The extraction of parameters for synchronous machines from the results of frequency response tests

Frequency response methods are becoming the standard means for the determination of the parameters of synchronous machines for transient stability studies. Existing methods of extracting the parameters for the equivalent circuits from the measured data tend to be rather arbitrary and have not produced the level of agreement with measured responses necessary for validation purposes. From the basic properties of cascaded L-R circuits, particular characteristics of the frequency response of has enabled a new set of relationships to be established. A new procedure for the determination of the time constants required to fit the frequency responses of the measured operational inductances of synchronous machines is therefore described