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Single-phase three-winding autotransformer model taking account of nonlinear influences of excitation impedance

An autotransformer, excitation impedance technology, applied in the field of transformers

Inactive Publication Date: 2013-03-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no single-phase three-winding autotransformer model considering the nonlinear influence of excitation impedance, and the present invention is to solve this technical problem

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  • Single-phase three-winding autotransformer model taking account of nonlinear influences of excitation impedance
  • Single-phase three-winding autotransformer model taking account of nonlinear influences of excitation impedance
  • Single-phase three-winding autotransformer model taking account of nonlinear influences of excitation impedance

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Embodiment Construction

[0084] The invention provides a single-phase three-winding autotransformer model considering the nonlinear influence of excitation impedance.

[0085] figure 1 is the positive direction of each physical quantity of the single-phase three-winding step-down autotransformer according to the convention. In the figure, (a) is a schematic diagram, and (b) is an equivalent circuit diagram. When running with no load, the primary winding W 1 The no-load current flowing through the power supply is It produces an unloaded magnetic potential Establish the main magnetic flux φ in the iron core m . φ m In the high voltage winding W 1 The induced potential is where the series winding (W 1 -W 2 ) part of the induced potential Common winding W 2 Part of the induced potential is Low voltage winding W 3 Part of the induced potential is E 3 . The relationship between the induced potentials of each winding is:

[0086] E 1 ...

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Abstract

The invention discloses a single-phase three-winding autotransformer model taking nonlinear influences of excitation impedance into consideration, which belongs to the technical field of transformers. The single-phase three-winding auto-transformer model comprises a basic electric circuit and magnetic circuit equation of a single-phase three-winding step-down autotransformer, an equivalent circuit of a single-phase three-winding autotransformer, an equivalent circuit of a single-phase three-winding step-up autotransformer, an expression of an excitation impedance zm and an expression of the single-phase three-winding autotransformer model taking account of the nonlinear influences of the excitation impedance. The autotransformer model not only takes account of the magnetic coupling between a high-voltage winding and a medium-voltage winding but also takes account of the electrical relationship, and the result of a harmonic characteristic simulation performed by the single-phase three-winding autotransformer model is more actual than that of the harmonic characteristic simulation performed by a common three-winding transformer instead of the three-winding autotransformer. The excitation impedance not only comprises generally non-ignorable nonlinear inductance reflecting iron core saturation characteristics, but also takes account of the nonlinear resistance reflecting iron losses, and the harmonic characteristic of a transformer can be analyzed more accurately by using the excitation impedance.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a single-phase three-winding autotransformer model considering the nonlinear influence of excitation impedance. Background technique [0002] The most common ones in the power system are three-phase and single-phase three-winding autotransformers, and ultra-high (ultra) high-voltage giant-capacity autotransformers are generally single-phase. The main considerations are transportation restrictions, the incompatibility between the outer insulation distance of the transformer and the inner insulation distance, saving investment when spare parts are available, and not using three-phase transformers. [0003] The harmonic level not only affects the safe operation of the power grid, but is also closely related to the network loss. Reducing the harmonic level of the power grid can effectively reduce the network loss. Therefore, conducting in-depth research on the harmonic problems...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50H01F30/02H01F41/00
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 岳昊徐永海朱永强肖湘宁刘颖英
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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