After Siemens Energy was already appointed to supply the turbines for the wind farm, the company also received the order to connect London Array to the power supply network. Purchasers are Dong Energy, E.ON and Masdar, the wind farm’s owners. The order volume is EUR128 million. The wind farm is scheduled to be completed by 2012 and will be hooked up to London’s power supply network via the Siemens grid connection.
The wind farm is being erected in the Thames estuary approximately twenty kilometers off the Kent and Essex coasts. An option is also provided for uprating London Array to as much as 1000 MW. The wind farm will thus become the first in the 1-gigawatt class. That will be sufficient to supply 750,000 British households with eco-friendly electricity, which is equivalent to approximately a quarter of the population of Greater London. “Offshore wind farms of this size place particular demands in terms of grid access. We not only have the requisite technology and know-how but also a wealth of experience in connecting offshore wind farms to the grid,” said Udo Niehage, CEO of the Power Transmission Division of Siemens Energy.
Siemens will supply the electrical equipment for two offshore substation platforms, which will be installed right at the wind farm. The substations bundle the power generated by the 175 Siemens SWT-3.6 wind turbines, each rated at 3,6 MW, before it is transported via high-voltage subsea cable to the coast. On each of the platforms there are two 180-MVA transformers and medium-voltage switchgear. The requisite protection and instrumentation and control equipment is also installed on the platforms. Distribution over two platforms has the advantage that the cable routes within the wind farm are short, and power transmission losses are kept as low as possible to enhance the wind farm’s energy efficiency.
The transformers on the substation platforms step up the 33 kilovolts (kV) generated by the wind turbines to a transmission voltage of 150 kV. High-voltage subsea cables transport the electricity to the grid access point, which is located in Cleve Hill. In addition to a substation with four 180-MVA power transformers (400/150 kV) Siemens will also install four 50-MVAr reactive-power compensators at this access point to fulfill the British grid’s requirements (Grid Code) on the quality of the electrical energy fed into the grid.
For that purpose Siemens will deploy its new SVC Plus system. It operates with innovative voltage-sourced converter (VSC) technology and is continuously controllable with the aid of insulated-gate bipolar transistors (IGBTs). The central feature of SVC Plus, a further refined statcom (static synchronous compensator), is its modular multilevel converter technology. By contrast with other self-commutated converter topologies the voltage waveform generated is practically sinusoidal because of the multilevel technology. This means that the low-frequency harmonic filters required in solutions used to date are no longer needed and significantly less space is required for the overall system.
Siemens will also prepare the requisite design studies for grid access for all of the wind farm’s electrical components and prepare the grid studies to demonstrate fulfillment of grid access requirements.
The provision of energy-efficient grid access for offshore wind farms is part of Siemens’ Environmental Portfolio. In fiscal 2009, revenue from the Portfolio totaled about €23 billion, making Siemens the world’s largest supplier of eco-friendly technologies. In the same period, our products and solutions enabled customers to reduce their CO2 emissions by 210 million tons."
The Siemens Energy Sector is the world’s leading supplier of a complete spectrum of products, services and solutions for the generation, transmission and distribution of power and for the extraction, conversion and transport of oil and gas. In fiscal 2009 (ended September 30), the Energy Sector had revenues of approximately EUR25.8 billion and received new orders totaling approximately EUR30 billion and posted a profit of EUR3.3 billion. On September 30, 2009, the Energy Sector had a work force of more than 85,100.
Dietrich Biester | Siemens Energy
Engineers program tiny robots to move, think like insects
15.12.2017 | Cornell University
Electromagnetic water cloak eliminates drag and wake
12.12.2017 | Duke University
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences