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Ultrahigh-voltage overhead-cable hybrid power transmission line order parameter measurement method

A technology of mixing lines and sequence parameters, which is applied to measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as inability to accurately calculate, and achieve the effect of high practicability and high accuracy

Active Publication Date: 2016-07-27
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

Due to the different parameters of each section of the hybrid transmission line, the traditional single uniform line parameter calculation method cannot accurately calculate its parameters

Method used

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  • Ultrahigh-voltage overhead-cable hybrid power transmission line order parameter measurement method
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  • Ultrahigh-voltage overhead-cable hybrid power transmission line order parameter measurement method

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Embodiment Construction

[0029] In order to overcome the deficiencies of the existing measurement technology, the present invention provides a method for measuring the sequence parameters of the ultra-high voltage overhead-cable hybrid transmission line, which is suitable for the positive sequence and negative sequence parameters of the overhead line section and the power cable section of the hybrid line. On-line measurement of sequence and zero sequence parameters, and calculation using distribution parameters, so it has high accuracy and practicability.

[0030] In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:

[0031] A method for measuring sequence parameters of EHV overhead-cable hybrid lines, wherein the sequence parameters include positive sequence parameters, negative sequence parameters, and zero sequence parameters. Taking positive sequence parameter measurement as an example, the specific derivation process of t...

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Abstract

The invention relates to an ultrahigh-voltage overhead-cable hybrid power transmission line order parameter measurement method. Positive-order parameter measurement comprises the following steps: system trends change according to demands of a scheduling portion, three-phase voltage and current phasors of the two sides of a hybrid line are obtained through measurement before change and measurement after the change, and positive-order voltages and positive-order currents of the two sides are obtained through the measurement of the two times; T-type equivalent circuit positive-order impedance parameters of the whole hybrid line are solved; T-type equivalent circuit positive-order admittance parameters of an overhead line section and T-type equivalent circuit positive-order admittance parameters of a power cable section are solved; T-type equivalent circuit positive-order impedance parameters of the overhead line section and T-type equivalent circuit positive-order impedance parameters of the power cable section are solved; and positive-order impedance and positive-order admittance parameters of a unit length of an overhead line and a power cable are solved. The measurement method provided by the invention has quite high accuracy.

Description

technical field [0001] The invention relates to the technical field of power system measurement, in particular to a method for measuring sequence parameters of ultra-high voltage overhead-cable hybrid transmission lines. Background technique [0002] EHV overhead-cable hybrid transmission lines have the advantages of economy and reliability in the transmission to urban load centers and across rivers and seas, so they have been widely used and promoted in modern power construction and power grid transformation. Accurate line parameters are the basis for the system to perform power flow calculation, relay protection setting, fault location, etc. The factory parameters of the commonly used lines in the project are calculated, which will inevitably cause large errors. Because after the line is built, the parameters of the line will change with the changes of environmental temperature, climate, soil and other factors, and the line parameters have changed greatly compared with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 李博通张云柯陈晓龙
Owner TIANJIN UNIV
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