Power supply system for urban rail vehicle, and urban rail vehicle

The utility model provides a power supply system for an urban rail vehicle. The system comprises a storage battery, an alternating current transmission system, a contactor, a pantograph, a voltage transducer and a control unit; the pantograph, the voltage transducer, the control unit and a coil are connected with one another sequentially; the pantograph, a normally open contact of the contactor, and the alternating current transmission system are connected with one another sequentially; and the storage battery, the normally open contact of the contactor, and the alternating current transmission system are connected with one another sequentially. The power supply system supplies power to the alternating current transmission system through a contact network at a place with the contact network; and the power supply system supplies power to the alternating current transmission system through the storage battery at a place without the contact network; a contact network power supply network is not erected in an are