| 摘要 |
A drive unit of a railway vehicle is controlled to travel at a constant speed, wherein harmonic currents generated by a converter device are reduced, and harmonic losses of a transformer is reduced. When the railway vehicle is controlled to travel at a constant reference speed, or stopped, a carrier frequency of the converter device is raised from a first reference frequency to a second reference frequency, and when the vehicle is controlled by acceleration and deceleration commands, the carrier frequency is reduced from the second reference frequency to the first reference frequency. The drive unit comprises transformer 3 for stepping down the overhead wire 1 voltage and supplying single-phase AC power to a converter 5. The converter rectifies the single-phase AC power to DC power. A DC-side of the converter device is connected, via a capacitor 6 for stabilizing the voltage, to inverter device 7. The inverter device converts the DC power to three-phase AC power for driving at least one AC motor 8. |
