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A Modeling Method for General Model of Three-phase Magnetic Leakage Admittance Matrix of Power Transformer

A technology of power transformers and general models, applied in the fields of instruments, electrical digital data processing, special data processing applications, etc.

Active Publication Date: 2017-11-21
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are technical difficulties. First, how to quantify the wiring mode of the winding into parameters; second, how to obtain a general model of the three-phase flux leakage admittance matrix of the transformer including the parameters of the winding wiring mode and the phase shift angle.

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  • A Modeling Method for General Model of Three-phase Magnetic Leakage Admittance Matrix of Power Transformer

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Embodiment Construction

[0066] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0067] The terms and definitions of the present invention are explained as follows:

[0068] 1) The wiring mode of the transformer winding: refers to the three ways of Y (star ungrounded), Yn (star grounded, including grounding through impedance) and D (delta).

[0069] 2) Transformer phase shift angle: refers to the value that the phase voltage angle of the secondary side of the transformer is ahead of the phase voltage angle of the primary side.

[0070] 3) Transformer three-phase flux leakage admittance matrix: It is a key part of the transformer three-phase detailed model, including iron loss, winding connection mode and transformer phase shift.

[0071] 4) Sequence component: divided into positive sequence, negative sequence and zero sequence. Positive sequence: phase A leads phase B by 120 degrees, phase B leads ...

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Abstract

The invention relates to a method for determining a general model of a three-phase magnetic leakage admittance matrix of a power transformer. The method comprises the following steps: (1) determining a transformer three-sequence model based on parameterization of a transformer connection mode; (2) determining a transformer three-sequence circuit equation and three-sequence node admittance matrix with the parameters of the transformer connection mode; (3) determining the transformer three-phase magnetic leakage admittance matrix with the parameters of the transformer connection mode; (4) determining the general model of the transformer three-phase magnetic leakage admittance matrix with a phase-shifting angle and the parameters of the transformer connection mode; (5) verifying the general model of the transformer three-phase magnetic leakage admittance matrix. For one given actual transformer, a parameter value corresponding to a connection mode of a winding and the phase-shifting angle of the transformer are substituted into the general model, the corresponding three-phase magnetic leakage admittance matrix can be obtained, and therefore, one-by-one derivation for various transformers is avoided. The method has general universality and brings convenience for program implementation and engineering application.

Description

technical field [0001] The invention relates to a method in the field of power distribution automation, in particular to a modeling method for a general model of a power transformer three-phase flux leakage admittance matrix. Background technique [0002] With a large number of distributed energy resources (DER) connected to the distribution network, the operation mode of the distribution network becomes relatively complex, so the calculation and analysis of the multi-voltage level distribution network is not only necessary but also complicated. The establishment of a transformer three-phase model is very critical for the calculation and analysis of the state estimation, power flow calculation and short-circuit current calculation of the three-phase unbalanced system of the multi-voltage level distribution network, because it is directly related to the rationality of the calculation results. [0003] In engineering applications, the three-phase detailed model of the transfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 王少芳刘广一郎燕生王少毅刘升黄仁乐李理杨占勇邢颖
Owner STATE GRID CORP OF CHINA
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