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Hi I ran IEEE 39-bus model for 50 seconds flat-run simulation in PSSE v.35. simulation time step was set to 4.16 ms. I used IEEE39_v33.sav and IEEE39.dyr files. all parameters including P,Q,V, F are stable and constant. the only issue is that rotor angle of the generators decelerate around 0.25 deg( or less) during 50 second of the flat-run simulation. Also Pm is not equal to Pelec in generators. considering this fact, is this model proper for dynamic study of large load( data center) interconnection? how much rotor angle change during 50 sec flat run is acceptable? how can I resolve this? I would appreciate any help