| Abstract |
A closed analytical description of the AC supplied traction drive input circuit, including model of the
single phase, multi-winding traction transformer and a model of the line side 4 quadrant converter is
presented. The main attention is directed to the mathematical model of the multi-winding traction
transformer. The polygon network model of the “N” windings traction transformer is based on
0.5*(N-1)*N short circuit impedance measurements. The short circuit impedance is represented as a
serial connection of frequency dependent resistors and frequency dependent inductors. The described
transformer model is limited to the frequency range applied in short circuit measurements. The
presented method, applied by the author, increases the accuracy of traction converter input circuit and
harmonic filter dimensioning, allows for more exact calculation of current distortion and line
converter components stresses. |
