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Hi,This python code of yours can be used normally in the savnw .sav that comes with PSSE, but can your python script calculate the inertia of the new energy power system containing wind farms? I still use your New energy power systems with wind farms（ieee39RE.sav and ieee39RE.snp） to calculate the system inertia, but the results are shown as follows after operation：

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

Inertialess Machine model found:GENTPJU1

 Bus   ID   MacInertia  TotalInertia

System Inertia: 0.00 GW-sec

Please how can I get the correct system inertia,？I would be very grateful if you could reply！