Harmonic transmission modeling method of electromagnetic current transformer

A technology of current transformer and modeling method, which is applied in the fields of instruments, electrical digital data processing, special data processing applications, etc., can solve the problems of needing a lot of sample data, inability to simulate accurate current transformers, and complicated modeling.

Active Publication Date: 2016-02-03
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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Problems solved by technology

However, the improved model and the classic J-A model cannot be accurately used for the simulation of current transformers under the condition of harmonics
[0011] Using artificial intelligence algorithms such as neural netwo

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  • Harmonic transmission modeling method of electromagnetic current transformer
  • Harmonic transmission modeling method of electromagnetic current transformer
  • Harmonic transmission modeling method of electromagnetic current transformer

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Embodiment Construction

[0052] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0053] The invention provides a modeling method for harmonic transmission of electromagnetic current transformers, such as figure 1 As shown, follow the steps below to achieve:

[0054] Step S1: Acquire the primary side harmonic current signal of the current transformer, detect the effective value of the primary side harmonic current signal and the residual magnetism M of the current transformer r ;

[0055] Step S2: Obtain hysteresis loop parameters in the hysteresis loop model related to the current frequency change on the primary side of the current transformer;

[0056] Step S3: After the current signals of different frequencies on the primary side are transmitted through the improved J-A hysteresis loop model, the fast Fourier algorithm is used to calculate and obtain the power frequency fundamental wave and harmonic components of ...

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Abstract

The invention relates to a harmonic transmission modeling method of an electromagnetic current transformer. The harmonic transmission modeling method comprises the following steps: obtaining a primary-side harmonic current signal of the current transformer, detecting a primary-side harmonic current effective value and circuit transformer remanence, ensuring that a hysteresis loop model based on improved J-A is the hysteresis loop model associated with primary current frequency change information, obtaining secondary current corresponding to each component signal of a secondary side of the current transformer after hysteresis loop model transmission is carried out, obtaining an effective value generated after the secondary current is transmitted, and calculating the ratios of transformation of the current transformer under different frequencies. The harmonic transmission modeling method which is put forward by the invention can realize conversion simulation from primary current to secondary current under different frequencies, and improves metering and measurement accuracy under a harmonic condition.

Description

technical field [0001] The invention relates to the fields of power electronics and power quality measurement, in particular to a modeling method for harmonic transmission of electromagnetic current transformers. Background technique [0002] Electromagnetic current transformer is an important electrical equipment in the power system, which transmits and transforms primary current signals for metering, measurement, and protection equipment. Since the electromagnetic current transformer is affected by the hysteresis loop, the electromagnetic current transformer will enter the saturation section of the hysteresis loop and cause secondary current distortion. With the large number of applications of power electronic equipment such as air conditioners, UPS, and electric arc furnaces, there are harmonic sources of different frequencies in the distribution network of 35kV and below, which seriously affect the power quality of public connection points. The traditional current trans...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 邵振国林焱吴丹岳陈利翔黄道姗张嫣
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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