Filtering type power transformer integrated system and implementation method thereof

A power transformer and integrated system technology, applied in the direction of transformer/inductor coil/winding/connection, harmonic reduction device, electrical component structure association, etc., can solve the problem of large filter cost investment, large harmonic injection into the grid, and harmonic High current and other problems, to improve the safe operation level, improve the power factor, reduce the effect of harmonic loss

Active Publication Date: 2012-12-12
HUNAN HUADA ELECTRICIAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unsatisfactory effect of traditional filtering methods, the harmonics injected into the grid are still relatively large, even exceeding the national standard requirements
For users with small harmonic source loads, most of them do not install filters because of the large investment in filters and the low awareness of harmonics. The injected harmonic current is very large, which is injected into the grid through the transformer, thus affecting the quality of power supply of the grid

Method used

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  • Filtering type power transformer integrated system and implementation method thereof
  • Filtering type power transformer integrated system and implementation method thereof
  • Filtering type power transformer integrated system and implementation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] seefigure 1 and image 3 (a), the transformer of the filter-type power transformer integrated system adopts a three-winding structure, including high-voltage winding (voltage level is 220kV), medium-voltage winding (voltage level is 110kV) and low-voltage shielded winding (voltage level is 10kV). The low-voltage shield winding is set between the high-voltage winding and the medium-voltage winding (see image 3 (a)), the low-voltage winding is connected to the filter compensation device.

[0041] The filter device is designed according to full tuning, that is, for a certain harmonic (such as the 5th harmonic), the 5th harmonic reactance of the filter branch is equal to the 5th harmonic capacitive reactance, that is, ω 5 L=1 / ω 5 C, the total impedance of the branch is zero, realizing full tuning. The design principles of the filter branches of other harmonic orders are the same.

[0042] exist figure 1 Among them, the filter-type power transformer adopts a multi-wind...

Embodiment 2

[0047] see figure 2 and image 3 (b), the transformer of the filter-type power transformer integrated system adopts a four-winding structure, including high-voltage windings (voltage level is 220kV), medium-voltage windings (voltage level is 110kV), low-voltage windings and shielded windings (voltage level is 10kV) . The shield winding is placed between the HV and MV windings (see image 3 (b)), the shielding winding is connected to the filter compensation device.

[0048] The filter compensation device (filter) is a series structure of reactor L and capacitor C, and the inductive reactance and capacitive reactance for a specific harmonic are equal, that is, ω n L=1 / ω n C, where ω is the fundamental angular frequency, and n is the harmonic order. The filter device is designed according to full tuning, that is, for a certain harmonic, taking the 5th harmonic as an example, the 5th harmonic reactance of the filter branch is equal to the 5th harmonic capacitive reactance, t...

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Abstract

The invention discloses a filtering type power transformer integrated system and an implementation method thereof. The filtering type power transformer integrated system comprises a transformer and a filtering compensating device, wherein the transformer is provided with a three-winding structure or a four-winding structure; the three-winding structural transformer comprises a high-voltage winding, a medium-voltage winding and a low-voltage shielded winding, wherein the low-voltage winding and the shielded winding share one winding; the low-voltage (shielding) winding is arranged between the high-voltage winding and the medium-voltage winding, and the low-voltage (shielding) winding is connected with the filtering compensating device; the four-winding structural transformer comprises a high-voltage winding, a medium-voltage winding, a low-voltage winding and a shielding winding; and the four windings, namely the low-voltage winding, the medium-voltage winding, the shielding winding and the high-voltage winding are arranged on an iron core of the transformer in sequence, and the shielding winding is connected with the filtering compensating device. The filtering type power transformer integrated system and the implementation method thereof provided by the invention have the advantages of reducing harmonic loss, and improving power factor.

Description

technical field [0001] The invention relates to a filter-type power transformer integration system and its realization method, which can be applied to substations with harmonic source loads or industrial user substations (or power distribution rooms) generating harmonics in the power system. Background technique [0002] A large number of applications of nonlinear loads such as smelting, chemical industry, and electric railway have caused problems such as large harmonic pollution and low power factor. The harmonic current generated by the nonlinear load flows into the grid side, which will cause serious pollution to the grid. Because harmonics flow in the power grid, it not only produces a large loss, but also brings great safety hazards to primary and secondary equipment such as transformers and relay protection, seriously affecting the safety and economic operation of the power grid, and affecting the reliable power supply of the power grid . For users with large harmoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/28H01F27/40H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 黄文涛刘福生
Owner HUNAN HUADA ELECTRICIAN HI TECH
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