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Three-phase 24-pulse traction rectifier transformer

A rectifier transformer and pulse wave rectification technology, which is applied in the field of converter to achieve the effect of improving the quality of the power grid

Inactive Publication Date: 2013-04-03
JIANGSU HUAPENG TRANSFORMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For grid-connected operation of multiple 24-pulse traction rectifier transformers, how to maintain the existing operating mode, that is, without increasing costs, there is no feasible method to eliminate the 23rd and 25th rectification harmonics collected in the grid

Method used

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Embodiment Construction

[0019] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0020] figure 1 A 24-pulse rectifier circuit consisting of a three-phase 24-pulse rectifier transformer and a three-phase bridge rectifier is shown. H1, L1 and L2 in the figure are the winding connection diagrams of a 12-pulse rectifier transformer, and H2, L3 and L4 are The winding connection diagram of another 12-pulse rectifier transformer; the two 12-pulse rectifier transformers form a 24-pulse rectifier transformer; among them, H1 and H2 are high-voltage windings, and L1, L2, L3 and L4 are low-voltage windings.

[0021] figure 2 Shown is the winding part of a three-phase 12-pulse rectifier transformer, H is the high-...

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Abstract

The invention relates to a three-phase 24-pulse traction rectifier transformer. The three-phase 24-pulse traction rectifier transformer consists of two 12-pulse rectifier transformers, wherein the phase-shifting angle of high-voltage windings of the three-phase 24-pulse traction rectifier transformer can be subjected to double-gear adjustment at 7.5 DEG; and the phase-shifting angle of the high-voltage windings is adjusted, and the phase-shifting angle of the output voltage of the three-phase 24-pulse traction rectifier transformer is 7.5 DEG. When a plurality of three-phase 24-pulse traction rectifier transformers are operated in parallel, the phase angle of the high-voltage windings of one three-phase 24-pulse traction rectifier transformer (gear 1) is adjusted to differ from that of another three-phase 24-pulse traction rectifier transformer (gear 2) by 7.5 DEG at intervals. The 23 times and 25 times of rectification harmonic waves of the plurality of rectifier transformers can be mutually offset on a power grid side, and 5 times, 7 times, 11 times and 13 times of residual rectification harmonic waves of the plurality of 24-pulse rectifier transformers can be mutually offset on the power grid side partially, so that the harmonic waves of a power grid are reduced, and the quality of the power grid is improved.

Description

technical field [0001] The invention relates to the technical field of converting alternating current into direct current, in particular to a traction rectifying transformer for subways. Background technique [0002] The subway traction 1500V or 800V DC power supply is usually powered by a 24-pulse rectifier substation composed of two 12-pulse rectifier transformers and rectifiers, such as figure 1 . A tens of kilometers of subway needs many such 24-pulse rectifier substations along the line. When multiple 24-pulse rectifier substations are connected to the grid, large 23rd and 25th rectification harmonics will be generated together. These harmonics will reduce the quality of the power grid and interfere with the normal operation of other electrical equipment. In order to eliminate or reduce the 23rd and 25th grid harmonics, the current technical measure is to use 48-pulse rectification or filtering. [0003] For grid-connected operation of multiple 24-pulse traction rect...

Claims

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Application Information

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IPC IPC(8): H02M5/10H02M7/06H01F27/28H02J3/01
CPCY02E40/10Y02E40/40
Inventor 曾庆赣
Owner JIANGSU HUAPENG TRANSFORMER
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