Wind Speed Estimator in ROSCO

[mohsamaz]

Dear Nikhar,
I have a question regarding your paper titled "A Reference Open-Source Controller for Fixed and Floating Offshore Wind Turbine."

In Figure 6 of the paper, you show a wind speed estimator. However, it appears that the wind speed used in this figure is not real but rather generated with an average of 11 m/s. In contrast, real wind turbine operations would involve actual wind speed measurements with significantly more fluctuation.

Could you please explain this? Specifically, was the wind speed estimator shown in Figure 6 based on idealized conditions, and how does it compare to real-world scenarios where fluctuating wind speeds are present?

Does wind speed stimator implemented in FORTRAN?
Is it possible to design a new wind speed stimator with python?

[dzalkind]

Hi,

Figure 6 shows the wind speed estimate compared to the rotor averaged wind speed. The rotor average wind speed will smooth the signal, compared to a single point measurement in space. The rotor average wind speed was calculated from a full-field turbulence generated using TurbSim. I don't know the exact parameters used to generate the file, but I'm sure you could reproduce that figure with your own configuration.

The wind speed estimator was implemented in Fortran here: https://github.com/NREL/ROSCO/blob/122c75864c1c0c1a828975180f46e77220771e60/rosco/controller/src/ControllerBlocks.f90#L187

I'm sure it's possible to design a wind speed estimator in python.

Best, Dan

[mohsamaz]

Hi everyone,

Thank you @dzalkind for your earlier response!

I’m curious about the use of a wind speed estimator. What is the primary reason for using one? When a turbine operates under real conditions, wind speeds can vary widely, ranging from 0 to 20 m/s. How does such an estimator perform under these varying real-world conditions?

Additionally, I’m interested in designing a custom wind speed estimator in Python and replacing the existing estimators in ROSCO. Could anyone provide insights or guidance on how to approach this?

Thank you in advance for your help!

Best regards,

[dzalkind]

Wind speed estimators are used because point measurements, like an anemometer on the nacelle, are noisy and can have interference.

The wind speed estimator should work under varying real world conditions.

I would conduct a literature review and review existing implementations, like the one I provided, and implement the estimator in python with some kind of turbine model. The ROSCO toolbox has a simple simulator that is demonstrated here: https://github.com/NREL/ROSCO/blob/122c75864c1c0c1a828975180f46e77220771e60/Examples/04_simple_sim.py#L24