Fem Identification of d-q Saturation Functions in Salient-Pole Synchronous Machines

The paper deals with the definition of functions that, applied to the operating quantities of the unsaturated synchronous machine model, allow to take into account the core saturation. In the analysis, referred to salient-pole machines, two p.u. saturation functions are defined and investigated, related to d and q axis respectively, able to model also the main d-q cross-coupling effects. The identification of the functions is carried out by means of selected FEM simulations. The saturation functions are suited both for field analysis purposes and for classical equivalent circuit studies.