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.
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
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
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:
Following the trials, many of the devices tested are now being deployed by offshore wind farm developers in commercial campaigns.
The Wakes and Wind Resource technology working group supports any means by which the mapping of energy resource across potential sites can be improved. In the Remote Wind Measurements Project scanning LiDARs were deployed with scanning patterns designed to measure horizontal wind speed throughout a 58 km2 near shore offshore wind farm development area in Dublin Bay. Additionally, vertically scanning ground-based LiDARs were deployed to provide reference measurements enabling validation of the scanning LiDAR measurements. The project demonstrated the use of scanning LiDAR systems operating in single and dual Doppler at ranges up to 15km.
More details can be found in the project summary.
Installation of scanning LiDAR device in Dublin bay