Hybrid subway traction two-way power supply device

Abstract

The invention discloses a hybrid metro traction bidirectional power supply device, and the power supply device comprises a first bidirectional converter, a second bidirectional converter, a first diode rectifier bridge, a second diode rectifier bridge and a secondary side multi-winding boosting transformer. DC sides of the first bidirectional converter, the second bidirectional converter, the first diode rectifier bridge and the second diode rectifier bridge are connected with a DC power grid; the secondary side multi-winding boosting transformer is provided with four low-voltage windings, and the alternating current sides of the first bidirectional converter, the second bidirectional converter, the first diode rectifier bridge and the second diode rectifier bridge are connected to one corresponding low-voltage winding of the secondary side multi-winding boosting transformer; and a high-voltage winding of the boosting transformer is connected to a medium-voltage power grid. According to the subway traction bidirectional power supply device, the bidirectional converter and the diode rectifier are mixed, the triple overload capacity can be provided under the condition that the cost is not increased much, and the power supply reliability of a traction system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of urban rail transit power supply systems, in particular to a hybrid subway traction bidirectional power supply device. Background technique [0002] In recent years, my country's urban rail transit has developed very rapidly. In order to respond to the national energy-saving and emission-reduction policy, the domestic subway traction power supply system gradually promotes the mode of diode rectifier unit + regenerative braking energy feedback device to achieve the purpose of reducing energy consumption. However, the voltage of the DC traction network output by the diode rectifier unit will drop greatly as the load increases, resulting in a short power supply distance, requiring an increase in the number of traction power supply stations, and increasing the construction cost of the subway. At the same time, the added regenerative braking energy feedback device further increases the complexity and floor spac...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the above two existing technologies are bidirectional converters based on IGBT (Insulated Gate Bipolar Transistor), but the overload capacity of IGBT devices is limited and expensive, and can usually achieve twice the short-term overload, but in the face of The extreme working condition of triple overload needs to pay a large cost

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