Time domain analysis of harmonic interactions between traction vehicle and DC supply

Time domain computer simulation offers the possibility of calculation of harmonics of most complex systems. Although frequency based calculations often offer more general solutions, they cannot be applied in some cases (for example when the converter is controlled by free-running hysteresis control methods). In the paper models of a traction vehicle, substation and a novel model of a 3 kV contact line that represents frequency dependence of its parameters is presented. Selected results of a simulation study of harmonic interactions between a traction vehicle equipped with thyristor converters and the 3 kV supply systems are shown