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.
CN104252567AActive Publication Date: 2014-12-31STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2014-12-31

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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.
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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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