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Standards Development
The purpose of the proposed technical specification is to provide general requirements and guidelines to ensure that scanning Doppler Lidar wind measurements meet the level of quality and reliability required for each use case.
This technical specification includes use cases such as pre-construction wind resource assessment and site suitability assessment, with a primary focus on wind measurements with scanning Doppler Lidar.
The technical specification includes guidance on:
- Lidar technology requirements
- Calibration and classification process
- Calculation of intermediate measurement uncertainty
- Lidar installation
- Data filtering and analysis
- Calculation of final measurement uncertainty
- Reporting format
The main challenge is to define requirements specific enough to ensure measurement consistency, repeatability and accuracy.
This proposal is not limited to onshore-to-offshore method, and includes all offshore and onshore cases in its scope. However, since it may not be applicable on onshore, the applicable conditions are described in the text.
The existing IEC61400-50 series describes wind speed measurements using meteorological mast and remote sensing devices (RSD) such as Doppler Lidar, as shown below.
- IEC 61400-50-1 deals with guidance for meteorological mast measurements.
- IEC 61400-50-2 provides guidance for ground-based RSD measurements.
- IEC 61400-50-3 deals with guidance on the use of nacelle-mounted Lidar.
- IEC 61400-50-4 deals with guidance on the use of floating Lidars.
On the other hand, in the development of offshore wind farms with relatively short offshore distances, there is a need to accurately evaluate offshore wind speed and turbulence intensity for resource and site suitability assessments, especially in areas with complicated coastal topography. Recent studies have shown that onshore installed scanning Doppler Lidar(s) can measure offshore wind speed accurately. It has been also shown that turbulence can be measured by using multiple scanning Doppler Lidars. These technologies have been used in some offshore projects and are expected to be widely deployed in future projects. Therefore, standardization of these technologies is required
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