Direct-current vehicle traction system

Abstract

The invention discloses a direct-current vehicle traction system and relates to the technical field of traction power. The direct-current vehicle traction system is used for solving the problems that in the prior art, energy cannot flow in a bidirectional mode, and the equipment safety is threatened due to the fact that the voltage of a direct-current electric network is increased during vehicle regenerative braking. The direct-current vehicle traction system comprises a filter circuit, a traction braking circuit and a processor. The traction braking circuit comprises a power supply input positive pole A+ end which is sequentially connected with a first brake resistor, a first current transformer, a first motor device, a second traction contactor, a first inductor and a first GTO thyristor in series through a first traction contactor, finally, the power supply input positive pole A+ end is connected to a power supply input negative pole A- end, and the first inductor is connected with the positive pole of the first GTO thyristor; the power supply input positive pole A+ end is sequentially connected with a second motor device, a second current transformer, a second brake resistor, a second traction contactor, the first inductor and the first GTO thyristor in series through the first traction contactor; and the contactors, a current sensor, a voltage sensor and the thyristor are all connected with the processor.

Description

technical field [0001] The invention relates to the technical field of traction power, and more specifically relates to a DC vehicle traction system. Background technique [0002] With the rapid development of the national economy, urban traffic problems have become increasingly prominent. The development of urban rail transit systems represented by subways is the only way to solve urban traffic problems. At present, urban rail transit traction grids use DC grids rectified by diodes. Two-way flow; and the operating characteristics of urban rail transit vehicles are: frequent startup acceleration, frequent braking and deceleration, the electric energy generated during vehicle regenerative braking will increase the DC grid voltage and threaten the safety of equipment. [0003] To sum up, the existing DC vehicle traction system adopts the DC grid, and there are problems that the energy cannot flow in both directions, and the voltage of the DC grid is raised during the regenerat...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a DC vehicle traction system, which is used to solve the problems that the existing DC vehicle traction system adopts the DC grid, the energy cannot flow in both directions, and the voltage of the DC grid is raised during the regenerative braking of the vehicle, which threatens the safety of the equipment.

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