Pre-charge loop of traction converter and control method

A technology of traction converter and pre-charging circuit, which is applied in the field of rail vehicle traction conversion, can solve the problems of large power loss and poor robustness, and achieve the effects of reduced failure rate, reduced work impact, and reduced impact

Inactive Publication Date: 2018-10-09
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the aforementioned problems of poor robustness and large power loss in existing traction converters, the present invention provides a precharging circuit and control method for traction converters with strong robustness and small power loss

Method used

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  • Pre-charge loop of traction converter and control method
  • Pre-charge loop of traction converter and control method
  • Pre-charge loop of traction converter and control method

Examples

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Embodiment Construction

[0042] In the following, the present invention will be specifically described through exemplary embodiments. It should be understood, however, that elements, structures and characteristics of one embodiment may be beneficially incorporated in other embodiments without further recitation.

[0043] In the description of the present invention, it should be noted that the terms "first" and "second" are used for description purposes only, and should not be understood as indicating or implying relative importance.

[0044] see image 3 , Figure 4 , an embodiment of the present invention provides a pre-charging circuit of a traction converter, including a first heavy pre-charging circuit 2 and a second heavy pre-charging circuit 3 respectively connected to the secondary side winding of the traction transformer 1, and the The first heavy four-quadrant rectifier module 4 connected in series with the first heavy pre-charging circuit 2 and the second heavy four-quadrant rectifier modu...

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Abstract

The invention relates to a pre-charge loop of a traction converter and a control method. The pre-charge loop comprises a first heavy pre-charge circuit and a second heavy pre-charge circuit which arerespectively connected with the secondary side windings of a traction transformer, a first heavy four-quadrant rectifier module connected in series with the first heavy pre-charge circuit and a secondheavy four-quadrant rectifier module connected in series with the second heavy pre-charge circuit, wherein the output end of the first heavy four-quadrant rectifier module is connected with a first middle direct-current supporting capacitor FC11 at the input end of a middle direct-current voltage loop, and the output end of the second four-quadrant rectifying module is connected with a second middle direct-current supporting capacitor FC12 at the input end of the middle direct-current voltage loop. The invention is provided with double pre-charge circuits. Two four-quadrant rectifier modulesshare a bus of the middle direct-current voltage loop, so that the traction converter is provided with a hardware condition of single four-quadrant operation. The power availability of the traction converter is improved, and the robustness is high.

Description

technical field [0001] The invention belongs to the technical field of rail vehicle traction converters, and relates to a pre-charging technology for a rail vehicle traction converter, in particular to a pre-charging circuit and a control method for a traction converter. Background technique [0002] There is a large capacitor in the middle DC link of the traction converter. If there is no limit to the charging current of the capacitor, the capacitor will generate a relatively large charging current at the initial stage of power-on. Excessive current may cause damage or destruction of the device. Therefore, the traction converter usually adopts a set of pre-charging circuit. When the traction converter is pre-charging, the contactor is used to connect the pre-charging resistor to the charging circuit to limit the charging current within a controllable and reasonable range. After that, isolate the pre-charging resistor. [0003] Short (typically 4) intercity EMUs serve adja...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M5/42
CPCH02M1/32H02M5/42
Inventor 张春磊吴强杜广群杨志浩潘景宇汪志
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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