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Electrically driven passenger transport vehicles are supplied with energy by an external electric supply network. If the external energy supply fails, vehicles of this type require special auxiliary devices that do not rely on the supply network, for example rely on auxiliary vehicles, in order to m

Electrically driven passenger transport vehicles are supplied with energy by an external electric supply network. If the external energy supply fails, vehicles of this type require special auxiliary devices that do not rely on the supply network, for example rely on auxiliary vehicles, in order to move said vehicles again. A vehicle can move independently during a failure of the external energy supply, by switching the electric drive of said vehicle to a battery drive.

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What is claimed is: 1. A vehicle comprising: an electric drive adapted to receive operating power from an external electric supply system, a battery located on-board the vehicle, the battery having a rated voltage which is less than or equal to 10% of voltage of the external electric supply system;

What is claimed is: 1. A vehicle comprising: an electric drive adapted to receive operating power from an external electric supply system, a battery located on-board the vehicle, the battery having a rated voltage which is less than or equal to 10% of voltage of the external electric supply system; and a control unit for actuating the electric drive; wherein the electric drive is configured and operative to operate with the voltage of the external electric supply system and can be supplied by and is configured to be operated by the battery when the external electric supply system is disconnected or fails, the battery being configured and operative for supplying an on-board electrical supply system of the vehicle for functions other than traction in a normal operating mode of the electric drive, during which the drive is being supplied by an external electric supply system, the electric drive comprises a power unit, and an electric motor connected to the power unit, and the power unit comprises a switched rectifier power inverter controlled by a PWM driver, and the control unit being configured and operative to compensate voltage drops delivered to the motor when the electric drive is operated by the battery by adjusting the PWM duty cycle to increase the current output of the switched rectifier power inverter. 2. The vehicle as claimed in claim 1 further comprising at least one circuit breaker connected to the electric drive, to the external electric supply system and to the battery, the circuit breaker being operable to disconnect the electric drive from the external electric supply system and to connect it to the battery, and vice versa. 3. The vehicle as claimed in claim 1, wherein the electric motor is an asynchronous motor. 4. A vehicle as claimed in claim 1, wherein the electric drive is operable by a 600V supply system and the battery has a 24V rated voltage. 5. The vehicle as claimed in claim 1, wherein the switched rectifier power inverter comprises operative semiconductor components, and the control unit operates the switched rectifier power inverter to compensate for the inherent losses in the semiconductor components of the switched rectifier power inverter when the electric drive is operated by the battery. 6. A method for operating a vehicle having an electric drive which is adapted to receive operating power from an external electric supply system and which is configured with respect to the voltage of the external electric supply system wherein the electric drive comprises an electric motor coupled to drive the vehicle, and a power unit including a switched rectifier power inverter controlled by a PWM driver which provides power to, and controls the motor, the method comprising: connecting the power unit to the external electric supply system to provide operating power for the motor during a normal operating mode for the electric drive; switching the electric drive over to an on-board battery operating mode when the external electric supply system is disconnected or fails, wherein the voltage of the battery is less than or equal to 10% of the external supply system voltage, and the battery supplies power for an on-board electrical supply system of the vehicle in the normal operating mode; adjusting the electric drive to compensate voltage drops delivered to the motor when the power unit is supplied by the battery by adjusting the PWM duty cycle to increase the current output of the switched rectifier power inverter; and operating the adjusted electric drive on the battery voltage. 7. The method as claimed in claim 6, further comprising optimizing use of stored power available in the battery. 8. The method as claimed in claim 7, wherein the power which is extracted from the battery is limited and use of the limited power is optimized. 9. The method as claimed in claim 7, further comprising limiting a setpoint torque of the electric motor of the electric drive. 10. A method as claimed in claim 7, wherein the use of the stored power available to the battery is optimized with respect to power utilization by the electric drive. 11. A method as claimed in claim 6, wherein the on-board supply system is an electronic control system of the vehicle. 12. A method for retrofitting a vehicle having an electric drive which is adapted to receive operating power from an external electric supply system, the method comprising: providing a battery on the vehicle having a rated voltage which is less than or equal to 10% of voltage of the external electric supply system, if one is not already present, the battery being configured and operative for supplying an on-board electrical supply system of the vehicle in a normal operating mode of the electric drive, in which mode the electric drive is supplied by an external electric supply system; connecting a circuit breaker located on the vehicle to selectably provide power from the battery to a power unit of the electric drive, wherein the power unit comprises a switched rectifier power inverter controlled by a PWM driver; and replacing or updating a control unit for actuating the power unit of the electric drive to compensate voltage drops delivered to the motor when the electric drive is operated by the battery by adjusting the PWM duty cycle to increase the current output of the switched rectifier power inverter. 13. The method as claimed in claim 12, further comprising installing a battery management unit which optimizes the use of the battery.