A GENERALIZED-MODEL OF SATURATED SYNCHRONOUS MACHINES

Much effort has recently been devoted to improvement in predicting the steady-state and transient performance of synchronous machines based on proper account being taken of the iron saturation effects. Using th e physics of saliency and saturation, this paper develops an original general model for including the main-field magnetic saturation in the dynamic equations of the salient-pole synchronous machine. Although ar mature leakage saturation is neglected, the cross-saturation coupling is included. Also, frequency-dependent effects of eddy currents flowin g in solid parts are accounted for using a suitable number of rotor R- L loops in each axis network. Initial numerical results are presented, validating the model stability in simulations and assessing the impor tance of a proper account of saturation in the prediction of actual sh ort-circuit oscillograms recently recorded on a 370-MVA synchronous co ndenser.