Three-power-supply-system gear rail train power supply conversion circuit and rail traffic system

The utility model relates to a three-power-supply-system gear rail train power supply conversion circuit and a rail transit system, AC25kV or DC3000V power supply is received from a contact network through a train high-voltage circuit, the power supply is directly used for operation of a traction system after being distributed and converted, and meanwhile, the power supply is stored for a storage battery; when the electric energy of the storage battery is sufficient, low-speed running electric energy can be provided for a train traction system without high-voltage electricity. Under the condition that the train has high-voltage power supply, the train runs through high-voltage power supply, and under the condition that the train does not have high-voltage power supply, the train runs through DC110V power supply. Operation requirements of the wheel tooth rail train under different line conditions are met, a power supply system does not need to unify a power supply system, line power supply transformation cost