Abstract
This paper presents a new method to express saturated magnetizing inductances of synchronous generators. In standard power system simulations, the saturation of main flux in synchronous generators is expressed in terms of variable magnetizing inductance as a function of magnetizing currents. This method, however, requires repeated calculations of many coefficients in machine equations at every time step of the simulation, because mathematical equations of the saturated synchronous machines contain many coefficients which consist of the magnetizing inductances. In this paper, auxiliary current to express the saturation is introduced and new model expressed in terms of the current is proposed. The new model contains only constant coefficients which are calculated from unsaturated values of the magnetizing inductances, and thus it improves the efficiency of the simulations.
