Magnetic Saturation in Synchronous Generator Dynamic Models for Power System Stability Studies

This article analyzes and compares the magnetic saturations of the synchronous generator dynamic models commonly used for power system stability studies. A simple saturation method suitable for both round-rotor and salient-pole synchronous generators is introduced and evaluated for high accuracy generator dynamic models. Feasibility of applying a single saturation factor to both d- and q-axis in determining the generator rotor angle is studied from field measurement data. The accuracy improvement of using saturated stator parameter to calculate rotor angle is demonstrated based on calculation and field measurement results on in-service round-rotor and salient-pole generators with a variety of capacities. The suitability of the saturation method for a proposed GENQSC model has been proved.