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Three-phase three-column transformer modeling method 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: 2015-02-04
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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  • Three-phase three-column transformer modeling method based on EIC principle
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  • Three-phase three-column transformer modeling method based on EIC principle

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Embodiment Construction

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

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

[0038] (1) The nonlinear resistance characterizes the eddy current loss of the transformer core

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

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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-column transformer modeling method based on the EIC principle. Background technique [0002] At present, the modeling of transformers in the electromagnetic transient simulation software is not yet mature. In the process of establishing a three-phase three-column transformer model, some more complicated problems are usually encountered, such as the diversity of core structures, parameters Nonlinear 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, leakage flux, skin effect, winding proximity effect, core saturation, core hysteresis and eddy current loss, capacitance effect, etc. . In order to study the low-frequency transient state and power quality problems of the power system, it is necessary to establish a ...

Claims

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Application Information

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Patent Type & Authority Applications(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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