Transient equivalent circuit of the divided-winding-rotor synchronous machine

A divided-winding-rotor synchronous generator has been proposed by Soper and Fagg. The proposed machine shows considerable improvement in leading-power-factor stability performance, both steady-state and transient, over a conventional machine. As opposed to the very detailed simulation results presented by Soper and Fagg, the present brief paper shows that the machine is nonsalient for transient changes and may be represented by a constant voltage behind a transient reactance. This gives a simple understanding of its performance compared with a conventional machine which shows a large degree of transient saliency.