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A modeling method of three-phase three-column transformer based on eic principle

A three-phase, three-column, modeling method technology, applied in the direction of instruments, electrical digital data processing, special data processing applications, etc., can solve problems such as low precision and complex models

Active Publication Date: 2017-09-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide a three-phase three-column transformer model, based on the principle of equivalent differential magnetic circuit, to solve the problem that the existing model is too complicated or the accuracy is not high, in order to accurately calculate the low-frequency transient state of the transformer and study the power quality problem , Reliably evaluate the transformer's ability to withstand DC bias, and then provide a basis for determining effective and reasonable control measures

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  • A modeling method of three-phase three-column transformer based on eic principle
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  • A modeling method of three-phase three-column transformer based on eic principle

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Embodiment Construction

[0036] A three-phase three-leg transformer modeling method based on the EIC principle, the specific analysis of each step and the solution of the relationship are as follows:

[0037] 1. Based on the three-phase three-leg transformer core topology and transformer parameters, establish the corresponding circuit model;

[0038] (1) Non-linear resistance characterizes the eddy current loss of the transformer core

[0039] The magnetic flux of the transformer core is constantly changing, and the changing magnetic field will induce electromotive force in the core and generate currents. These currents flow in an eddy current around the magnetic flux inside the core, called eddy currents. figure 2 The schematic diagram of the iron core lamination, the length of the iron core lamination is , The thickness is , The cross-sectional area is , Is the width of the lamination, Is the conductivity, Is the magnetic induction intensity.

[0040] According to Bertotti theory, the instantaneous po...

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Abstract

The invention provides a three-phase three-column transformer modeling method based on an EIC principle. The method comprises the steps of establishing a corresponding circuit model and a differential magnetic circuit model based on the core topological structure of a three-phase three-column transformer and the parameters of the transformer, deriving a differential inductance matrix, establishing a three-phase three-column transformer bank circuit model, solving a transformer differential circuit equation set according to a numerical algorithm, gaining target variables and establishing an accurate and practical transformer time-domain simulation model. A three-phase three-column transformer model provided according to the method can be used for accurately calculating a low-frequency transient state of the transformer, conducting electric energy quality problem researches, reliably evaluating the direct-current magnetic biasing resistance of the transformer, providing a basis for determining effective and reasonable control measures and providing a basis for power system planning design and equipment type selection.

Description

Technical field [0001] The invention relates to the technical field of transformer modeling methods, in particular to a three-phase three-leg transformer modeling method based on the EIC principle. Background technique [0002] At present, the modeling of transformers in electromagnetic transient simulation software is not yet mature. In the process of establishing a three-phase three-leg transformer model, some more complicated problems are usually encountered, such as the diversity of iron core structures and parameter Non-linear and frequency-dependent characteristics, as well as many physical quantities that need to be accurately represented, such as self-inductance and mutual inductance between windings, magnetic flux leakage, skin effect, winding proximity effect, iron core saturation, iron core hysteresis and eddy current loss, capacitance effect, etc. . In order to study the low-frequency transient and power quality problems of the power system, it is necessary to establ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 李文峰白宏坤刘永民王江波李虎军杨萌
Owner STATE GRID CORP OF CHINA
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