DC traction power supply device

Abstract

The invention discloses a DC traction power supply device comprising a voltage reduction module, an AC / DC conversion module, a voltage distribution module and a DC / DC voltage conversion module which are connected in sequence, wherein the voltage reduction module is connected into a three-phase power supply through a high-voltage circuit breaker for three-phase voltage reduction; the AC / DC conversion module converts AC into DC and carries out power transmission; the voltage distribution module comprises a plurality of voltage distribution units connected in series and carries out series voltage distribution on the DC; the DC / DC voltage conversion module comprises a plurality of DC / DC voltage conversion units connected in parallel; each DC / DC voltage conversion unit is connected to one voltage distribution unit in parallel and carries out DC voltage conversion on distributed voltage output by the voltage distribution unit, and the converted voltage is output to a DC traction power supply system in parallel. The DC traction power supply device is wide in application range and small in work amount, saves cost, achieves DC power supply of the traction system under the condition of not changing an AC traction power supply network structure, and has the advantage of solving the application problems of high input voltage and large output current.

Description

technical field [0001] The invention relates to the technical field of locomotive traction power supply, in particular to a DC traction power supply device in an AC traction power supply system. Background technique [0002] At present, there are mainly four types of power supply systems in Europe, namely AC 15kV / 16.7Hz, AC 25kV / 50Hz, DC 1.5kV and DC 3kV; while the power supply systems adopted by American railways mainly include AC 12.5kV / 60Hz and 25kV / 60Hz; Many neighboring countries and regions in Europe often have 2 to 4 power supply systems. With the development of multi-stream locomotives, and in order to meet the requirements of cross-regional and transnational transportation, the use of a completely unified railway network power supply system can reduce the workload, save costs and be more practical. [0003] In my country, due to the difference in voltage level and current system, the traction power supply system of railway electric locomotives and the traction pow...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: aiming at the technical problems existing in the prior art, the present invention provides a simple structure principle, wide application range, cost saving and engineering quantity, and does not change the structure of the existing AC traction power supply network. DC power supply for traction system, a DC traction power supply device that can solve the application problem of high input voltage and large output current

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