Power System Damping Enhancement by Two-Axis Supplementary Control of Synchronous Generators

The addition of a properly controlled q-ais field winding on the rotor of a synchronous generator has been suggested before as an effective way of improving power systemn steady-state and transient stability limits. This paper explores, on the other hand, an additicnal and very important feature of such a winding; that is its capability of enhancing power system damping and hence suppression of mdesirable sustained oscillations experienced in power networks.