Next year Siemens will start producing three new models of onshore wind turbines. They will maximize the output at low and medium wind speed, and reduce noise. The announcement was made this week at WindEnergy 2016, the trade show in Hamburg.
Compared to previous versions, Siemens has improved the aerodynamics so that energy generation is optimised in areas with moderate winds and in noise-sensitive sites. All three turbines share the same nacelle design.
With rotor-blades based on hybrid-carbon technology by LM Wind Power, the new SWT-3.15-142 will be able to harvest 10 gigawatt hours (GWh) of energy per year even at wind speeds of only six meters per second.
The next version of the category, the new SWT-3.6-130, will ensure an annual energy output of 17 GWh at 8.5 meters per second, an improvement of 6 % compared to the predecessor.
The SWT-3.3-130LN is the low noise version of the SWT-3.3-130, which operates with reduced rotor speed and improved aerodynamics. The noise of a wind turbine in activity is primarily caused by the fast air stream passing the tips of the rotor. To reduce it, vortex generators are placed on the blade surface and trailing edges are equipped with a combination of serrations and combs so that combed teeth elements create fine vortices where the fast air stream from above meets the slower air stream below. As a result, the noise level is reduced by nearly 2 decibels compared to the previous version, reaching 104.9 decibels at a wind speed of six meters per second. This turbine can harvest around 11 GWh annually at an average wind speed of 6.5 meters per second and 16 GWh at 8.5.
“Our customers benefit not only from benchmark setting performance in different wind classes, but also from the adaptability of our technology that meets nearly every site-, grid- and project specific requirement. Thanks to digitalization, these turbines are open for further optimization and individualization,” said Thomas Richterich, CEO Onshore of the Siemens Wind Power and Renewables Division.
All new models benefit from a short time-to-market. The new low noise turbine and the medium wind speed turbine will go into serial production early in 2017, the low wind speed turbine later in the year.