Choosing the right element as torque input

reza hakimi_20486

Hello

In this circuit, I intend to rotate the bldc generator shaft with the desired values

For this purpose, I used the element in the picture, which is a load with an external controller.

The torque on the shaft reaches the desired values, but the speed of the shaft becomes extremely unstable and fluctuating. What is the solution to this problem or what other element can I use?

Thanks

Albert_Dunford

Hi Reza,

 

This looks slightly complex, there is a wind turbine model that you might find is better suited to the job and many examples about how to use it. The wind turbine model take wind speed and pitch as inputs and uses this power equation to define the output power. 

 

These examples are in the examples/renewable energy/wind power folder.

in your system it looks like you have an extra coupling element likely because you didn't set the master slave flags properly.

 

I hate to say read the manual, but it has a very comprehensive description of the master slave flag settings for mechanical power transfer. Section 4.6.1 Reference Direction of Mechanical Systems. Access it through help->documents. If you aren't careful with the master slave flags, you'll end up with the wrong sign convention for your torque I assume you are doing dq control for this active rectifer, you'll endup with the wrong sign for your "Iq" to push power from your prime mover to your electrical load.

 

Also, this tutorial video on the mechanical electrical interface might be helpful

Along with this webinar on complex mechanical loads

 

 

reza hakimi_20486

Albert Dunford_20896 said:

Hi Reza,

 

This looks slightly complex, there is a wind turbine model that you might find is better suited to the job and many examples about how to use it. The wind turbine model take wind speed and pitch as inputs and uses this power equation to define the output power. 

 

These examples are in the examples/renewable energy/wind power folder.

in your system it looks like you have an extra coupling element likely because you didn't set the master slave flags properly.

 

I hate to say read the manual, but it has a very comprehensive description of the master slave flag settings for mechanical power transfer. Section 4.6.1 Reference Direction of Mechanical Systems. Access it through help->documents. If you aren't careful with the master slave flags, you'll end up with the wrong sign convention for your torque I assume you are doing dq control for this active rectifer, you'll endup with the wrong sign for your "Iq" to push power from your prime mover to your electrical load.

 

Also, this tutorial video on the mechanical electrical interface might be helpful

Along with this webinar on complex mechanical loads

 

 

Hello again

In this wind turbine model that you introduced, how is the radius of the blades entered?

And another question, what is the role of zener diode in this circuit?