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Non-isolated cascaded two-phase-single-phase converter and railway traction power supply system

A non-isolated, converter technology, applied in the direction of AC power input conversion to AC power output, electrical components, AC network voltage adjustment, etc. Volume versus construction cost, effects of improved safety and reliability

Active Publication Date: 2022-03-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the same-phase power supply technology cannot cancel the electric phase separation between traction substations, and cannot realize the connection of the whole line

Method used

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  • Non-isolated cascaded two-phase-single-phase converter and railway traction power supply system
  • Non-isolated cascaded two-phase-single-phase converter and railway traction power supply system
  • Non-isolated cascaded two-phase-single-phase converter and railway traction power supply system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The technical scheme that the present invention solves the problems of the technologies described above is as follows:

[0048] The present invention provides a non-isolated cascaded two-phase-single-phase converter, referring to image 3 and Figure 4 As shown, the non-isolated cascaded two-phase-single-phase converter includes an α-phase part and a β-phase part, the α-phase part includes a first rectification cascade substructure, and the β-phase part includes a second rectification stage A cascaded substructure, wherein the first cascaded rectification substructure and the second cascaded rectification substructure jointly constitute a multi-module cascaded structure of the non-isolated cascaded two-phase-single-phase converter;

[0049] In the present invention, the existence of the multi-module cascade structure can convert the input two-phase input into a single-phase output, namely:

[0050] The first rectification cascade substructure includes a first positive...

Embodiment 2

[0076] Based on the above technical solution, the present invention also provides a railway traction power supply system, which includes the above-mentioned non-isolated cascaded two-phase-single-phase converter, and further includes:

[0077] A traction transformer, the traction transformer includes a secondary winding α and a secondary winding β, the output terminal of the secondary winding α is connected to the first positive input terminal, its ground terminal is connected to the first ground terminal, and the secondary winding α The output terminal of the side winding is connected to the second positive input terminal, and its ground terminal is connected to the second ground terminal;

[0078] The positive output end of the non-isolated cascaded two-phase-single-phase converter is connected to the traction network of the railway, and the negative output end is connected to the rail of the railway.

[0079] Here, the three-phase-two-phase transformer may be a YNd11 transf...

Embodiment 3

[0083] Traditional AC-DC-AC multi-module cascaded converters often adopt two structures in order to avoid short circuit of DC capacitors. One is as follows: figure 1 The AC-DC-AC multi-module cascaded converter shown in the pre-stage rectifier is connected to the traction transformer through a multi-tap transformer; the other is as shown in figure 2 The shown AC-DC-AC multi-module cascaded converter is electrically isolated through a power electronic transformer such as an isolated DC-DC converter, so as to avoid a short circuit of the DC capacitor. Both of the above two structures belong to hardware isolation, and the cost and volume of the system are relatively large.

[0084] In order to avoid the switching state of the short-circuit of the DC capacitors of the front-stage rectifier and the rear-stage inverter of the non-isolated AC-DC-AC multi-module cascaded converter, a legal modulation switch state that can avoid short-circuit is selected during the modulation process....

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Abstract

The invention discloses a non-isolated cascading type two-phase-single-phase converter and a railway traction power supply system, the non-isolated cascading type two-phase-single-phase converter comprises an alpha phase and a beta phase, the alpha phase comprises a first rectification cascading substructure, the beta phase comprises a second rectification cascading substructure, and the alpha phase comprises a first rectification cascading substructure and a second rectification cascading substructure. The first rectification cascade substructure and the second rectification cascade substructure jointly form a multi-module cascade structure of the non-isolated cascade type two-phase to single-phase converter; the first rectification cascade substructure comprises a first positive pole input end, a first grounding end and a first output end, and the second rectification cascade substructure comprises a second positive pole input end, a second grounding end and a second output end; the first anode input end, the first grounding end, the second anode input end and the second grounding end jointly form two-phase input of the multi-module cascade structure; the first output end and the second output end jointly form single-phase output of the multi-module cascade structure, the first output end serves as a positive electrode output end of the multi-module cascade structure, and the second output end serves as a negative electrode output end of the multi-module cascade structure.

Description

technical field [0001] The invention relates to the technical field of railway traction power supply, in particular to a non-isolated cascaded two-phase-single-phase converter and a railway traction power supply system. Background technique [0002] The electrified traction power supply system in my country mostly adopts the split-phase power supply mode, and the split-phase power supply system uses the traction transformer to connect the locomotive load to the three-phase power grid. Due to the differences in the voltage phase and amplitude of each power supply arm, it is necessary to set an overshoot to isolate each phase. Excessive phase separation is not only expensive, but also restricts the continuous high-speed operation of vehicles, and even causes serious problems such as parking on slopes for heavy-duty vehicles. Moreover, the randomness and uncertainty of locomotive loads cause the negative sequence, reactive power and harmonic problems of the primary three-phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/293H02J3/18H02J3/16
CPCH02M5/293H02J3/18H02J3/16Y02E40/30Y02E40/40
Inventor 舒泽亮徐寄望孟令辉周犹松徐翊宸
Owner SOUTHWEST JIAOTONG UNIV
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