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Three-phase system and single-phase system online conversion device

A single-phase system and three-phase technology, applied in the field of power systems, can solve problems such as harmonics and negative sequence component power system hazards

Inactive Publication Date: 2013-05-08
孟庆良
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Problems solved by technology

[0002] With the expansion of power load components, three-phase systems generally face more difficult problems in the balance control of unbalanced loads between phases. The large number of single-phase loads represented by electrified railways are connected to three-phase power systems. The generated harmonics and negative sequence components will cause considerable harm to the power system, and the three-phase system is currently facing a more severe test

Method used

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  • Three-phase system and single-phase system online conversion device
  • Three-phase system and single-phase system online conversion device
  • Three-phase system and single-phase system online conversion device

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Embodiment Construction

[0026] 1. On the three-phase secondary closed loop formed by the triangular winding of the ordinary three-phase power transformer, open one of the phases and connect the phase to the position of the phase to determine the output target phase of the single-phase AC;

[0027] 2. Adjust the number of turns of the other two phases (non-target phases) of the secondary single-phase output so that the number of turns of the non-target phase of the secondary single-phase output is twice the target phase;

[0028] 3. Two corresponding dynamic reactive power compensation devices Xc and XL are respectively connected across the two non-target phases. The reactive power compensation device can fully compensate the reactive components of the non-target phases during the phase combination process. , when the three-phase system and the single-phase system directly exchange electric power online, it meets the requirements of the symmetry of the three-phase system operation. refer to image 3 ....

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Abstract

The three-phase system and single-phase system online direct interconnection technique relates to a power system. Turns and wiring methods of a three-phase transformer are changed based on the three-phase transformer. A split-phase dynamic reactive power compensation equipment is utilized to enable the three-phase system and single-phase system online conversion device to be directly connected with an independent three-phase system and an independent single-phase system. Requirements for guaranteeing running symmetry degree of the three-phase system can be met when two systems are in power exchange, and harmonious interdependence relation between the three-phase system and the single-phase system can be established.

Description

technical field [0001] A device for realizing direct on-line conversion between a three-phase system and a single-phase system relates to an electric power system. Background technique [0002] With the expansion of power load components, three-phase systems generally face more difficult problems in the balance control of unbalanced loads between phases. The large number of single-phase loads represented by electrified railways are connected to three-phase power systems. The generated harmonics and negative sequence components will cause considerable harm to the power system, and the three-phase system is currently facing a more severe test. The present invention is based on the analysis of the working characteristics of ordinary three-phase power transformers, according to the principle of electromagnetic induction and vector superposition principle, supplemented by a reasonable reactive power phase separation compensation scheme, a "special transformer" system is designed,...

Claims

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Application Information

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IPC IPC(8): H02M5/14
Inventor 孟庆良孟繁瑞刘丹舟潘大志郭厚静
Owner 孟庆良
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