Synchronous Turbo-Generator Model Accounting for Rotor Whirl

This paper presents a detail dynamic model of synchronous turbo-generator capable to take into account for rotor whirl. The model is based on a modified winding function approach that allows exact description of machine windings space distribution. Rotor whirl modeling is based on axial slicing of the machine and summing up on such way obtained winding inductances. On such manner, very complex 3D phenomenon could be reduced to the simpler 2D problem. The effect of rotor whirl on the stator and rotor currents is examined. It is demonstrated that as a result of rotor whirling big circulating currents in parallel paths of stator winding could arise. The numerical model is based on the data of real synchronous turbogenerator TBB-200-2A rated at 247 MVA.