Traction power supply system low-frequency damping self-adaptive compensation device and control method thereof

A traction power supply system, adaptive compensation technology, applied in power lines, transportation and packaging, reducing/preventing power oscillation, etc., can solve problems such as suppression, power loss, inability to realize low-frequency oscillation system, etc., to suppress low-frequency oscillation, avoid Waste, avoid the effect of the oscillation frequency calculation process

Active Publication Date: 2020-05-19
SOUTHWEST JIAOTONG UNIV +2
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Problems solved by technology

The above method is only aimed at the situation that the output impedance characteristics of the traction power supply system remain unchanged, and the fixed suppression measures cannot effectively suppress the low-frequency oscillation system with parameter changes; and if the system is stable, if the measures are not appropriate, it may cause additional power loss

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  • Traction power supply system low-frequency damping self-adaptive compensation device and control method thereof
  • Traction power supply system low-frequency damping self-adaptive compensation device and control method thereof
  • Traction power supply system low-frequency damping self-adaptive compensation device and control method thereof

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Embodiment Construction

[0043] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0044]A low-frequency damping adaptive compensation device for traction power supply system, such as figure 1 As shown, the compensation device includes: Transformer S d , AC side input inductance L d , single-phase rectifier bridge H and DC side support capacitor C d .

[0045] The drive signal SPWM of the single-phase rectifier bridge H can be determined by figure 2 The control circuit generation shown mainly includes: A / D sampling module, quadrature signal generation module, phase-locked loop, harmonic current detection module, virtual resistance generation module and damping compensation module. Orthogonal signal generation module is composed of orthogonal voltage and current signal generation loops, virtual impedance generation module is composed of oscillation self-adaptive judgment loop and virtual resistance calculation loop, da...

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Abstract

The invention discloses a traction power supply system low-frequency damping self-adaptive compensation device and a control method thereof. The self-adaptive compensation device comprises a transformer. The secondary side of the transformer is connected to the input end of a single-phase rectifier bridge through an AC side input inductor, and the output end of the single-phase rectifier bridge isconnected to a DC side supporting capacitor. The primary side of the transformer is used for being connected with the secondary side of a traction main transformer of a traction substation. A dampingself-adaptive compensation device is connected to a common coupling point of a secondary side output end of the traction substation main transformer of a traction power supply system and a locomotiveinput end in parallel so as to suppress low-frequency oscillation phenomenon, the control method and software and hardware parameters of each locomotive in the system do not need to be changed, and the normal working conditions of the locomotives are not influenced; and good compatibility is achieved.

Description

technical field [0001] The invention relates to the field of rail transit traction power supply systems, in particular to a low-frequency damping self-adaptive compensation device for traction power supply systems and a control method thereof. Background technique [0002] With the rapid development of my country's high-speed railway and heavy-duty transportation, a series of high-power AC-DC EMUs and electric locomotives have been put into operation, which has greatly improved the high-speed and heavy-duty transportation capacity of my country's railways. At the same time, the intensive running of AC-DC locomotives has led to frequent low-frequency oscillations in the traction power supply system, causing large fluctuations in the voltage and current of the traction network, triggering locomotive protection and causing traction lockout. Therefore, the problem of low-frequency oscillation has had a serious impact on national railway transportation. [0003] At present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24B60M3/00
CPCH02J3/24B60M3/00
Inventor 胡海涛李欣杨杰周毅何正友
Owner SOUTHWEST JIAOTONG UNIV
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