Siemens D7 platform

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SWT-6.0-154 prototype in Sengwarden

The Siemens D7 platform refers to a gearless wind turbine platform developed especially for offshore wind parks by Siemens Windenergie, now Siemens Gamesa . There are various technically related sub-variants with a nominal output of 6 and 7  MW . The diameter of the 3-blade rotor is 154 meters; the 6 MW version can also be supplied with a rotor diameter of 120 meters. The systems are certified for an operation of 25 years.

The prototype of the SWT-6.0-154 (Siemens wind turbine) version built in the Danish wind turbine test field Østerild , which went into operation in early October 2012, was the wind turbine with the largest rotor diameter in the world until October 2013. Then it was replaced by the Samsung Heavy Industries S7.0-171, which has a rotor diameter of 171 meters with a nominal output of 7 MW and this again in 2014 by the Vestas V164-8.0 with 8 MW.

In March 2015, Siemens announced that the SWT-6.0-154 will also be available with 7 MW in the future. The increase in output should enable an additional yield of around 10% in offshore conditions. Technically, the system is largely identical to the 6 MW variant that is still available, only the electrical system has been adapted accordingly for the higher rated output. The prototype of this system was built in May 2015, and the series received the type certificate in February 2016. In July 2016, another sub-variant was presented, which has a nominal output of 8 MW with an unchanged rotor diameter of 154 m and is expected to generate an electricity yield of around 10% higher than the SWT-7.0-154. The prototype was put into operation in January 2017.

In 2015 and 2016, the SWT-7.0-154 was named “Wind Power Plant of the Year” in the offshore wind turbine class by the specialist magazine Windpower Monthly .

technology

Technical specifications SWT-6.0-154 SWT-7.0-154
Nominal power (kW) 6,000 7,000
Cut-in wind speed (m / s) 3-5
Cut-off wind speed (m / s) 25th
Survival wind speed (m / s) 70
Rotor diameter (m) (3 blades) 154
swept area (m²) 18,600
Area (m²) per MW 3100 2657
rotational speed 5-11 / min ?
Power regulation Pitch
transmission No
generator Permanent magnet -
synchronous generator (PMSG)
Mains voltage / frequency 34 kV / 50 Hertz

Machine house

The length of the machine house, on which a helicopter platform is attached, is around 15 meters and weighs around 200 tons, and has a diameter of 6.5 meters. Most of the wind turbine technology is housed in it. In addition to the mechanical drive train, the generator, two converters and other technical equipment such as B. the servomotors or the air conditioning, there is also a transformer that transforms the electricity to medium voltage of 34  kV  AC , the voltage level at which the wind turbines are wired within the wind farm.

The heart of the wind power plant is the generator, which is directly connected to the rotor hub via the rotor shaft, to which the rotor blades are attached; a transmission gear is not available. A synchronous ring generator with permanent magnet excitation and a diameter of 6.5 meters, which produces alternating current with a voltage of 690 V, is used. The current is then brought to a frequency of 50 Hertz by means of two converters that are identical to the (individual) converter of the SWT-3.0-101. This double design also enables the system to continue operating with halved power if one converter fails.

The total weight of the entire tower head, i.e. the machine house including the rotor, is around 350 tons, making the system the lightest in its performance class, according to Siemens.

rotor

Two rotor variants are used: a 120-meter rotor and a rotor with a diameter of 154 meters. While the SWT-6.0-154 type B75 rotor blade was specially developed for this turbine, the 120-meter rotor was already used in the SWT-3.6-120 wind turbine, which has been in production since 2009. The variant with the smaller rotor is intended primarily for locations with height restrictions, e.g. B. can be used by air traffic regulations, since the total height of the system remains below 150 meters.

According to Siemens, the B-75 rotor blade of the SWT-6.0-154 is the world's largest component made of glass fiber from a single cast, the weight is around 25 tons per blade. In contrast to a number of other manufacturers, Siemens does not use CFRP in its rotor blades . With this, the blade weight could have been reduced by 10–20%, but for cost reasons Siemens decided to manufacture them from GRP and balsa wood . At locations with an average wind speed of 9-10 m / s, the B-75 rotor blade should enable an additional yield of 20 to 24% compared to the B58 blade.

Location and yield

According to Siemens, the SWT-6.0 is suitable for every conceivable offshore location. At an average offshore location with an average wind speed of 8.5 meters per second, an SWT-6.0-154 should produce around 23 million  kWh of electrical energy annually, corresponding to the annual consumption of 5500 German households. The 7 MW variant, on the other hand, should be able to deliver up to 32 million kWh of electrical energy per year under offshore conditions.

commitment

The prototype of the SWT-6.0 was the version SWT-6.0-120 in June 2011 at the wind turbine test field Høvsøre built in Denmark, followed by a further pre-production aircraft were set up. Two further test systems with the same rotor type were installed in January 2013 in the British offshore wind farm Gunfleet Sands .

The prototype of the SWT-6.0-154 went into test operation in October 2012. Since the total length of the special transport with its freight, which was not designed for overland transport, was 85 meters, long detours had to be accepted. The SWT-6.0 went into series production in 2014. An overview of the systems ordered can be found in the article List of Offshore Wind Farms .

In July 2012, Siemens received a major order from the Danish energy company Dong Energy for 300 SWT-6.0-154 turbines worth around 2.5 billion euros, which are to be installed in offshore wind farms in Great Britain between 2014 and 2017 . The first commercial project with a total of 35 turbines and 210 MW was the Westermost Rough offshore wind farm , which went into operation in May 2015.

In April 2013, Dong concluded another framework order with Siemens for the delivery of 154 turbines which are to be used in the German offshore wind farms Gode ​​Wind I , Gode ​​Wind II and Gode ​​Wind III from 2015 [obsolete] . In November 2013, Dong Energy called 97 turbines for the offshore wind farms Gode Wind I and II.

In October 2013, the first series machine for the turbine was installed at the Hunterston test wind farm operated by the utility company Scottish and Southern Energy . The wind conditions at this land location are similar to those in an offshore wind farm.

In January 2014 Statoil (Norway) ordered 67 SWT-6.0-154 turbines for the Dudgeon offshore wind farm off Norfolk (UK). The turbines were put into operation in 2017.

In December 2014 two SWT-6.0-154 were erected near Wehlens near Wilhelmshaven . These are the first systems of this type in Germany.

2015 were u. a. 67 SWT 6.0-154 ordered for the Veja Mate offshore wind farm , which went into operation at the end of 2017.

Others

A SWT-6.0 is to serve as a test machine for a research project of the British Energy Technologies Institute and the blade manufacturer Blade Dynamics . The aim of this research project is the construction of a 100 meter long modular rotor blade based on CFRP. Longer rotor blades are seen as a key technology for reducing the electricity production costs of offshore wind energy. A scaled down blade with a length of 80 meters was developed and will be subjected to static and dynamic tests at the end of 2014. Then it will be tested on a SWT-6.0. It is currently unknown whether the SWT-6.0 will eventually also carry the 100-meter blade.

Further development and successor

The D7 platform was also the starting point for the SG 8.0-167 introduced in 2017, which represents an evolutionary stage of the platform and has the same generator diameter, but a larger rotor diameter of 167 meters. Their prototype was set up in 2018 and series production is scheduled to begin in 2020. As its successor, Siemens Gamesa announced the SG 10.0-193 at the beginning of 2019, a 10 MW system with a 193 meter rotor diameter, which has been completely redeveloped and will have a larger generator diameter in addition to longer rotor blades. The prototype of this system is to be built in 2019, with series production starting in 2022.

Web links

Individual evidence

  1. ↑ a b Siemens 6MW turbine certified . In: Windpower Offshore , July 24, 2014, accessed on July 24, 2014.
  2. ↑ World's largest offshore turbine built . In: Renewable Energies. The magazine , October 25, 2013, accessed on October 28, 2013.
  3. ↑ Siemens presents new 7 MW offshore turbine . In: IWR , March 12, 2015, accessed March 13, 2015.
  4. ↑ a b Siemens erects a wind turbine with an output of seven megawatts . In: IWR , May 19, 2015, accessed May 19, 2015.
  5. ^ Siemens and Adwen gain type certificates . In: Windpower Offshore , February 16, 2016, accessed on February 17, 2016.
  6. ↑ Siemens confirms 8MW platform . In: Windpower Offshore , July 5, 2016, accessed on July 6, 2016.
  7. ↑ Siemens powers up 8MW prototype . In: Windpower Offshore , January 30, 2017, accessed January 30, 2017.
  8. ^ Turbines of the year: Offshore turbines. In: Windpower Monthly . December 28, 2015, accessed January 9, 2016 .
  9. ^ Turbines of the year: Size matters for industry awards . In: Windpower Monthly , December 31, 2016, accessed January 3, 2017.
  10. ↑ The new SWT-7.0-154 (PDF file). Siemens Internet site, accessed July 3, 2015.
  11. ↑ a b Reputation on the line with new 6MW . In: Windpower Monthly , May 25, 2012, accessed September 6, 2012.
  12. ↑ Fact Sheet: The new SWT-6.0 (PDF file; 211 kB). Siemens Internet site, accessed September 6, 2012.
  13. ↑ a b Fact Sheet B75 rotor blade (PDF file; 247 kB). Siemens Internet site, accessed September 6, 2012.
  14. ↑ Prototype of the new gearless 6 MW wind turbine from Siemens goes into test operation . Siemens press release, accessed September 6, 2012.
  15. ↑ Foundations installation underway at DONG Energy's first UK demo site ( Memento of the original from September 23, 2012 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . In: www.windpoweroffshore.com , September 21, 2012, accessed September 22, 2012. @1@ 2Template: Webachiv / IABot / www.windpoweroffshore.com
  16. ↑ Giants of the Seas: First 6 MW wind turbines installed ( Memento of the original from May 25, 2013 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . In: http://www.cleanthinking.de , January 30, 2013, accessed January 30, 2013. @1@ 2Template: Webachiv / IABot / www.cleanthinking.de
  17. ↑ Fact Sheet Transport B75 (PDF file; 252 kB). Siemens Internet site, accessed September 6, 2012.
  18. ↑ Siemens is building a huge wind farm in Great Britain . In: Die Welt , July 19, 2012, accessed on September 6, 2012.
  19. ^ Siemens to Supply Offshore Wind Turbines to Dong's German Sites . In: Bloomberg LP , April 11, 2013. Retrieved April 11, 2013.
  20. ^ Siemens nets big wind farm order from Denmark's Dong Energy . In: Deutsche Welle , November 18, 2013, accessed on November 18, 2013.
  21. ↑ New gearless 6 MW wind turbine from Siemens being tested . Retrieved October 24, 2013.
  22. ↑ First 6 MW Siemens plant installed in Germany . In: Sonne Wind & Wärme , December 2, 2014, accessed on December 9, 2014.
  23. ↑ Work starts on 'very long blade' prototype . In: Windpower Monthly , December 17, 2013, accessed December 20, 2013.
  24. ↑ Latest 10MW turbine launched by SGRE . In: Windpower Offshore . January 16, 2019. Retrieved January 17, 2019.
  25. ↑ Siemens Gamesa and GE set up new super turbines . In: Renewable Energies. The magazine . January 17, 2019. Retrieved January 17, 2019.