Method for identifying capacitive voltage transformer model based on short line slotted model and least-squares method

Abstract

The invention relates to a method for identifying a capacitive voltage transformer model based on a short line slotted model and a least-squares method, and belongs to the technical field of voltage transformer modeling and identification. At present, there are mainly two methods for verifying broadband characteristics of voltage transformers, one is off-line monitoring, whereby the test accuracycan be ensured but the economic cost is high, and the other is the use of a theoretical simulation model to analyze the impact of parameters on the test, whereby the test accuracy cannot be guaranteed. The method of the invention includes the steps of first, establishing a short line slotted model; 2, writing a theoretical line loss calculation formula for the short line slotted model, and calculating the theoretical line loss; 3, according to measured values on both sides of a line in the short line slotted model, writing a corresponding observation line loss calculation formula, and calculating the observation line loss; 4, based on theoretical line loss and observation line loss, writing an algebraic equation of the transformer model; and 5, solving the algebraic equation by applying the least-squares method and obtaining model parameters for the transformer.

Description

technical field [0001] The invention relates to a model identification method of a capacitive voltage transformer based on a short line in-line model and a least square method, and belongs to the technical field of modeling and identification of voltage transformers. Background technique [0002] With the rapid expansion of the grid scale, the proportion of power electronic devices in the power system is getting higher and higher. Because of their own characteristics, power electronic devices inject a large number of harmonics into the power grid, and power quality monitoring and governance have also become important issues. The investment in power quality monitoring equipment brings convenience to power grid monitoring, but because the voltage transformers in the early construction of the power grid are designed based on fundamental wave monitoring, for the monitoring of harmonic frequency bands, conventional voltage transformers cannot meet the national standard accuracy re...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, and provide a kind of capacitive voltage transformer model identification method based on the short line in-line model and the least squares method of reasonable design, the short line in-line model based on the short circuit The capacitive voltage transformer model identification method based on the model and the least squares method overcomes the shortcomings of the above-mentioned prior art, and can effectively solve the problem that the existing voltage transformer identification method cannot take into account both price and accuracy

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