Modeling of an alternator using Stand Still Frequency Response Test

This paper proposes an equivalent circuit model of an alternator in d- and q-axes, and a Standstill Frequency-Response (SSFR) Test is employed to estimate model parameters. Unlike a conventional model, damper windings are introduced to represent the solid claw-pole rotor structure. The rotor saliency effect is also taken into account. Starting from a simpler model with one damper winding in d-axis and one damper winding in q-axis, several models are fitted using Levenberg-Marquadt method with weightings. Finally, a model with two damper windings in d-axis and two damper windings in q-axis was found to be the best fit model for the selected alternator.