Modeling of Transient Electrical Torques in Solid Iron Rotor Turbogenerators

It has previously been shown that it is necessary to employ a synchronous machine representation with unequal mutual reactances in the direct axis in order to calculate accurately the transient field current. This paper shows that if the stator current is calculated accurately by a synchronous machine model then the instantaneous electromagnetic torque is also accurately predicted. It is further shown that this may be accomplished by a model with two rotor windings in each axis and without representation of unequal mutual reactances. Results are presented to demonstrate the degree of accuracy possible with this model.