Transformer positive sequence parameter identification method and device based on current change recording data

Abstract

The invention discloses a transformer positive sequence parameter identification method and device based on current change recording data. The method comprises the steps of: building a transformer inverted an inverted-L-shaped equivalent model, and carrying out deformation processing on the transformer inverted-L-shaped equivalent model according to the disturbance data in the operation of a transformer so as to obtain a transformer positive sequence equivalent model based on the current change recording data; and decoupling the data on the two sides of the transformer, performing weighted least square solution on the transformer transformation ratio and excitation admittance based on the current change recording data by using the data before and after the current change, and calculating to obtain the positive sequence parameters of the transformer. On-line calculation of the positive sequence parameters of the transformer is carried out by using the current change recording data. According to the method, the redundancy of sampling data under different operation conditions is fully utilized, and the positive sequence parameters of the transformer are identified and calculated. With the method adopted, large errors of nameplate calculation parameters can be overcome, and parameter inconsistency caused by changes of transformer taps can be reduced. The method has good practicability.

Description

technical field [0001] The invention relates to the technical field of transformer positive sequence parameter identification, in particular to a transformer positive sequence parameter identification method and device based on current change recorded wave data. Background technique [0002] The accuracy of transformer positive sequence parameters is directly related to the accuracy and credibility of various calculation and analysis results of the power system. Changes in the actual operating environment, changes in the tap position of the transformer, and other information are different, resulting in deviations in transformer parameters. [0003] Based on the development of smart substations based on the IEC61850 standard, the digital sampling of each interval in the substation remains strictly synchronized. However, the existing transformer positive sequence parameters are mainly obtained from nameplate theoretical values. Considering that there are certain differences i...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing transformer positive sequence parameters are mainly obtained through nameplate theoretical values, considering that there are certain differences in parameters and transformation ratios in actual operation; the variability of parameters in actual operation cannot be effectively tracked, There are problems such as large errors in the calculation of transformer positive sequence parameters

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