Particularities in the Implementation of the Rotor Flux-Oriented Control Algorithm in Railway Electric Traction Systems

In electric railway traction systems with asynchronous motors and rotor field-oriented control, the motor control is achieved by means of a four-quadrant converter (PWM step-up rectifier) and a voltage inverter. Under these conditions, the supply voltage and the current through the motor are distorted, and the motor load capacity decreases. Consequently, a specific phenomenon that may occur is the loss of capacity assuring prescribed torque followed by the improper operation of the entire system.