Why do wind turbines shut down in high winds?

Here we have a look at why wind turbines have to shut down in high winds, debunking a couple of misconceptions.
You can try Ashes for free here: www.simis.io
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[@yizasrikanthreddy4320]

Hello. it seems to be very interesting. May I know what could be the control logic used during high wind speeds

[@AshesWindTurbineSimulation]

I'm not sure I understand the question... The blades are pitched to an angle where they produce very litle torque, so that the rotor does not rotate anymore (or rather rotates very slowly). Does that answer your question?

[@yizasrikanthreddy4320]

@@AshesWindTurbineSimulation I mean what logic are you following to design pi controller in the above the cutout speed.

[@AshesWindTurbineSimulation]

@@yizasrikanthreddy4320 Right! We don't design controllers, we are just developing the software Ashes. But maybe if some control engineer reads this they can answer?

[@Iamsuccesspro]

Do blade angles adjust with speed in your demo?

[@AshesWindTurbineSimulation]

You mean whether the blades are pitching? Yes they are, you can see the value in the Control pane at the bottom of the screen

[@johnblack4318]

Why can't turbine blades be designed to be 'feathered' ( as in aeroplane propellors)? The pitch could be altered manually or by wind speed sensors.

[@AshesWindTurbineSimulation]

A big difference between airplane wings and wind turbine blades is that wind turbine blades are rotating, which means that they experience both the incoming air flow (due to the wind) and what we call a rotational wind velocity due to their motion through the air. The sum of the two is the relative wind. As you can imagine, the further along the blade, the higher the speed of the blade through the air and thus the higher the relative wind. That is why the blades cannot be ‘flat’ as for airplanes but need what we call a twist angle that varies along the blade, to face the relative wind best.
And if the blades were feathered, they would not be aligned with the relative wind.
This video is relevant: czcams.com/video/OOP6Mbn0Gbw/video.html

[@johnblack4318]

@@AshesWindTurbineSimulation So why can't the turbine mechanism be designed to swivel andface the oncoming wind???

[@AshesWindTurbineSimulation]

@@johnblack4318 Right, do you mean turning the whole rotor so that it faces the wind (rather than individual blades)? Yes, that is done, it's called yawing the turbine. Feel free to download Ashes (www.simis.io) and give all that a try

[@paulthomassen2184]

All (arguably) utility size wind turbines can be feathered and they are feathered when the control system decides to shut down due to too high winds (showing how a wind turbine shuts doen should probably have been a part of this vid). Usually, though, a wind turbine that is shut down is idling, i.e. it is (still) rotating, but very slowly. This can be quite easily simulated in Ashes using the IEA 15MW reference turbine (that ships with Ashes) and its ROSCO controller (that also ships with Ashes). However, you do have to manually change the input file for ROSCO to shut-down mode. If you do that, the wind turbine will start shutting down when the pitch is at approximately 22 degrees and increase the pitch to approximately 90 degrees. We will probably make a vid soon show exactly this - so, like, subscribe and press the bell ;-)

[@mohamedalaa1156]

what is the name of this program pls ?

[@AshesWindTurbineSimulation]

It's called Ashes, you can find a link in the description to download it