Nacelle-mounted ZephIR Lidar Passes DNV-GL Verification
An independent performance verification of a nacelle-mounted ZephIR Lidar has been undertaken by DNV GL on the test site in Janneby, Germany which demonstrates the product is compliant with best-practice guidelines developed in the EUDP UniTTe programs – widely regarded and accepted as industry benchmarks for installations of turbine-mounted Remote Sensing Devices (RSDs).
- Verification of inclinometers. ZephIR DM uses highly sensitive positional sensors to account for turbine sway and nod to ensure a true Hub Height measurement is reported at several rotor diameters in front of the turbine within +/- 1% of Hub Height.
- Availability. ZephIR DM achieved a 100% availability of both system and data during the performance verification. A Continuous Wave lidar, all power from the system’s laser is focused at each measurement range, which helps to ensure the highest levels of sensitivity and therefore data availability, in all environmental conditions.
- Wind speed comparison. White box test results are shown below where a correlation gradient of 1.00026 was achieved, i.e. a 0.026% difference between the lidar line-of-sight and mast wind speeds were observed:
- Power Curve Measurements,
- Turbine trouble-shooting including yaw alignment studies and Nacelle Transfer Function optimization – see opposite, ZephIR DM deployed on Lincs Wind Farm with Centrica Energy
- Turbine End of Warranty Inspections