were erected. The commissioning of the offshore wind farm was scheduled for spring 2015.

In the “Windpower Offshore Base Mukran” in the Sassnitz ferry port , the components for the wind turbines produced in Denmark were stored, assembled and then transported to the construction site. The preparatory work was carried out from here in order to assemble and load the foundations weighing 500–930 tons. The Sassnitz ferry port acts as the base port, but components and ships that were involved in the construction also came from other ports such as B. Rostock .

The first plants started generating electricity in April 2015. The last system was installed in mid-June; At this point in time, more than half of the systems were already in operation. At the beginning of August, all systems had already fed electricity into the grid and also completed a 240-hour test run. The official commissioning took place in September 2015.

After the wind farm was fully operational, the Australian financial investor Macquarie Capital received almost half of the shares in the OWP "EnBW Baltic 2" (49.89%). The operation and maintenance of the systems remained in the hands of EnBW.

technical structure

The second German offshore wind farm in the Baltic Sea, in addition to the EnBW Baltic 1 wind farm that is already in operation , is located 32 kilometers north of the island of Rügen on an area of ​​27 km² and water depths of 23 to 44 m. The 80 individual wind turbines (WTs) together have a nominal output of 288  MW . The Siemens SWT-3.6-120 wind turbines each have a nominal output of 3.6 MW, a hub height of 78.25 m above the water, and a rotor diameter of 120 m. The rotor area of ​​a turbine is 11,300 m².

Foundations

The individual foundations had to be adapted to the different water depths (23–44 m). Depending on the water depth, monopiles are used up to 35 m, and three-legged jackets are used from 35 m . The foundation piles of the jackets and the monopiles were anchored in the seabed with a ram from a special ship.

The monopiles were driven up to 36 m into the sea bed with the help of the Svanen , an almost 100 m high installation platform. Connecting elements for the towers, the so-called transition pieces, were then installed on the monopiles. These were firmly connected to the monopiles using special cement. The foundation piles of the jackets were anchored in the sea bed from the jack-up platform Goliath (an installation platform ). A ram brought the piles up to 55 m deep into the seabed. The other piles were brought to the construction site from Rostock. In a second step, the jackets were placed on the piles.

Wind turbines

Construction work in the EnBW Baltic 2 wind farm

From summer 2014, the wind turbines were installed on the foundations . These were manufactured at various locations in Denmark and brought by sea to the base port of Sassnitz-Mukran. There the steel towers, the actual wind turbines (so-called nacelles) and the rotor blades were preassembled and stored two to three months before the start of installation.

The components were then brought to the construction site in several trips by the installation ship Vidar and installed there. In order to lift the heavy weights, the ship stood with its legs firmly on the sea bed and lifted itself up about 10-15 m above sea level. The 256 t heavy and around 66 m high steel towers were placed on the foundations with a crane and bolted. Then the 150-tonne nacelles with the generator and the gearbox were assembled, and finally the individual rotor blades were used.

Innerpark cabling

The internal cabling of the wind farm (from the individual wind turbines to the transformer platform in the wind farm) is around 85 km long. The cables required for this were transported directly from Norway to the construction site. These 11.9 or 14 cm thick submarine cables are not only used to transport electricity, the information and data between the systems and the control room in Barhöft are also exchanged via highly sensitive optical fibers that are integrated into the cables.

Transformer platform

Transformer platform and grid connection

To avoid excessive transmission losses , the voltage on the transformer platform (installed in the wind farm area at the end of September 2014) is transformed from 33 kV to 150 kV. The electricity is transported from here via the so-called export cable via the location of the transformer platform of the EnBW Baltic 1 wind farm to the Bentwisch transformer station on land. Here the voltage is stepped up from 150 kV to 380 kV and fed into the German network by 50Hertz Transmission GmbH .

Connection to the Danish transmission network

The wind farm Baltic 2 is equipped with two three-phase - submarine cables over the platforms of the Danish wind parks soldier Flak with Rødvig on the main Danish island of Zealand , respectively. In 2019, the transmission networks of both countries were connected with this interconnector Combined Grid Solution and the cable connection of the offshore wind farms Baltic 2 and Baltic 1 for the exchange of electricity.

See also

Web links

Commons : Baltic 2  - collection of images, videos and audio files

literature

  • Home port for EnBW Baltic 2 in Sassnitz-Mukran . In: Schiff & Hafen , issue 2/2011, p. 42, Seehafen-Verlag, Hamburg 2011, ISSN  0938-1643

Individual evidence

  1. ↑ a b https://www.enbw.com/unternehmen/konzern/energieproduktion/neubau-und-projekte/enbw-baltic-2/
  2. ↑ First wind farm in the Baltic Sea approved. In: FAZ.net . April 6, 2005, accessed October 13, 2018 .
  3. ↑ https://www.enbw.com/unternehmen/presse/pressemitteilungen/presse-detailseite_9960.html
  4. ↑ https://www.enbw.com/unternehmen/presse/pressemitteilungen/presse-detailseite_10357.html
  5. ↑ Construction of "Baltic 2" is delayed . In: Daily port report of October 1, 2012, p. 4, ISSN  2190-8753
  6. ^ "Baltic 2": Half of the wind turbines finished . In: Daily port report of January 29, 2015, p. 2
  7. ↑ a b c d e f g https://www.enbw.com/unternehmen/konzern/energieproduktion/neubau-und-projekte/enbw-baltic-2/technik.html
  8. ↑ New offshore wind farms in the North and Baltic Seas are supplying the first electricity . In: IWR , April 29, 2015, accessed April 30, 2015
  9. ↑ Offshore wind farm EnBW Baltic 2 on the home straight . In: Mittelstand-Nachrichten , June 12, 2015, accessed on June 12, 2015
  10. ↑ dpa-infocom GmbH: Offshore wind farm "Baltic 2" completes trial operation. In: welt.de . August 4, 2015, accessed October 7, 2018 .
  11. ↑ Baltic 2 feeds electricity into the grid . In: n-tv , September 21, 2015, accessed on September 21, 2015
  12. ↑ EnBW Baltic 2, project description, reference to Macquarie's financial participation
  13. ↑ Michael Schneider: Siemens to supply 80 wind turbines for offshore project Baltic 2. In: welt.de . June 10, 2010, accessed October 7, 2018 .
  14. ↑ http://www.enbw.com/media/konzern/docs/energieproduktion/enbw-flyer-baltic-2.pdf
  15. ↑ Offshore: Construction of the “Baltic 2” wind farm can begin . In: Daily port report from August 14, 2013, p. 16
  16. ↑ Frank Binder: Start of handling of large components · Deliveries by sea from Denmark to Sassnitz-Mukran for the "EnBW Baltic 2" wind turbines . In: Daily port report from June 5, 2014, p. 4
  17. ^ Frank Binder: Platform in the target area . In: Daily port report of September 30, 2014, p. 4
  18. ↑ Nautical Chart 64 Fehmarnbelt to Sund , 12th edition from November 22, 2019, BSH , Hamburg / Rostock 2019, ISBN 978-3-96490-001-2
  19. ↑ Combined Grid Solution - Kriegers Flak (CGS). 50Hertz Transmission , accessed July 17, 2019 .