MOTOR TRAIN UNIT RESCUE RETURNING DEVICE

摘要

A motor train unit rescue returning device, wherein a motor train unit is in a rescue returning state. The device comprises a storage battery (1), a precharging circuit (2), a three-phase inverter (3), an auxiliary inverter (4) and an alternating-current asynchronous motor (5). The precharging circuit (2) comprises a DC-DC converter (21) and is used for boosting a first direct-current voltage provided by the storage battery (1) to enable the voltage on a bus to reach a second direct-current voltage. The three-phase inverter (3) is used for converting the second direct-current voltage into an alternating current to premagnetize the alternating-current asynchronous motor (5) to enable the alternating-current asynchronous motor (5) to enter a fourth quadrant for operation. After the alternating-current asynchronous motor (5) enters the fourth quadrant for operation, the alternating-current asynchronous motor (5) outputs an alternating current according to mechanical energy generated by dragging the motor train unit, and the three-phase inverter (3) rectifies the alternating current to enable the voltage on the bus to reach a third direct-current voltage. The auxiliary inverter (4) is connected in parallel to the three-phase inverter (3) and used for converting the third direct-current voltage obtained from the bus into an alternating current, so as to realize auxiliary power supply to an auxiliary system load.