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- Category: Articles
Machine Learning Techniques Reduce Uncertainty in Long-Term Performance Reference
EWC Weather Consult, a German pioneer in the optimisation of weather data, has developed a long- term correction method for wind measurements giving far superior results. By using machine learning processes EWC has created a method that successfully minimises yield uncertainties. The new method makes it possible to use non-linear corrections, and by doing so the error in the yield estimates on a wind time-series can be reduced to only 3% on average, even for very complex sites. This is half the error level achieved using the matrix method and one-fifth of the error associated with sector-based linear regression in site assessments.
By Jon Meis, Managing Director, EWC Weather Consult, Germany
EWC Weather Consult, a German pioneer in the optimisation of weather data, has developed a long- term correction method for wind measurements giving far superior results. By using machine learning processes EWC has created a method that successfully minimises yield uncertainties. The new method makes it possible to use non-linear corrections, and by doing so the error in the yield estimates on a wind time-series can be reduced to only 3% on average, even for very complex sites. This is half the error level achieved using the matrix method and one-fifth of the error associated with sector-based linear regression in site assessments.By Jon Meis, Managing Director, EWC Weather Consult, Germany
- Category: Articles
A Cloud-Based Modelling Software Uses a New Technique to Extend the Remaining Life of Gearboxes
Wind turbines are intended to last 20 to 30 years, depending on design and site conditions. Unfortunately, this has not been achieved on a consistent basis, which has led to project uncertainty and risk that was not part of the original investment and planning. Using prognostics operators and OEMs can predict future risk even before the site goes into operation and identify actions to extend the life of the wind turbine assets. This leads to identification of risk earlier and the possibility of mitigating that risk through operational and maintenance activities.By Stephen Steen, Manager, New Business Development, Sentient Science, USA
- Category: Articles
Gamesa’s G128-5.0MW Offshore Turbine Prototype
In July 2013, Gamesa’s G128-5.0MW offshore turbine prototype on the Arinaga Quay in the Canary Islands was connected to the grid. With a rated power of 5MW, blades spanning 62.5 metres and a total tip height of 154 metres, this development marks a key milestone in Gamesa’s offshore turbine development strategy. (Click here for impression of inauguration)By Michaela O’Donohoe and Francisco Maza, Gamesa Corporación Tecnológica, Spain
- Category: Articles
Using Oil Analysis Data from Wind Turbine Gearboxes
Wind turbines are sophisticated machines, operating in demanding environments. Therefore, it is very important to select the right lubricant as the proper oil choice can improve wind turbine availability. This article focuses on the challenges in wind turbine lubrication, specifically addressing the use of the synthetic gear oil Mobilgear SHC XMP 320 in the main wind turbine gearbox.By Richard Russo, Kevin Harrington and Sandra Legay, ExxonMobil Fuels & Lubricants
- Category: Articles
A New Generation of AC/DC/AC Converters
The world can be divided into urban and rural areas. Rural areas occupy the largest part of the land. Most of these rural areas are not connected to large grids and are unlikely to be electrified in the future. The costs of installing an electrical grid are too high. In rural areas, and on islands, diesel systems are often used to generate electricity. Electricity generated in this way is expensive. In addition to the cost of diesel fuel, there are other associated costs to be taken into account such as transport, storage and losses. On top of this, diesel generators are relatively inefficient and will only generate about 2.5 to 3.5kWh from one litre of diesel. As a result, the price for electrical energy in isolated grids is high, sometimes reaching 1€ per kWh or more. In remote rural areas, cheaper electricity from wind turbines can make a valuable contribution.By Frits Ogg, Renewable Energy Consultant, The Netherlands
- Category: Articles
Tethered Tools Can Increase Safety and Productivity on Wind Farms
A tool dropped from an elevated work platform poses immediate danger to personnel and equipment below. While there are federally mandated guidelines in the USA for securing people working on surfaces 4 feet (1.22 metres) or more from the ground, there are no such requirements for securing tools. In this article, John Martell discusses why organisations need to implement some type of tethered tool programme in the interests of safety, and how new technologies are making it easier for technicians to use tethered tools.By John Martell, Product Manager, Snap-on Industrial, USA
- Category: Articles
How Geophysics and Multiple Perspectives Could Revolutionise the Wind Industry
Geophysical methods have long been used to help define the underlying physical properties of soil, rock, air and even space. Their uses can be very beneficial for the characterisation of site geology, which would otherwise require large and costly physical evaluations. The beauty and simplicity of geophysics is in its ability to indirectly infer subsurface materials by defining physical traits through the application of geophysical methods.By Daniel Kramer, Environmental Division Manager, Neil O. Anderson & Associates, USA
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