Novel alternating-current and direct-current hybrid tractive power supply system

A traction power supply system, AC and DC hybrid technology, applied in the direction of irreversible AC power input conversion to DC power output, single AC network with different frequencies, conversion equipment that can be converted to DC without intermediate conversion, etc., can solve the problem of The possibility of failure increases, the equipment cannot work normally, and the equipment manufacturing cost is increased, so as to achieve the effects of reducing harmonic content, saving investment costs and engineering quantities, and reducing floor space.

Inactive Publication Date: 2016-08-17
江苏同芯电气科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages of existing technology: figure 1 In the power supply system shown, the DC and AC traction parts are powered independently, which will undoubtedly increase the cost of equipment manufacturing
The converter for DC power supply adopts multi-level converter (MMC) and DC / DC converter, that is, the mode of AC / DC plus DC / DC conversion, which undoubtedly increases the complexity of the system and makes the possibility of system failure increased performance and increased system cost
figure 2 Although the DC traction power supply system shown does not change the structure of the original AC traction grid, the structure of DC / DC conversion after voltage division by multiple capacitors will increase the complexity of the system and reduce the stability, and these The DC / DC modules need to work at the same time, if one of the modules is damaged, the whole device will not work normally; and the system cost will also increase

Method used

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  • Novel alternating-current and direct-current hybrid tractive power supply system
  • Novel alternating-current and direct-current hybrid tractive power supply system
  • Novel alternating-current and direct-current hybrid tractive power supply system

Examples

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Embodiment 1

[0023] see image 3 , 4 , 5. The present invention provides a technical solution: a novel AC-DC hybrid traction power supply system, comprising a step-down transformer 1 and a converter, the converter is connected to the secondary side of the step-down transformer 1, and the converter Each bridge arm is composed of N H-bridge 4 circuits, the value range of N is N>1, and N is an integer, the H-bridge 4 includes S1, S2, S3 and S4, S1 and S4 are connected in series, S2 and S3 are connected in series, Then the two series structures are connected in parallel again. The control circuit of the inverter is composed of two SVG1 and SVG2 circuits with the same structure connected in parallel. SVG1 is composed of three H-bridges 4. One end of single-phase AC is connected, and the other end is connected to three-phase voltage sources A, B, and C respectively. The voltages at the two ends of the three bridge arms are Vau, Vbu, and Vcu respectively; the SVG2 unit is composed of three H-bri...

Embodiment 2

[0028] see Figure 4 , 5, 6. The other technical features of this embodiment are the same as those of Embodiment 1, the difference being that: the primary side of the step-down transformer 1 is connected to the output terminal through the traction transformer 2, and the secondary side of the step-down transformer 1 is connected to the output terminal. There are SVG1 and SVG2 circuits connected in series, and the input end of the converter is the output end of the traction substation. The power supply of the converter mainly completes the transformation from three-phase AC to DC, and requires fewer power units, thereby reducing the complexity of the control algorithm. In a sense, the stability of the system is improved, and the converter power supply in this embodiment can also be used for reactive power compensation when the DC power supply is not required.

Embodiment 3

[0030] see Figure 5 , 6 , 7. The other technical features of this embodiment are the same as those of Embodiment 1, the difference being that: Phase B on the secondary side of the step-down transformer 1 is grounded, Phase A and Phase C are connected to the output terminal through a series switch, and the step-down There are SVG1 and SVG2 circuits connected in series between the secondary side of transformer 1 and the output end. The input end in this embodiment is the output end of the traction transformer. The converter power supply in this embodiment mainly completes three-phase AC to DC or single-phase Phase-to-high-voltage AC conversion, when three-phase AC is converted into single-phase AC, it also meets the same-phase power supply requirements of main line electrified railways, and completely makes up for the shortcomings of the original single-phase unbalanced power supply. Of course, another working mode is the converter power supply. Only the three-phase AC to DC c...

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Abstract

The invention discloses a novel alternating-current and direct-current hybrid tractive power supply system. The novel alternating-current and direct-current hybrid tractive power supply system comprises a step-down transformer and a converter. The converter is connected to the secondary side of the step-down transformer, and each bridge arm of the converter is composed of a circuit of N H bridges. Each H bridge comprises S1, S2, S3 and S4, wherein S1 is connected with S4 in series, S2 is connected with S3 in series, and then the two series structures are connected in parallel. A control circuit of the converter is formed by connecting an SVG1 circuit and an SVG2 circuit in parallel, wherein the SVG1 circuit and the SVG2 circuit are of the same structure. By adopting the same power supply, output of single-phase alternating current from three-phase alternating current is achieved, and output of direct current from three-phase alternating current is achieved.

Description

technical field [0001] The invention relates to the field of traction power supply systems, in particular to a novel AC-DC hybrid traction power supply system. Background technique [0002] Electrified railways can be divided into DC electrified railways and AC electrified railways according to the traction power supply system. The direct current system is suitable for applications such as urban rail transit and intercity main line railways with small traffic volume and passenger transport, which have short distances and light loads, and can give full play to their advantages of simple structure and good economic performance. At present, urban rail transit systems (such as subways and light rails) use 1500Vdc / 750Vdc power supply; AC electrified railways use 27.5kV / 50Hz single-phase AC power supply. Compared with DC power supply, AC power supply voltage is higher and transmission power is large, so it is widely used on mainline electrified railways. [0003] With the develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/02H02M7/12H02M5/22B60M3/00
CPCB60M3/00H02J3/02H02M5/22H02M7/12H02M1/008
Inventor 周细文章辉姜飚谈浩楠
Owner 江苏同芯电气科技有限公司
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