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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Remote sensing: From toys to tools?' taking place on Wednesday, 12 March 2014 at 14:15-15:45. The meet-the-authors will take place in the poster area.

Jordi Armet Unzeta Alstom renovables España S.L, Spain
Co-authors:
Jordi Armet Unzeta (1) F P Victor Ramirez Rivas (1) Ignasi Simon Torrens (1) Alex Meilan Moñiz (1)
(1) Alstom renovables España S.L, Barcelona, Spain

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited

Mr. Armet has performed his professional career in the wind industry over a period of 8 years. At this moment he works as a senior measurement engineer in the Innovation department of Alstom Renovables España.
He studied Physics and Meteorology at University of Barcelona. After that, he worked in the wind industry in different domains such as weather forecast, wind resource, electrical market and wind turbine performance. Since 2 years he is working in Alstom carrying out the coordination and analysis of certification campaigns for wind turbine prototypes. His research is focused on CFD simulations and wind sensor measurements.

Abstract

Haliade 150 (6MW). Power curve measurement according CD IEC61400-12-1 (new edition). Ground-based lidar applications for big rotor diameters

Introduction

The wind industry community is focused on LIDAR measurements due to their inclusion in the CD IEC 61400-12-1 ed.2 and the possibility to measure the wind over hub height with low installation cost comparing with traditional meteorological mast.
This article is focused on a validation campaign of a commercial Ground based LIDAR and their applicability for future certification campaigns as well as their performance under different weather conditions.


Approach

Alstom Renovables España S.L has installed the first 6MW (HALIADE 150) offshore prototype wind turbine in an onshore site and taking this advantage a ground based LIDAR has been installed at same position as a hub height met mast installed for certification purposes. This has allowed us obtain an accurate physically synchronized data base between Wind turbine–Met mast–LIDAR making us possible the data analysis at a high sampling rate.

Main body of abstract

Using the data acquired from the LIDAR and the rest of the equipment available for certification purposes, the following studies have been performed:
- LIDAR verification tests
This article goes deeply in pulsed ground based LIDAR performance correlating data of met mast and LIDAR at 1Hz sampling rate and at 10-min statistic.
- Wind turbine power performance
The study has followed the IEC-61400-12-1 method (based on hub height wind speed) and CD IEC-61400-12-1 ed. 2 (wind speed equivalent method). Resulting power curves have been compared in different wind shear situations including the impact in the statistic uncertainty linked to LIDAR measurements
- LIDAR measurement under non-homogenous flow
The wind under wake effect (coming from the wind turbine) has been taken to simulate a non-homogeneous flow situation and test the LIDAR performance in comparison to cup anemometer. It has allowed analyse the underestimation and overestimation effects depending the number of beams under the wind turbine wake.

- LIDAR availability according to weather conditions
The weather characteristics of the site and the rain sensors installed in the met mast has allow a deep analysis of the LIDAR performance under rainy conditions and their impact on the LIDAR availability.


Conclusion

The correlations have been satisfactory (deviations below 1%) of all evaluated variables either in 1Hz sampling rate and 10-min statistics data. As regards the availability, the values have been very close to 98% for all data and near 95% taking only the data under rainy conditions in the range near hub height.
Thanks to site characteristics, 180º surrounded by the Loire River (low roughness) and the rest 180º by fields with some trees (medium roughness), different shear conditions has been collected allowing to study their impact in the power performance following the CD IEC-61400-1ed.2 in comparison to the current version.



Learning objectives
This campaign has allowed to test the LIDAR CAN-Bus interface and observe how it is capable to be synchronized with other systems for certification purposes.
The results obtained during the validation campaign has been satisfactory and the data availability under rainy periods good enough to could take the ground-based LIDAR into account for future certification campaigns.