J-A model parameter test method of current transformer for protection

Abstract

The invention discloses a J-A model parameter test method of a current transformer for protection. The method comprises model parameter identification, multi-transient state dynamic test, current transformer simulation, error function evaluation and the like and can judge whether identified J-A model parameters of the current transformer are in line with actual needs. According to the J-A model parameter test method of the current transformer for protection provided by the invention, test and simulation are combined, and therefore, the defects of the identified parameters caused by intelligent algorithms or experimental conditions can be effectively discovered. With the method adopted, whether the transformation properties of the current transformer which are reflected by the model parameters of the current transformer are consistent with actual conditions can be verified under typical power system fault transient state conditions; and suggestions for judging whether the model parameters of the current transformer accord with actual requirements can be provided from the aspect of application, and therefore, a sound foundation can be conveniently laid for the guidance of accident analysis of a site and protection responsive strategies from the perspective of simulation.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and more specifically relates to a method for checking J-A model parameters of a current transformer for engineering protection based on dynamic model test and digital simulation. Background technique [0002] With the development of HVDC transmission technology and flexible power electronics technology, my country's power grid is gradually becoming a high-density AC-DC hybrid power grid with large scale, complex structure and flexible operation mode. In order to ensure power transmission and performance, a large number of non-linear ferromagnetic components with various structures are configured in the power grid, such as transformers and current transformers. The transient process of the power grid also becomes more and more complicated. In recent years, during the transient process of the power system, there have been many accidents in the power grid due to the ...

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Problems solved by technology

Secondly, to identify the parameters of the model, it is necessary to use the test to measure the hysteresis loop of the current transformer first. The error of the test may also cause a slight deviation in the identified parameters, resulting in the identification of the parameters of the J-A model of the current transformer, which cannot be completely accurate and intuitive. For the transmission characteristics of real current transformers, there is an urgent need for a method that can test the accuracy of J-A model parameters of current transformers

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