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Accurate measurement method for zero-sequence distribution parameters of three-circuit non-whole-line parallel power transmission line

A transmission line, accurate measurement technology, applied in radio wave measurement system, capacitance measurement, impedance measurement and other directions, can solve problems such as inability to use long-distance transmission lines, complex coupling of three-circuit lines, and difficulty in accurate measurement of line parameters.

Pending Publication Date: 2021-08-27
WUHAN UNIV
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Problems solved by technology

The input of three-circuit lines can make up for the insufficient power supply of single-circuit lines and double-circuit lines. However, the coupling of three-circuit lines is complicated, which brings great difficulty to the accurate measurement of line parameters.
The method based on the centralized parameter model cannot be applied to long-distance transmission lines, while the method based on the distributed parameter model is currently only applicable to parallel lines on the same tower

Method used

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  • Accurate measurement method for zero-sequence distribution parameters of three-circuit non-whole-line parallel power transmission line
  • Accurate measurement method for zero-sequence distribution parameters of three-circuit non-whole-line parallel power transmission line
  • Accurate measurement method for zero-sequence distribution parameters of three-circuit non-whole-line parallel power transmission line

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Embodiment Construction

[0123] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0124] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0125] The present invention will be further described below in conjunction with specific examples, but not as a limitation of the present invention.

[0126] In order to solve the disadvantages existing in the prior art that the centralized parameter model cannot be applied to long-distance transmission line...

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Abstract

The invention relates to an accurate measurement technology for zero-sequence distribution parameters of a power transmission line, in particular to an accurate measurement method for zero-sequence distribution parameters of a three-circuit non-whole-line parallel power transmission line. The method comprises the steps of completely obtaining a transmission matrix of the line by utilizing Laplacian transformation, by being matched with a synchronous measurement technology, synchronously measuring voltage and current of the head end and the tail end of the non-whole-line parallel power transmission line in four independent measurement modes, and substituting into a measurement calculation formula, thereby being capable of accurately solving 15 zero-sequence distribution parameters including zero-sequence resistance, zero-sequence inductance and zero-sequence capacitance. The method is suitable for a three-circuit non-whole-line parallel line with any line length and any voltage level in the form. Meanwhile, the measurement method also solves the problem of simultaneity of remote signal measurement by using a GPS technology; and a plurality of zero-sequence distribution parameters such as zero-sequence resistance, zero-sequence inductance and zero-sequence capacitance can be measured at one time, and the measurement precision is not lower than that of a measurement method which only measures one of the zero-sequence distribution parameters.

Description

technical field [0001] The invention belongs to the technical field of precise measurement of zero-sequence distribution parameters of transmission lines, and in particular relates to a method for precise measurement of zero-sequence distribution parameters of three-circuit non-full-line parallel transmission lines. Background technique [0002] With the rapid development of society, the demand for electricity is increasing day by day, and the transmission network is also expanding accordingly. Accurate measurement of line parameters is an important guarantee for transmission line distance protection, fault location, and short-circuit calculation, and is crucial to the safe and stable operation of the power grid. The theoretical calculation of transmission line parameters based on soil resistivity is affected by the uncertainty of environmental factors, making it difficult to guarantee the calculation accuracy of line parameters. Therefore, the power industry stipulates that...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/04G01R27/08G01R27/16G01R27/26G01S19/25
CPCG01R27/04G01R27/08G01R27/16G01R27/2605G01R27/26G01S19/256
Inventor 胡志坚高明鑫刘妍
Owner WUHAN UNIV
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