The use of recursive least square to determine the model parameters of a transformer in different frequencies

This paper presents an alternative approach for determining the parameters of single-phase two-winding transformer. The dynamic parameters of a transformer, including its inductances and resistances are estimated by the application of recursive least squares algorithm on the measured data taken from the terminal voltage and current. The results show that the resistances increase and the inductances decrease with the elevation of the frequency. The model properly represents the characteristics of the original transformer. The accuracy of the results is also verified by simulation tests.