FOWT Motion Reduction – Results from the Eurostars CROWN project

This summary presents the project Motion Reduction of a Concrete Reduced-draft spar for the Offshore floating Wind iNdustry (CROWN) of the partners Seaplace, USTUTT and sowento GmbH. sowento was in charge of the motion reduction sub-project.

As part of the overall project, Seaplace designed a Floating Offshore Wind Turbine (FOWT) with Reduced Spar Design (RDS) platform for a multi-megawatt turbine. The reduction of turbine motion is achieved by integrating an Anti-Heeling and Ballast System (AHBS), Anti-Roll Tanks (ART) and a turbine controller. In addition, a proof-of-concept of a real-time observer was realised within the framework of CROWN. This is used to reconstruct or observe system states that cannot be measured or that are too complex to measure. In cooperation with the IH Cantabria (IHC), a 1:36 scaled test model was designed and built. This was tested and validated as a HIL system in the wave tank of IHC. The term HIL is used to refer to the test model as a system that is embedded in a control system via its inputs and outputs.

Main results

Measured and observed states from the wave tank testing.

With a focus on the evaluation of the measurements, the most important results for sowento are summarized below:

  • Validation of the reduced model SLOW. During the measurement campaign of the scaled FOWT prototype, the SLOW model could be validated. Hereby, the reliability and robustness of the model could be confirmed under consideration of aerodynamics, structural dynamics, hydrodynamics and control.
  • Validation of the turbine controller. The controller concept with feedback controller of the RDS plat- form was developed, tested and proven to contribute to the reduction of turbine motion.
  • Proof-of-concept of the real-time observer. The measured and observed states showed good agreement. Through the scaled test of the RDS-FOWT, the effective functionality of the real-time observer could be shown. In this context, conducting real tests is a significant step to move from a concept level to an implementation level.

sowento will build on the results to commercialize the digital twin as a platform solution for FOWT load and condition monitoring. It will be combined with a flexible number of sensors, including a nacelle-based lidar for a low-uncertainty reconstruction of the FOWT behavior in every instance of time.

Download the summary report here.

Book a meeting to learn more and to discuss your project need

Contact us for your specific request

sowento experts are available to discuss your specific request and tailor our service offer to your needs. Continuously, we expand our knowhow to be able to provide every project with the best mix of expert knowledge and industrial experience.
Get in tour with Steffen Raach to make your request.

Related Services

Owners Engineering

We make our experience from various engineering projects, as well as high-level European research projects like H2020-LIFES50+ your benefit. Our knowledge of critical loading conditions, controller tuning and modeling approaches helps to identify possible shortcomings

Read More »

Lidar control controller design

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea

Read More »

Lidar control integrated design

Taking lidar control in the design process of tower, blades, or other components into account enlarges the potential of lidar for wind turbines. With integrated design projects the team of sowento can showcase and support

Read More »

Lidar data processing service

Over the last decade we have been involved in the development of lidar use cases in wind energy. Though the leading role in the IEA Wind Task 32 and our research activities at University of

Read More »

Lidar control field-testing support

sowento will accompany the client in the field testing phase of lidar assisted control. This ensures the the achievement and the validity of the testing objectives and avoids a failure during the testing. Engineers of

Read More »

Integrated Design and Optimization

The novel floating wind technology is progressing continuously along the learning curve. With our efficient reduced-order system simulation toolbox, we are able to represent efficiently the overall system dynamics for all types of substructures. We

Read More »

Book a meeting

We provide a range of wind energy consultancy services, let’s discuss your project request. 

We will then connect you with our experts to go ahead.

1-on-1 meeting with Steffen

"I am happy to schedule a meeting with you to discuss your request."

Thank you!

Your message was successfully sent. You will hear from us shortly.