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Tuesday, 11 March 2014
11:15 - 12:45 Advanced rotor technologies
Hardware Technology  


Room: Tramuntana
Session description

The Rotor is the key item for development of wind turbines. This includes e.g. power curve / production, turbine loads, safety and noise. In this session three developers / manufactures will contribute their know-how on research, development and validation of the new developments, i.e. CFD and measurements. The session will be completed by an outlook for the future trends within the Rotor technologies.

Learning objectives

  • State-of-the-art rotor technologies
  • Outlook for future rotor technologies
Lead Session Chair:
Ole Kjær, DNV GL Renewables Certification, Denmark
Peter Bæk LM Wind Power, Denmark
Co-authors:
Claus Byskov (1) F P
(1) LM Wind Power, Kolding, Denmark

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Abstract

Wind field measurements using radio based sensor technology on wind turbine blades

Introduction

To enable more advanced control of the turbine performance a more advanced sensor technology is required. Common practice is to use the rotor speed and wind anemometer at the nacelle to measure the wind speed, but these are subject to large uncertainty in either time or space. To optimize the performance of the turbine, both in regards to increasing power output, and reducing loads, a more complete wind field measurement is required.

Approach

LM announced in May 2013, that we have joined project to develop intelligent blades based on wireless technology in collaboration with global leading radio propagation and antenna specialists at Aalborg University, DK and funded by the Danish National Advanced Technology Foundation.

This project has commenced and wind and radio technology specialists are now collaborated to explore how cutting edge radio technology can be exploited measure wind field and blade loading.


Main body of abstract

The project aims to develop a wireless sensor technology that will address simultaneously both blade deflection, blade loading, and wind field measurement. The goal is to develop technology that from both a functional performance and cost perspective will outperform the optical strain measurement sensors, as well as LIDAR technology that are currently available.

A proof of concept of the radio based sensor technology was made in the summer of 2013. A wind turbine was fitted with radio technology on the blades, giving signals related to the deflection of the blade. These signals were transformed via knowledge of the blade geometry and aerodynamics into an instantaneous picture of the wind field and blade loading. The wind field could resolve wind shear, yaw misalignment and high turbulence regions in the rotor. The measured blade loading and wind field was compared to aero-elastic simulations. The test setup proved feasibility of the sensor technologies and the technical issues still to be resolved.


Conclusion

The proof of concept showed feasibility of the new sensor technology, which measured high resolution blade loading and wind field data. The wind field data can be used on the turbine control system for optimization of the turbine and wind farm performance, and in the long run lead to more efficient wind turbines, which will make wind power reach grid parity.


Learning objectives
The intension is to give insight in the challenges and benefits of having wind field sensor systems. Furthermore to illustrate the fruitful collaboration of two unmatched technology fields, radio propagation and blade design.