When the wind causes the huge rotors to turn, it generates turbulence, which interferes with the operation of the wind turbines in the rows to the rear. To address this problem, the new software program simulates the behavior of the entire wind farm and adjusts the individual turbines’ performance with one another.
According to experts, this could increase the energy yield by several percent, as reported in the latest issue of the research magazine "Pictures of the Future". The same method could also be used to reduce the mechanical stress on the wind turbines, thus extending their service life. The software is currently undergoing endurance testing at Sweden’s Lillgrund wind farm.
Offshore wind turbines are gigantic; the 48 Siemens turbines in Lillgrund tower 115 meters above the water’s surface. The rotors have a diameter of 93 meters, and the wind causes them to create kilometer-long trails of turbulence. As a result, turbines located behind the first row can’t operate smoothly, causing their electricity output to fluctuate. In addition, the turbulence makes the turbines vibrate, which accelerates the process of wear and tear. A wind turbine is designed to operate for about 20 years. If it can run longer than that, the wind farm can supply more energy without requiring any additional investment.
Researchers at Siemens Corporate Technology have now developed a computer model that simulates entire wind farms. Using measurements of wind and rotor speeds, temperature, and turbine output, the software calculates airflows and determines the behavior of all of the turbines, enabling it to set the parameters for operating the wind turbines with as little turbulence as possible. The turbines’ output is adjusted by means of the generators and the angle of the rotor blades. To make this possible, all of the turbines are connected to a central control system via optical fiber lines. Even though the system reduces the output of individual wind turbines, it increases the yield of the wind farm as a whole and ensures that turbines located farther back are subjected to less strain. Operators can use the program to optimize either the energy yield or the service life. Alternatively, they can use it to optimally balance both of these parameters with each other.
Siemens Wind Power has been testing the software in Lillgrund for the past two years. In the fall the model will be optimized on the basis of the collected measurement data, to be followed by a pilot phase. Offshore wind farms are part of Siemens’ environmental portfolio, with which the company generated about €28 billion in sales in fiscal year 2010.
Dr. Norbert Aschenbrenner | Siemens ResearchNews
Monocrystalline silicon thin film for cost-cutting solar cells with 10-times faster growth rate fabricated
16.03.2018 | Tokyo Institute of Technology
Research gets closer to producing revolutionary battery to power renewable energy industry
15.03.2018 | University of Kansas
Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...
On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...
The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...
At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.
When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...
At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.
Drones play an increasingly important role in the area of logistics and services. Well-known logistic companies place great hope in these compact, aerial...
16.03.2018 | Event News
13.03.2018 | Event News
08.03.2018 | Event News
16.03.2018 | Earth Sciences
16.03.2018 | Physics and Astronomy
16.03.2018 | Life Sciences