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A low-frequency damping adaptive compensation device for traction power supply system and its control method

A traction power supply system, adaptive compensation technology, applied in power lines, transportation and packaging, vehicle components, etc., can solve problems such as suppression, power loss, and inability to implement low-frequency oscillation systems, to suppress low-frequency oscillation, avoid waste, and avoid Effect of Oscillation Frequency Calculation Process

Active Publication Date: 2022-03-25
SOUTHWEST JIAOTONG UNIV +2
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  • Claims
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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

Method used

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  • A low-frequency damping adaptive compensation device for traction power supply system and its control method
  • A low-frequency damping adaptive compensation device for traction power supply system and its control method
  • A low-frequency damping adaptive compensation device for traction power supply system and its control method

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Embodiment Construction

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

[0044]A low-frequency damping adaptive compensation device for a traction power supply system, such as figure 1 As shown, the compensation device includes: a 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 shown control circuit generation 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. The quadrature signal generation module is composed of quadrature voltage and current signal generation loops, the virtual impedance generation module is composed of an oscillation adaptive judgment loop and a virtual resistance calculati...

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Abstract

The invention discloses a low-frequency damping self-adaptive compensation device for a traction power supply system and a control method thereof. The adaptive compensation device includes a transformer, the secondary side of the transformer is connected to the input terminal of the single-phase rectifier bridge through the input inductance of the AC side, and the output terminal of the single-phase rectifier bridge is connected to the supporting capacitor of the DC side; the primary side of the transformer is used to connect The secondary side of the traction main transformer in the traction substation. In the present invention, a damping self-adaptive compensation device is connected in parallel at the public coupling point of the secondary side output end of the main transformer of the traction substation of the traction power supply system and the input end of the locomotive to suppress the low-frequency oscillation phenomenon without changing the locomotives in the system The control method and software and hardware parameters do not affect the normal working conditions of the locomotive, and have good compatibility.

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 a traction power supply system and a control method thereof. Background technique [0002] With the rapid development of my country's high-speed railway and heavy-haul 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-haul transportation capacity of my country's railways. At the same time, the intensive operation of AC, DC, and AC locomotives leads 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 blocking. Therefore, the low frequency oscillation problem has a serious impact on the national railway transportation. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Patents(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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