Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Siemens has installed first offshore platform in the North Sea

26.08.2013
  • HelWin1 North Sea platform will supply more than 500,000 households with wind power
  • Commissioning of grid connection HelWin1 on schedule for 2014
  • More than 100 employees performing installation at sea

Siemens has installed the HelWin1 offshore platform in the North Sea, marking the successful completion of a significant stage in German grid connection projects. HelWin1 will link the two offshore wind farms Nordsee Ost and Meerwind to the mainland.


Siemens has installed first offshore platform in the North Sea

Using the Siemens technology installed on the platform, the alternating current power generated by the wind turbines is transformed into low-loss direct current for transmission onto land. Starting next year, this will enable the network operator and purchaser TenneT to supply clean electricity to more than 500,000 German households on the mainland.

The land-based station, also supplied by Siemens to TenneT, is located northwest of Hamburg in Büttel, where electricity will be converted back into the alternating current power required for feeding into the grid.

"With the installation of our platform at sea we have successfully mastered the most critical part of this project and are now in the final stretch for commissioning in 2014", stated Karlheinz Springer, CEO of the Power Transmission Division within the Energy Sector of Siemens AG.

"Installation of the platform for HelWin1 constitutes reaching a key milestone in our series of grid connection projects. The transmission capacity of our projects involves a total of 6.2 gigawatts of electric power from renewable sources. TenneT is thus contributing to offshore wind energy assuming a substantial role in the future's energy supply," remarked Lex Hartman, member of TenneT management board.

The network operator TenneT contracted the consortium consisting of Siemens and the Italian cable specialist Prysmian for the HelWin1 offshore grid connection in 2010. This consortium is implementing a total of four North Sea grid connection projects for TenneT; HelWin1 and HelWin2 off of Helgoland, BorWin2 off of Borkum and SylWin1 off of Sylt.

After seven days of transport at sea and four days of installation on site, the HelWin1 platform was anchored at its final position northwest of the island of Helgoland on August 23. Siemens had installed the platform's support substructure at this location in June in the 23-meter-deep North Sea. Ten steel pilings up to 3.2 meters in diameter and with a wall thickness of eight centimeters were anchored in the seabed for attachment of the structure. With a length of up to 100 meters, these pilings are as tall as the famous London landmark Big Ben. The platform is installed 22 meters above sea level to protect it against giant waves. HelWin1 is designed for decades of operation in the rugged North Sea.

The platform is equipped with a helipad and was fabricated by Nordic Yards at the shipyard in Wismar under contract by Siemens. Nordic Yards has been contracted by Siemens with the fabrication of two more HVDC platforms for the grid connections BorWin2 and SylWin. At 12,000 tons, the HelWin1 platform weighs more than 20 loaded and fully tanked Airbus A380 super airliners. The surface area of the platform, at 75 by 50 meters, is more than half the size of a soccer field. The platform's seven decks, spanning a total height of 27 meters, accommodate 16 cabins for crewmembers with a total of 24 berths, a galley, sanitary facilities, a multi-purpose room equipped with sports equipment and a day room with satellite TV, in addition to housing all the technology and equipment required for HVDC transmission.

Up to 100 employees will be active on the platform for the subsequent project phase in the North Sea. They will first re-open the doors and panels previously welded closed for transport and remove other protective transport fixtures and ballast weights. An on-site jack-up platform, which is a kind of mobile logistics and accommodation platform, will be used to prepare the supplies and quarters for the crew. The team thus will save travel time of two hours each to and from the platform by helicopter, or of up to 16 hours each way by ship.

Now, the two subsea cables from the well-established cable specialist Prysmian are also to be connected. Siemens' consortium partner has supplied and laid in bundle the two cables, each with a length of 130 km, for transmission of 250 kilovolt DC voltage in the future. The cable route covers 85 km at sea and 45 km over land. Both 11 cm thick cables, with its protective steel armoring wire layer and a 35 mm thick copper conductor, weighs about 30 kg per meter.

The HelWin1 HVDC platform has a capacity of 576 megawatts (MW). Thanks to the efficient direct-current technology employed, the total transmission losses for this connection are less than four percent. The HVDC Plus technology employed by Siemens reduces the complexity and, hence, the space requirements for HVDC systems, which is a decisive factor for installation at sea. In contrast to classic HVDC technology used in a vast majority of land links, systems equipped with HVDC Plus feature self-stabilization. This enhances grid reliability in the event of power fluctuations, which can occur with wind-based power generation. HVDC Plus is a multi-level VSC system. This modular, multi-level VSC technology ensures an almost ideal sinusoidal AC waveshape and smoothed direct voltage along the transmission line, that makes the installation of high-frequency and harmonic filters practically superfluous.

The commissioning of HelWin1 is scheduled for the second half of 2014. The platform is completely automated and the systems on the platform can be monitored and controlled from land, with cameras and sensors providing a complete overview of the current operating status. The crews' quarters on the platform can be used when maintenance work is required. Siemens was contracted by TenneT for maintenance of the grid connection for an initial period of five years.

The Siemens Energy Sector is the world's leading supplier of a broad spectrum of products, services and solutions for power generation in thermal power plants and using renewables, power transmission in grids and for the extraction, processing and transport of oil and gas. In fiscal 2012 (ended September 30), the Energy Sector had revenues of EUR27.5 billion and received new orders totaling approximately EUR26.9 billion and posted a profit of EUR2.2 billion. On September 30, 2012, the Energy Sector had a work force of almost 86,000. Further information is available http://www.siemens.com/energy

Reference Number: EPT201308059e

Contact
Mr. Torsten Wolf
Energy Sector
Siemens AG
Freyeslebenstr. 1
91058 Erlangen
Germany
Tel: +49 (9131) 18-82532
torsten.tw.wolf​@siemens.com

Torsten Wolf | Siemens Energy
Further information:
http://www.siemens.com/energy

More articles from Power and Electrical Engineering:

nachricht Researchers take next step toward fusion energy
16.11.2017 | Texas A&M University

nachricht Desert solar to fuel centuries of air travel
16.11.2017 | SolarPACES

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>