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Turbine Mounted Wind Lidar

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Performance stability of ZephIR in high motion environments: Floating and turbine mounted
M Pitter et al (2014)
This paper demonstrates by simulations, controlled experimental studies and the results of field deployments that the effect of motion on ZephIR performance is insignificant and easily compensated, largely due to the high-resolution, fast data rates and multiple viewing angles enabled by the very high carrier to noise ratio unique to continuous wave wind lidars, such as ZephIR. Stability of ZephIR performance is therefore confirmed for cases where lidar is subject to extreme motion, namely mounted on a floating offshore platform or on a wind turbine nacelle.

Project Cyclops: the way forward in power curve measurements?
S Feeney et al, EWEA (2014)
A ZephIR DM lidar was mounted on the nacelle of a large turbine, adjacent to a fixed mast and a second ground-based vertically profiling ZephIR DM. The wind speed and turbine power curve measurements from both ZDM lidars were in very close agreement with each other and with the reference mast, showing very little bias or scatter.

The impact of tilt and inflow angle on ground-based lidar wind measurements
M Mangat et al, EWEA (2014)
An investigation of ground-based ZephIR 300 units at the Pershore test site shows that the horizontal wind speed is negligibly affected by a static tilt of the lidar up to 10 degrees. The data are also used to demonstrate the accurate measurement of inflow angle by ZephIR 300.

Evaluation of wind flow with a nacelle-mounted continuous wave wind lidar
J Medley et al, EWEA (2014)
Measurements by a ZephIR DM lidar mounted on the nacelle of a test turbine at Riso DTU have been validated against a met mast, and have been used to derive a rotor-equivalent power curve in accordance with the latest draft of the IEC guidelines.

ZephIR Dual Mode
WindTech International (2013)
March 2013 saw the tenth anniversary of the first commercial lidar deployment for wind energy applications – and while it is now commonplace to see wind lidars (such as ZephIR 300 and those that followed) in wind energy resource assessments, it was actually a turbine-mounted application for which the ZephIR technology was first deployed.

Relative power curve measurements using turbine-mounted, continuous-wave lidar
C Slinger et al, EWEA (2013)
Nacelle-mounted lidar offers an exciting alternative to conventional methods for measurement of turbine power curves.



Additional Papers

Full-scale field test of a blade-integrated dual-telescope wind lidar
A T Pedersen et al, EWEA (2013)
The paper describes the first investigation in which lidar units are installed in the blades of a large wind turbine. The data showed potential for real-time evaluation of angle of attack, and the impact of shear was observed as the blade traces out the rotor disc.

Full two-dimensional rotor plane inflow measurements by a spinner-integrated wind lidar
M Sjöholm et al, EWEA (2013)
A modified ZephIR lidar was mounted in the spinner of a large turbine and incorporating a novel two-dimensional scanner. The data provide unprecedented detail of the incoming flow pattern, allowing investigation of phenomena such as wakes and natural turbulence.

Lidar wind speed measurements from a rotating spinner: “SpinnerEx 2009”
N Angelou et al, Riso Report (2010) Riso-R-1741(EN)
The feasibility of upwind observations via a spinner-mounted wind lidar was demonstrated for the first time during this experiment. A ZephIR lidar was installed in the rotating spinner of a MW-sized turbine for several months during 2009.

Light detection and ranging measurements of wake dynamics
Part I: F Bingol et al, Wind Energy 13 51-61 (2010)
Part II: J-J Trujillo et al, Wind Energy 14 61-75 (2011)
The experiment was conducted with a modified ZephIR to test the simple hypothesis that the wake deficit is advected passively by the larger-than-rotor-size eddies in the atmospheric flow, and that the wake at the same time widens gradually, primarily because of mixing caused by small-scale atmospheric eddies.

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