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Use the following line:

psspy.set_NaN_python()

Immediately after psspy.psseinit(150000).

This is assuming you have psspy psspy imported and PSSE psse initialized. I ran into the exact same issues. FYI, you can import and use dyntools without psspy, which would also help. If you aren't doing this, then I'll need some more info to help..

Hope this helps; sorry for the late reply.

Use the following line:

psspy.set_NaN_python()

Immediately after psspy.psseinit(150000).

This is assuming you have psspy imported and psse initialized. I ran into the exact same issues. FYI, you can import and use dyntools without psspy.initialized.

Hope this helps; sorry for the late reply.