Drive device for railway vehicle

摘要

A control device for a railway vehicle controls an inverter device based on a direct-current link voltage Vfc between the opposite terminals of a filter capacitor. A direct-current voltage applied to the inverter device during regeneration is the sum of a voltage Vb of power storage equipment and an overhead wire voltage Vs, so that only detecting the direct-current link voltage Vfc is not enough to separate the voltage Vb of the power storage equipment and the overhead wire voltage Vs from each other. The power storage equipment can be connected in series with the inverter device, and a voltage sensor that detects the overhead wire voltage Vs is provided between a current collector device and a grounding point. The power storage equipment is controlled based on the detection result from the voltage sensor.

主权项

1. A drive device for a railway vehicle, comprising:
a current collector device acquiring a direct-current power from a direct-current voltage source; an inverter device that converts the direct-current power to an alternating-current power; one or more alternating-current motors driven by the inverter device; and a power storage device connecting to a direct-current power side of the inverter device, the driving device for a railway vehicle controlling the power storage device based on voltage values obtained from at least two of a first voltage sensor detecting a voltage of the direct-current voltage source, a second voltage sensor detecting a voltage of the power storage device and a third voltage sensor detecting a voltage on the direct-current side of the inverter device, wherein drive device for a railway vehicle further comprises a chopper circuit comprising a first switching element capable of conducting or blocking a current in a direction from the direct-current voltage source to a grounding point of the direct-current voltage source and a second diode element capable of conducting a current only in the opposite direction to the first switching element, the first switching element and the second diode element being connected in series with each other, a positive terminal of the power storage device is connected to a point of connection of the first switching element and the second diode element and to the grounding point of the direct-current voltage source, a negative terminal of the power storage device is connected to a negative side of the inverter device, and thereby the power storage device is connected to the inverter device in such a manner that the power storage device is capable of being connected in series with the inverter device, and a switching operation of the first switching element occurs in a state where the power storage device is connected in series with the inverter device.