4

Wind-turbine wake models are used in the design of wind farms, to optimise the choice of turbine model, and the layout of the turbines. They're also sometimes used in the operation of wind farms, to maximise generation.

What is the evidence on the accuracy of the wind turbine wake models?

I'm primary interested in accuracy with specific regard to maximising windfarm profitability: that is to say, judging their accuracy from the perspective of their objectives when used in wind farm design and operation. If there aren't studies looking at their accuracy with regard to maximising generation at lowest cost, then some other measure of accuracy would be acceptable: at worst, something like root mean square error (as unsatisfactory as it is in this context).

  • 2
    Cringely had an interesting article on this back in May: cringely.com/2016/05/06/15262 – Paul Dubuc Sep 21 '16 at 21:19
  • You ask for a recent study - is there an older study? Looking at the author/institution or citations of the older study could lead to an updated version. – LShaver Feb 4 '17 at 22:00
0

February 2018 comparison of two kinematic wake models and two actuator disc models

Simisiroglou, Polatidis, and Ivanell compared these four models to data from Lillgrund offshore wind farm in Sweden in their paper "Wind farm power production assessment: a comparative analysis of two actuator disc methods and two analytical wake models". Here's one of various graphs showing the results:

enter image description here

All four models are reasonable for the second turbine in the wake. Further down the row, the newer actuator disc (ACD) and Larsen models are the most accurate.

For reference, in the the actuator disc models:

the rotor is represented by a permeable disk that allows the flow to pass through the rotor, at the same time as it is subject to the influence of the surface forces.

March 2017 comparison of three kinematic wake models

Seim, Gravdahl, and Adaramola compared three kinematic wake models to data from a wind farm in Norway in their 2017 paper "Validation of kinematic wind turbine wake models in complex terrain using actual windfarm production data".

The article is behind a paywall, but some of the results are indicated in the abstract, confirming the accuracy of the Larsen model:

[T]he accuracy of the Jensen-, Larsen- and Ishihara model are tested in eight single-wake cases with regard to several key aspects. [...] The Larsen model correlated well with the measured data regarding the normalized power deficit, while both the Jensen- and Ishihara model clearly overestimated the power deficit. At the wake centerline, the Larsen model was by far the most accurate, with a mean absolute error of 7%. The Jensen- and Ishihara model had a mean absolute error of 21% and 34% respectively. Both the Jensen- and Ishihara model agreed well with the observed wake width. The Larsen model widely overestimated the wake width in all cases, but with an almost constant offset. For the energy loss in the wake, the Larsen model performed best for the three investigated wake cases with a mean absolute error of 29%, although all the three wake models showed a varying performance with a tendency to underestimate the energy loss.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.