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Reaching Higher Hub Heights With the Hybrid Tower

Max Bogl fig 1Combining Precast Concrete Parts and Steel Elements
Wind turbine performance is constantly improving. With this trend comes ever higher hub heights – a development that will also continue in the coming years. As turbine performance increases, political and economic demands regarding the profitability of wind turbines are likewise increasing. Turbines with capacities above 4MW will become the norm even for onshore sites. To effectively meet these challenges, innovative solutions from manufacturers are needed. Tower concepts such as the hybrid tower, which combines precast concrete parts and steel elements, are opening up new technical possibilities.
 
By Jürgen Joos, Chief Financial Officer, Max Bögl Wind, Germany

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Dynamic Cables for Floating Offshore Wind

ORE fig 1 newInvestigating the Impacts of Dynamic Mechanical Stresses on Fatigue Life of Dynamic Cables
Floating platform wind turbines will require cables to run through the water column from their platform base at the water surface to the touchdown point on the seabed. This trajectory exposes the cable to dynamic environmental forces, such as waves and currents. The Offshore Renewable Energy Catapult (ORE Catapult) and the Industrial Doctoral Centre for Offshore Renewable Energy (IDCORE) have been investigating the impact of this dynamic marine environment on a dynamic cable’s fatigue life, with the aim of reducing uncertainty and improving the reliability of dynamic cables. The aim of this project is to allow more effective planned maintenance offshore through the prediction of a failure of a dynamic cable.
 
By David Young, IDCORE and ORE Catapult, and Lars Johanning, University of Exeter, UK

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Evolution of Wind Resources Over the Last 30 to 45 Years

Variability Analyses and Considerations About Uncertainty for Long-Term Prediction
Eoltech Image1The evolution of long-term wind resources is a key issue in the wind industry, especially in the context of energy yield assessments. Thus, analysing the evolution of the long-term wind trends in the past should allow a better appreciation of their variability and potentially the risk of experiencing periods with low wind resources in the future.
 
By Marion Jude, Eoltech, France

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Scaling Up Offshore Turbine Platforms

Ingeteam new optimal power conversion achitecture offshoreSupply Chain Holistic Approach to Offshore Wind Levelised Cost of Electricity Competitiveness
Zero-subsidy offshore wind projects awarded in Germany and the Netherlands in 2018 have raised expectations worldwide. However, although these are significant competitiveness milestones, they are still bound to the particular market characteristics that made them possible.
 
Javier San Miguel Armendariz, Global Sales Director Wind Energy, Ingeteam, Spain

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What To Do With the Ageing German Wind Fleet?

Hannover figure 1The Optimal Choice Between Continued Operation, Repowering and Decommissioning
More and more players in the German wind energy sector are concerned with the question of how to deal with the ageing German wind fleet, as around 5,200 turbines will simultaneously reach the end of the feed-in-tariff funding period of the Renewable Energy Sources Act for the first time at the end of 2020. Around 8,000 wind turbines will follow by the end of 2025, as shown in Figure 1. Operators of affected wind turbines will then have the choice between (I) continuing to operate the old turbine within the framework of direct marketing on the European Power Exchange, (II) repowering the old turbine by a new and more efficient wind turbine at plant-specific feed-in premium levels tendered in the German renewable energy auctions or (III) decommissioning the respective plant.
 
By Jan-Hendrik Piel and Martin Westbomke, Germany

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Cybersecurity and the Vulnerability of Wind Farms

Baywa fig 1The Digital Threat to Wind Farms
A number of high-profile hacking cases have hit the headlines in recent years, highlighting the increasing rise in cybercrime and the devastating effects it can have on the targeted organisations. Mohamed Harrou, supervisory control and data acquisition (SCADA) engineer at BayWa r.e., talks to Windtech International about the susceptibility of wind farms to cybercrime and why the time to act is now.
 
By Mohamed Harrou, SCADA Engineer, BayWa r.e., Germany

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Yaw Bearing System Fault Detected

BK Vibro 1a  BK Vibro 1b 
Two Case Studies Demonstrate a Remote Condition Monitoring Strategy
After remotely monitoring several thousand wind turbines over the past 10 years, most of the wind turbine faults detected and diagnosed by the Brüel & Kjær Vibro Surveillance Centres have been related to the drive train. In this article, two case studies are given where the faults were detected and diagnosed in an entirely different but important component – the yaw bearing system. It is this system that bears the enormous static and dynamic loads of the nacelle and blades, and allows the nacelle to align itself into the wind.
 
By Mike Hastings, Senior Application Engineer, Brüel & Kjær Vibro, Denmark

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