Can you use wind lidar to provide quantitative data for the annual energy prediction (P50, P75 and P90) of a modern scale wind farm, allowing developers to raise the necessary finance to progress and construct full-scale developments?
The use of lidar should be considered in specific modes of applications with differing demands. These applications are summarised as onshore (benign site), Offshore (fixed platform), Onshore (complex site) and Offshore (floating platform)
The wind industry’s original wind lidar system, ZephIR, which has the longest operational track record of all commercially available lidar systems in this application is uniquely a continuous wave (CW) lidar. CW lidar offers specific advantages in all applications noted and this should be considered when purchasing a remote sensing device, such as lidar.
|Onshore: benign site||DNV GL considers ZephIR 300 to be at Stage 3 under “benign” conditions - accepted for use in bankable / finance-grade wind speed and energy assessments with either no or limited on-site met mast comparisons. In October 2012 ZephIR was the first commercial wind lidar system to achieve acceptance at this level.|
|Offshore: fixed platform||Under specific conditions advised and audited by DNV GL, it is anticipated that equivalent accuracy and uncertainty results would be obtained from an energy prediction based on data from ZephIR 300 mounted on a stationary platform as from an energy prediction based on data from a conventional offshore hub height met mast. Economic savings can also be realised in the area of offshore wind resource assessment in addition to overcoming practical challenges where met masts are not a viable option.|
|Onshore: complex site||Dynamics conversion factors applied are provided to the end user in full allowing for further wind analysis,
whilst also providing a clear audit trail for project financing and/or due diligence. This satisfies the requirements of FGW TR 6 standards and allows for the use of ZephIR 300 in a complex site.
|Offshore: floating platform||Fraunhofer IWES has recently successfully finished the validation of their Wind Lidar Buoy at FINO1 which confirms the commercial acceptance of wind data from the on-board ZephIR 300 lidar for use in floating offshore energy assessments, adhering to criteria within the Carbon Trust Offshore Wind Accelerator roadmap.|
Windpower Monthly Expert Report: Can the wind industry bank on wind lidar to deliver more accurate annual energy predictions?
DNV GL considers ZephIR 300 to be at Stage 3 under “benign” conditions – accepted for use in bankable / finance-grade wind speed and energy assessments with either no or limited on-site met mast comparisons. In October 2012 ZephIR was the first commercial wind lidar system to achieve accreditation at this level.
ZephIR 300 verified against IEC compliant Lelystad met mast – “The verification report shows that the uncertainty at all heights measured by ZephIR is low after comparing it with the IEC compliant TSL-MM02/03 met mast. Ecofys WTTS deems that the ZephIR 300 is suitable for field measurements as a replacement of cup anemometers in flat terrain.” Erik Holtslag, Ecofys WTTS Operational Manager. Visit www.ecofyswtts.com for more information.