Phase shift balancing device of 18-pulse rectifier

A technology of pulse rectification and balancing device, applied in the field of transformers, can solve the problems of excessive transformer capacity, high production cost, low production efficiency, etc., and achieve the effects of reducing no-load loss of products, improving efficiency, and saving materials

Inactive Publication Date: 2012-10-24
GUANGDONG NRE TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a phase-shifting balance device for an 18-pulse rectifier, so as to solve the technical problem that the 18-pulse rectifier in the above-mentioned prior art has high production cost and low production efficiency due to its large transformer capacity

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  • Phase shift balancing device of 18-pulse rectifier
  • Phase shift balancing device of 18-pulse rectifier

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0015] Such as figure 1 The electrical connection schematic diagram of the 18-pulse rectification phase-shifting balance device in the present invention is shown, which includes a phase-shifting autotransformer 1 and a three-phase balancing reactor 2 . The phase-shifting autotransformer 1 is a polygonal autotransformer, the input is a set of 3Φ380V, and the output is two sets of 3Φ380V. Such as figure 2 As shown in the winding connection diagram of the phase-shifting autotransformer in the present invention, the phase-shifting autotransformer 1 includes an iron core 3 and a wire package 4, and the wire package 4 surrounds the iron core 3. Through reasonable arrangement of the windings, the two sets of outputs are set to be balanced st...

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Abstract

The invention discloses a phase shift balancing device of an 18-pulse rectifier. The phase shift balancing device comprises a phase shift auto-transformer and a three-phase balancing electric reactor, wherein the phase shift auto-transformer has a group of inputs with 3fai 380V and two groups of outputs 3fai 380V, and two groups of outputs respectively shift phases at the same angle toward the opposite direction. The impedance of the three-phase balancing electric reactor is matched with the phase shift auto-transformer, and input end of the three-phase balancing electric reactor is connected with the input end of the phase shift auto-transformer and correspond to the phase shift auto-transformer in phase. The input end of the phase shift auto-transformer is connected with a grid side power supply, and the two groups of outputs of the phase shift auto-transformer and an output of the three-phase balancing electric reactor are balanced to form a part of the rectifier to supply electricity. The phase shift balancing device of the 18-pulse rectifier consists of a polygonal auto-transformer and the three-phase balancing electric reactor with small capability, calculated capability is about 17% of calculated capability of a traditional extending-edge connecting phase-shifting transformer, materials are saved, product volume and weight are decreased, and the product cost is reduced.

Description

technical field [0001] The invention relates to a transformer, in particular to a phase-shifting balance device for an 18-pulse rectifier. Background technique [0002] With the rapid development of power electronics technology, more and more rectifiers are applied to various fields. Due to the nonlinear characteristics of the rectifier, the grid-side input current is seriously distorted, which reduces the electromagnetic compatibility performance of the equipment and brings harm to the grid and other electrical equipment. Therefore, how to suppress current harmonics is an important task. In the prior art, the characteristics of the input current and output voltage of the rectifier are improved by increasing the number of rectified pulses. The higher the number of pulses, the higher the harmonic order in the input current and output voltage. The transformer in the multi-pulse rectifier is equivalent to a passive filter, which filters out specific harmonics in the output c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/04H01F30/02H01F27/30
Inventor 冉瑞刚
Owner GUANGDONG NRE TECH
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