Research on the control method of a high power traction power supply system without AC inductances

In order to meet the needs of regenerative braking energy´s feedback in the DC traction power supply system, a large capacity and high power density converter system topology based on the diode rectifier set and the PWM rectifier set in parallel is proposed in this paper. The diode rectifier set adopts multi-pulse rectifier based on phase shifting transformer. The PWM converter set is made up of two paralleled PWM converters and a double split transformer. The leakage inductances of the transformer windings are used to replace the AC inductances of each PWM converter, which can reduce the system volume and improve the reliability. The control method of the PWM converter without the AC inductances, and the coordinated control between the PWM converter set and the diode rectifier set are both studied in this paper. The corresponding solutions are given, and the effectiveness is verified by simulation and experiments.