Thread Subject:

permanent magnet synchronous generator steady ouput

Hello,

I'm trying to develop a wind energy system in simulink by using the pre-define permanent magnet synchronous generator. The wind turbine model I have model it myself, and although it gives me constant torque output, the generator output keeps increasing without stopping.

I've seen in some simulink examples I've found on the web that a feedback is used from the generator speed to the wind turbine generator speed. I did also try this but I got an unstable output again.

Does anyone have any suggestions?

thanks in advance.

On 6/4/2012 6:52 PM, Pamela wrote:
> Hello,
>
>I have model it myself, and although it gives me constant torque output,
>the generator output keeps increasing without stopping.
>

Just because the input is constant, does not mean the output will be constant?

What is the solution to y'(t)=1, y(0)=1 ?

It is y(t)=1+t

so the output keeps increasing with time, even though
the input is a constant 1.

> I've seen in some simulink examples I've found on the web that a
>feedback is used from the generator speed to the wind turbine generator speed.
>I did also try this but I got an unstable output again.
>
> Does anyone have any suggestions?
>
> thanks in advance.

Yes. The suggestion is to work on the model first before
you use simulation. i.e. use paper and pencil first.

First, write the plant model. Then decide on what you want
to control, then what controller you want based on what
run-time performance you want to achieve. You might also
think about if you want to use state space control methods
or classical frequency based methods.

Then you can go use simulation. Design the controller. test
the system. go back fix the design. try again.

If you are asking how to design a controller, then
People spend years on this one subject alone. Interesting
subject. But first you start with the plant model and
go from there.

--Nasser