Scanning LiDAR

Wake Effects and Wind Resource

The wakes and wind resource research area investigates the potential to reduce costs in wind resource assessments and to optimise output through increasing understanding of wake effects

The wakes and wind resource research area investigates the potential to reduce costs in wind resource assessments and to optimise output through increasing understanding of wake effects. The research also extends to better understanding the behaviour of wakes across the wind farm and improving modelling techniques and whole energy assessments. At the centre of the research is the goal to reduce the uncertainty of wake losses and wind resource assessments, improving the bankability of projects.

Research to date has accelerated the move to LiDAR technologies from met masts, validated new wake models and optimised layouts. Of particular note has been the pioneering floating LiDAR roadmap which is now recognised as the industry standard definition for floating LiDAR devices. The OWA has also funded and managed several ground breaking campaigns offshore, including deployment of floating LiDAR and new scanning LiDAR devices.

 

Analysis of ANSYS WindModeller wake software

OWA measurement campaign at Rødsand II

In 2013, the OWA launched a measurement campaign at the Rødsand II wind farm. The £2m wake effects measurement project has provided detailed measurement data to the wind industry to help better understand how the wind behaves in complex situations offshore. This data is currently being analysed in order to help the industry improve prediction accuracy, reduce financing costs and optimise windfarm layouts.

Image: Analysis of ANSYS WindModeller wake software

Roadmap for commercial acceptance of floating LiDAR and Floating LiDAR recommended practices

The Carbon Trust Offshore Wind Accelerator has published a roadmap for commercial acceptance of floating LIDAR technology. This document explains how measurement uncertainties decrease as a floating LIDAR device moves from Stage 1 (baseline) through to Stage 2 (pre-commercial) and finally Stage 3 (commercial).

The OWA has also published its Floating LiDAR Recommended Practice report which builds on work initially undertaken as part of the IEA Task 32 workforce and sets out key parameters and issues to consider when deploying floating LiDAR devices, both during validation and in commercial campaigns

The development of the 'OWA Recommended Practices for Floating LiDAR systems' was a fundamental milestone for the total acceptance of this technology to measure bankable wind conditions in the offshore environment

Javier Rodriguez Ruiz- Iberdrola

Floating LiDAR validation campaigns

The OWA Wakes and Wind Resource working group has also funded validation campaigns for several floating LiDAR devices.

During the four year trial a range of floating LiDAR devices were deployed alongside existing offshore met-masts to enable the comparison of wind speed and direction measurements. Over the course of the campaign five systems were tested at six different sites across Europe:

  • Babcock at Gwynt y Mor;
  • FLiDAR at Gwynt y Mor, Narec (now ORE Catapult Blyth), and Neart na Gaoithe;
  • EOLOS FLS200 at IJmuiden Met Mast;
  • Fugro Oceanor Seawatch Floating LiDAR at East Anglia ONE; and
  • Fraunhofer IWES Wind LiDAR Buoy at FINO1 Met Mast.


Following the trials, many of the devices tested are now being deployed by offshore wind farm developers in commercial campaigns.

Installation of scanning LiDAR device in Dublin bay

Installation of scanning LiDAR device in Dublin bay

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