Primary traction converter for multi-system locomotives

This paper presents research motivated by industrial demand for special traction drive topology devoted to minimization of traction transformer weight against topology with classical 50 Hz traction transformer. The main attention has been given to the special traction drive topology for AC power systems: input high voltage trolley converter (single phase) - middle frequency transformer (single phase) - output converter (single phase voltage-source active rectifier + three phase voltage-source inverter) - traction motor. The proposed converter control algorithm of innovative traction topology with middle-frequency transformer has been described in detail. The theoretical conclusions and simulation results are compared with experimental measurements on laboratory model with rated power of 4 kVA.