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- Category: Articles
Climate Change Impact on Yield-Relevant Parameters and Annual Energy Production
The question of how climate change will affect the energy yield of wind farms during their operating period has been increasingly raised at conferences and industry meetings. However, when determining wind potential, wind data from the past is generally used to determine the average wind and energy yield conditions to be expected during the future operating period of the planned wind farm. This is done under the assumption that the wind conditions of the past will also exist in the future. To consider climate change, GEO-NET studies its impact on the yield-relevant quantities and thus estimates the future yield of wind farms using various climate scenarios. The estimation is based on the coupling of an ensemble of regional climate projections from the CORDEX initiative for various representative concentration pathway scenarios with the computational fluid dynamics model FITNAH-3D. Exemplary results of the applied method are given, and their significance is discussed.
By Simone Pfau, GEO-NET Umweltconsulting, Germany
- Category: Articles
High-Altitude Modular Post-Tensioned Concrete Wind Towers
In the race for efficiency and innovation, the wind energy sector is rethinking the very shape and logistics that define its towering giants. The industry has focused on the circular shape for towers because of its low aerodynamic drag coefficient. What if, thinking outside the box, this shape were dropped from the overall design and a new approach similar to buildings was accessed? Imagine wind towers that rival the height of city landmarks, harnessing greater wind capacities while revolutionising transportation logistics. Could these giants be modular, swiftly transported like ubiquitous shipping containers, seamlessly moving across road, rail, oceans and even the skies? The challenge extends beyond mere height – it is about speed and scalability. Can wind towers be prefabricated in factories and assembled with automotive efficiency? These questions push boundaries, urging us to shatter conventional paradigms while leveraging the very strengths of standardised container logistics.
By Andrés de Antonio, Aeventor, USA
- Category: Articles
What Is the Industry Willing to Accept to Confront It?
Floating lidar systems have revolutionised the offshore wind industry by enabling the bankability of projects at a fraction of the original cost – successful wind resource assessment campaigns are essential for the economic viability of the wind farm development process. However, one parameter measured in such campaigns – turbulence intensity – is at the centre of debate. Its accuracy, with respect to the traditional definition, is known for not reaching industry standard levels, representing a serious problem because of the lack of consensus within the industry on how to address and solve this matter. The complexity of this phenomenon means that there is no optimal solution. Several suboptimal alternatives are currently under development, but there is not yet a clear picture of which is the right option. However, this might be about to change.
By Adrià Miquel and Giacomo Rapisardi, Eolos Floating Lidar Solutions, Spain
- Category: Articles
Data Availability Impacts Uncertainty of Long-Term Corrected Wind Surprisingly Little
According to common guidelines for the evaluation of site-specific wind conditions, a measurement campaign should have at least 90% data availability during a consecutive 12-month period in order to be complete. However, obtaining this high data availability with a Doppler lidar can be a challenge in locations with small amounts of atmospheric aerosols, for example in the Nordic countries or mountainous regions. Regardless of the lower data availability, the data measured in these locations can still hold valuable information that can be used to reduce uncertainties in a wind resource assessment. Therefore, we suggest that instead of discarding data with less than 90% data availability, the uncertainties due to the lower lidar data availability should be quantified and considered in the wind resource assessment. This is in line with the upcoming IEC framework for the assessment and reporting of the wind resource and energy yield.
By Pyry Pentikäinen, Adviser, Kjeller Vindteknikk, Finland
- Category: Articles
Windborne to Identify Yaw Misalignments Across a Large Fleet of Wind Turbines
According to a technical report by the National Renewable Energy Laboratory (referring to the multi-year Wind Plant Performance Prediction project), modern wind power plants in the United States were underperforming in their expected annual energy output by 3.5%–4.5%.’ [1] There are many potential causes of wind turbine underperformance. Among these are forms of underperformance caused by rotor-disrupted and/or poorly calibrated nacelle-based wind sensors that in turn feed inaccurate wind data to core wind turbine systems.
By Itay Mor, Boaz Peled, Alex Alpert, and Guy Yakir at First Airborne, Israel
- Category: Articles
Using Drone Data to Calculate Blade Erosion AEP Loss
It is well-known that blade surface degradation, especially leading-edge erosion, leads to increased risk for turbine operators. The operational risk consists of structural and aerodynamic components, and both should be considered when planning the most effective site-specific operations and maintenance strategy.
By Nicholas Gaudern, Chief Technology Officer, PowerCurve, Denmark
- Category: Articles
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