When I increase the simulation time from 2sec to 8sec or 10sec, why the response of PMSG (Permanent Magnet Synchronous Machine) change?

I am currently using a permanent-magnet synchronous machine as a generator in my wind turbine model in simulink. The model works very good when the simulation time between 2-4sec, but when I increase the simulation time to 8sec or more. The output values of the generator like stator currents, the speed and torque will change. I don't know why???

Is there anyone who has worked with the PM machine in Simulink, especially making it work as a generator with a Torque input. I really appreciate the help :)

Thanks, Raed

[@Johannes]

Hi Raed,

is it possible to upload the model?

Best regards,

Johannes

[Raed Ibrahim]

Hi @Johannes,

Send me your email I will send it to you.

Best regards, Raed

[paranandi lakshmi narayana]

sir i am also facing with the same problem my turbine is variable speed wind turbine if i connect pmsg the output is totally changed if pmsg is nt connected the output is upto 12 secs if pmsg is connected the output is of 0.2 secs how can i solve this

[paranandi lakshmi narayana]

[e-mail] this is my mail please provide the solution sir

[paranandi lakshmi narayana]

sir i had tried this mdel but still the output response is almost 0.2 secs only sir if you have mail i.d please give it to me sir i will send you my model i am facing a big prblem only with this.thanking you please help me

Answer 1

[Ahmed Al-Toma]

1. Inpt Torque should be negative to PMSG work as a Generatot. 2. The control circuit may be incorrect. So the saturation may happen for 8 seconds.

[Raed Ibrahim]

Thanks Ahmed Al-Toma for your answer, I used a negative torque. It is very simple model just a PMSG with a constant input. Best regards, Raed