101.plecs (213 KB)

# I got error :"Derivative is infinite or NaN" when i put my parameter in synchronous generator model.

The issue is that you have defined the Q axis damper leakage inductance (Llkq’) as zero. The model uses a 1/Llkq’ factor internally, resulting in the infinite derivative you’re observing.

As suggested in the past, if you don’t have a Q axis damper winding then set Llkq’=inf and Rkq’=0. This will eliminate the error message.

Note that because you have a very large resistance (1e10) across the breaker, you may notice some numerical issues in the voltage when the breaker is open. I suggest you remove the large resistance and change the machine’s Model parameter to “Stator VBR” or “Full VBR”.

thanks you so much ; )