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I'm documenting @cajief's comment here for anyone else coming along.

1.) Number of iterations to solve

psspy.iterat - The number of iterations used in the last solution attempt

num_iterations = psspy.iterat()

2.) Largest MVAR/MW mismatch

psspy.maxmsm - Complex bus mismatch at the bus with largets MVA mismatch
psspy.sysmsm - Return the total system MVA mismatch

ierr, bus, mismatch = psspy.maxmsm()
print mismatch.real, mismatch.imag   # MW, MVAR

mva = psspy.sysmsm()

3.) Individual iteration largest change - P,Q,V,A as reported in progress window

No known API

@AdamF you have the right approach here. Redirect and parse the output if you need that information. I haven't seen an API to do this. If you write some code that does it, I'd love to see it in action!

I'm documenting @cajief's comment here for anyone else coming along.

1.) Number of iterations to solve

psspy.iterat - The number of iterations used in the last solution attempt

num_iterations = psspy.iterat()

2.) Largest MVAR/MW mismatch

psspy.maxmsm - Complex bus mismatch at the bus with largets largest MVA mismatch
psspy.sysmsm - Return the total system MVA mismatch

ierr, bus, mismatch = psspy.maxmsm()
print mismatch.real, mismatch.imag   # MW, MVAR

mva = psspy.sysmsm()

3.) Individual iteration largest change - P,Q,V,A as reported in progress window

No known API

@AdamF you have the right approach here. Redirect and parse the output if you need that information. I haven't seen an API to do this. If you write some code that does it, I'd love to see it in action!