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Executing Gigawatt-Scale Blade Inspection Campaigns

SSL Figure 1Drone-Based Technology Platforms
In this article, Sulzer & Schmid Laboratories, a Swiss company developing technology solutions for the inspection of wind turbine rotor blades, explains how drone-based technology platforms suitable for large-scale, multi-gigawatt blade inspection campaigns require a specific set of characteristics that will provide the level of scalability and deployability needed to succeed.
 
By Tom Sulzer, CEO and Co-Founder, Sulzer & Schmid, Switzerland

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Blade Aerodynamic Performance Upgrades

Maximising Blade Performance Through Aerodynamic Optimisation
PC fig 1Every wind turbine blade can be optimised. This is a bold statement but it is based on a number of factors that apply in varying degrees to all turbines: surface contamination and erosion, limitations and assumptions of standard design tools, design compromises to meet time/cost deadlines, adherence to standard wind classifications, and continual development of new technology. How can we go about optimising a blade that has already been installed? This article will describe the different technical methods and solutions available to extract more energy from a rotor, enabling wind turbines to deliver more revenue to their owners and to contribute more to global carbon reduction targets.
 
By Nicholas Gaudern, Chief Technical Officer, Power Curve, Denmark

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The Business of Concrete Foundations

Fig 1 Rute Backfilling a modular precast assembly Minnesota USA 2019And the Modular Case
The wind industry is primed for precast tower foundations. The economics point to significant returns to wind farm contractors and owners as the focus changes to longevity and expanding the construction and OEM delivery season.
 
By David McFeeters-Krone and Chris Fernandes, RUTE Foundation Systems, USA

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Connectors Simplifying Switch Cabinet Construction

Harting fig 1New Techniques Provide Value Chain Savings
New industrial connectors enable the rear mounting of interfaces for switch cabinets. Using this option, all relevant connection steps can be carried out from the inside of a cabinet. Moreover, many installation processes can be shifted to the pre-assembly stage, thus helping to save expensive technician hours in the field. The termination technique can also accelerate processing. For example, the radial cage clamp used by Han ES Press enables a tool-free connection, in addition to offering options for bridging contacts directly on the insert.
 
By Carsten Edler, Industry Segment Manager Wind Energy, Harting Electric, Germany

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Offshore Wind Farm Layout Strategies

Bryce 1Investigating New Designs Through Wake Loss and Cable Topology Optimisation
Offshore wind energy is an emerging technology that is becoming increasingly viable as technical and scientific improvements drive down the levelised cost of electricity making it more competitive with onshore wind technology and other forms of electricity generation.
 
By Bryce Wade, Canada

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Offshore Wind Turbines with Teetering Hinge

Seawind figure 1A New Technology Developed and Optimised for Offshore Use
This article focuses on the main characteristics of two-bladed teetering hinged turbines on top of floating platforms. It highlights how the teetering hinge positively affects fatigue and loads caused by wind–wave interaction and summarises the cost-effective technological choices for the system features and installation method.
 
By Silvestro Caruso, Chief Technical Officer, Seawind Ocean Technology, The Netherlands

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PPA Financing Closes the Gap Between Project Development and Energy Markets

Spiesheim wind farm developed by juwiWhat Will Come After the Germany Renewable Energy Sources Act?
In many places, operators and investors in Germany are asking, ‘What will come after the EEG (Renewable Energy Sources Act)?’ This means the time after the 20-year period with fixed feed-in tariffs. In contrast, in many countries around the globe there are no fixed feed-in rates governed by law at all – investors need to find offtakers for their eco-power from the first kilowatt-hour onward. This is where power purchase agreements (PPAs) come into place. On the other hand, such PPA structures are often also supported by tax or financing benefits or green quotas. Thus, what kind of prospects do PPAs offer for the German energy market?
 
Björn Broda, Head of Corporate Strategy, Communications & Public Affairs Department, juwi, Germany

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