The study of the traction topology with the middle-frequency transformer

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 matrix converter) - middle frequency transformer - output converter - traction motor. Several variants of control algorithms (Inserting of NULL vector, Two-valued control, PWM, Control by secondary active voltage rectifier) of innovative traction topology with middle-frequency transformer have been described.