Wind Turbine Transient
 

Hi all,

I am traying to simulate the transient behaivour of a wind turbine from 0 rpm to operations ones (72 rpm). I want to take into account the torque produce by the blades in order to estimate the rotational speed at the end of each timestep usin the ecuation

Wend=((Torque*DeltaT)/inercia momentun)+Wstart

I have a problem when I want to assign the Wstart, because and the begining I know that its value is 0, but at the end of each timestep, I need to assign the previus Wend to the new Wstart, in order to estimate the new Wend and so on.

I am using cell expressions to define this, but I do not know how to calculate the angular velocity of the previus timestep.

If anyone know how to do it, please let me know.

Thanks

Hi all,

My problem is I don't know exactly how CEL works. Are the expressions evaluated at the end of each timestep or at the begining?, I did the tutorial of FSI, and I understood that the cel expressions are evaluated at the begining, then according with the results are set the boundary conditions to the next timestep.

With this in mind, I wanted to set the new rotation velocity to my turbine for each timestep, using the previus rotation velocity, and I want to calculate this velocity with.

areAve(Rotation Velocity)@tip blade / Tip Radius.

I used the velocity calculated with this equation with a steady state run, with the rotor rotating at 72 rpm and they have almost the same value. But when I try to use it in the transient run, it calculate a diferent velocity with not physical sense.

Could anyone explain to me how the CEL expression works.

Thanks

I believe the best way to test wind turbines is spin them at various fixed rates, then measure the torque. Power = torque * rps. This will let you find the peak power point of your turbine and will help you know what kind of generator / alternator to put on it.

Hi hansel.

You are right, the best way to study wind turbines is simulating steady states at diferents spin velocity, but I am studying the transient of a small wind turbine from 0 rpm to operational velocity with constant wind speed. That is why, i need to take into account the inertia of the rotor, the torque generated by the wind and the torque used by the generator.

Thanks

Hi hansel.

You are right, the best way to study wind turbines is simulating steady states at diferents spin velocity, but I am studying the transient of a small wind turbine from 0 rpm to operational velocity with constant wind speed. That is why, i need to take into account the inertia of the rotor, the torque generated by the wind and the torque used by the generator.

Thanks

Ah I understand. I have considered doing the same thing to see if a VAWT will self start. Unfortunately, I have no idea how to do that.