Fully instrumented turbine 04 in Nørrekær Enge

Cheaper wind turbine testing on its way

Tuesday 28 Nov 17
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Contact

Rozenn Wagner
Senior Researcher
DTU Wind Energy
+45 46 77 59 50

Project Overview and watch videos

Read more about UniTTe's project overview and watch the related videos.

Work package overview

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“The UniTTe project has been successfully executed and has achieved its goals to a very high degree. It has produced a great deal of important results directly related to the calibration of nacelle LIDARs and their application for performance verification, which is of great value to the wind industry” says Ioannis Antoniou, Senior Key Expert at Siemens Gamesa renewable Energy A/S

 

The UniTTe project has provided the opportunity for ZephIR Lidar to work once again with world-class researchers whose expertise covers all relevant areas. Supplements Michael Harris, MA, PhD and Chief Scientist from ZephIR Lidars.

The project UniTTe (Unified Turbine Testing) is finishing with unique and promising research results.
 
The researchers set out to develop a new and validated power curve measurement and load assessment method that can be used anywhere onshore and offshore.
Instead of using the commonly used meteorology masts (met masts) they installed a nacelle mounted lidar (laser anemometer) on the wind turbine to measure the wind upstream.
The advantage is that it is no longer necessary to measure the wind 300 or 400 away from the turbine rotor. Onshore, in complex terrain, it will not be necessary to assess the effect of the terrain on the approaching flow.

As offshore turbines grow bigger, the standard power performance verification method soon requires measuring the wind more than 500m away from the turbine that is beyond the capacities of existing nacelle mounted lidars as their laser power is limited by eye safety regulation.

From a research point of view, the researchers have reached all the objectives that they originally set out to do.
They have developed a new and validated method that can be used anywhere in the world in complex terrain as well as offshore.

The free wind speed is estimated from measurements taken close to the wind turbine – only 50-100 metres, thanks to a simple induction model. Even for very large offshore turbines, this is in reach of current nacelle lidar technology. In complex terrain, site calibration, accounting for the effect of the terrain on the flow, will no longer be necessary.

Furthermore, turbulence measurements from nacelle lidars have shown to be equivalent to measurements from traditional anemometers for loads assessment purposes. Wind power performance verification and loads assessment will be easy and cheaper to make both onshore and offshore by using those techniques with nacelle lidars instead of met masts.
 
The researchers have demonstrated and tested the new procedure in three different full-scale campaigns, among others in complex terrain in Hill of Towie, Scotland.

The results means that UniTTe is delivering the scientific basis for the next generation of international power and load standards and they started the process of creating a new IEC standard (IEC 61400-50-3)in October 2017. During the next three years, the IEC standard will be developed and implemented.

In collaboration with the wind industry, they need to take the new results to the next level for industry to get more confident with the new technology and implement it.

There is positive voices from the industry, as Ioannis Antoniou, Senior Key Expert at Siemens Gamesa renewable Energy A/S says:
“The UniTTe project has been successfully executed and has achieved its goals to a very high degree. It has produced a great deal of important results directly related to the calibration of nacelle LIDARs and their application for performance verification, which is of great value to the wind industry. The results will certainly also contribute to the work initiated within the IEC standardization task (IEC 61400-50-3). I hope and expect the UniTTe project success will help trigger more nacelle LIDAR relevant projects”.

Michael Harris MA PhD and Chief Scientist from ZephIR Lidars supplements by saying:
“As a Lidar manufacturer, it’s important for us to relate our unique rotor-scanning nacelle-mounted lidar measurements to customers’ specific needs. The UniTTe project has provided the opportunity for ZephIR Lidar to work once again with world-class researchers whose expertise covers all relevant areas. Demonstrations of the calibration and accuracy of ZephIR turbine lidars, in projects such as UniTTe, can only increase industry acceptance and access to the important benefits that can be offered over traditional turbine performance assessment with cups and sonics.”

Publication overview

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