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Electrified railway in-phase power supply device

An electrified railway and co-phase power supply technology, applied in the field of co-phase power supply, can solve the problems of increasing the difficulty of design and maintenance, poor scalability, etc., and achieve the effects of improving stability, increasing scalability, and reducing design

Inactive Publication Date: 2013-02-06
XJ ELECTRIC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of poor system stability and expandability brought about by the chain static synchronous compensation method in the same-phase power supply, and the need to use high-power transformers to increase the difficulty of design and maintenance

Method used

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  • Electrified railway in-phase power supply device
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  • Electrified railway in-phase power supply device

Examples

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Embodiment 1

[0018] The main circuit of embodiment 1 is as Figure 5 As shown, it is assumed that the rated voltage of the same-phase power supply device is 27.5kV, and the rated capacity is 10MVA. The main circuit of the electrified railway in-phase power supply device is composed of four in-phase power supply units. Each in-phase power supply unit is composed of two 27.5kV double-winding isolation transformers (2, 5), supporting capacitor C, two sets of rectifier converters 3 and two sets of inverter converters 4; a single in-phase power supply unit is as described above . The whole device has eight sets of 27.5kV double-winding isolation transformers, eight sets of rectifier converters 3, four support capacitors C, and eight sets of inverter converters 4.

[0019] The structure and parameters of each transformer are consistent, the rated capacity is 1.25M, the secondary side is double winding, the voltage transformation ratio is 27.5kV / 0.5kV / 0.5kV, and the short-circuit impedance is 1...

Embodiment 2

[0024] The circuit of embodiment 2 is as Figure 4 As shown, the difference from Embodiment 1 is that there is only one in-phase power supply unit, and a three-winding transformer is used as the input and output multi-winding transformers, corresponding to three sets of rectifier converters 3 and three sets of inverter converters 4 .

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Abstract

The invention relates to an electrified railway in-phase power supply device. The device comprises at least one in-phase power supply unit. Each in-phase power supply unit is connected in parallel between an input power supply arm and an output power supply arm; the in-phase power supply unit comprises an input transformer and an output transformer with a plurality of completely the same secondary windings; a back-to-back AC-DC-AC circuit is connected between each pair of secondary windings of the two transformers; a rectification side of the circuit is connected with the secondary winding corresponding to the input transformer, while an inversion side thereof is connected with the secondary winding corresponding to the output transformer; DC sides of the back-to-back AC-DC-AC circuit of each in-phase power supply unit share one supporting capacitance; and the supporting capacitances of the in-phase power supply units are connected in parallel by isolation switches at both ends of the in-phase power supply units. The electrified railway in-phase power supply device adopts the design of modularization of the in-phase power supply units, improves stability and expansibility of the system, adopts a plurality of low-power transformers to replace single high-power transformer and reduces requirements on design, manufacture, maintenance difficulty and insulation of the transformer.

Description

technical field [0001] The invention relates to the field of in-phase power supply for electrified railways. Background technique [0002] The electric energy of the electrified railway is provided by the electric traction power supply system. Electric traction power supply system includes traction substation and traction network. After the traction substation steps down the high voltage to 27.5kV or 55kV, it supplies power to the electric locomotive through the traction network. The same-phase power supply method can avoid the electric phase separation link caused by commutation power supply, reduce the failure rate, and further increase the speed of the electric locomotive. [0003] Since the electric locomotive is a high-power single-phase rectified traction load, the negative sequence current and harmonics generated during operation, as well as the system voltage fluctuation and low power factor caused by the impact load, all have adverse effects on the power grid and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60M3/00H02M5/42
Inventor 张建兴陈天锦张东江魏众陈世峰米高祥曹智慧
Owner XJ ELECTRIC