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A zero-sequence parameter calculation method and system based on the characteristic equation of a double-circuit line

A technology of zero-sequence parameters and double-circuit lines, which is applied in the field of transmission line parameter identification, can solve the problems of complex transmission line parameters and power system influence, and achieve the effect of simple principle, small identification error and high fault tolerance

Active Publication Date: 2021-01-26
GUANGDONG POWER GRID CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the transmission line parameters used in the work are inaccurate, it may have a great impact on the power system, and even cause major power accidents
Transmission line parameters are often complex and affected by many uncertain factors (climate, environment, geography, etc.), making it impossible to obtain accurate values ​​of these parameters only by theoretical calculations

Method used

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  • A zero-sequence parameter calculation method and system based on the characteristic equation of a double-circuit line
  • A zero-sequence parameter calculation method and system based on the characteristic equation of a double-circuit line
  • A zero-sequence parameter calculation method and system based on the characteristic equation of a double-circuit line

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Comparison scheme
Effect test

Embodiment 1

[0032] Please refer to the attached figure 1 , is a schematic flowchart of a method for calculating zero-sequence parameters based on the characteristic equation of a double-circuit line provided in Embodiment 1 of the present invention. The method specifically includes the following steps:

[0033] S1. Establish the overdetermined equations before and after the fault, and solve the out-of-sync angles at both ends of the line according to the overdetermined equations.

[0034] S2. Perform Fourier transform on the sampled asynchronous voltage and current data at both ends of the line to obtain the fundamental wave vector of the voltage and current at both ends.

[0035] S3. Decompose the fundamental wave vector obtained in step S2 into sequence components by using the symmetrical component method, and establish the zero-sequence coupling equations of the doubly-fed line simultaneously.

[0036] S4. Solve the set of zero-sequence coupling equations of the doubly-fed line, and u...

Embodiment 2

[0085] Please refer to the attached Figure 4 , is a schematic structural diagram of a zero-sequence parameter calculation system based on the characteristic equation of double-circuit lines provided in Embodiment 2 of the present invention. The system specifically includes the following modules:

[0086] The first calculation module 41 is used to establish the overdetermined equations before and after the fault, and solve the out-of-sync angles at both ends of the line according to the overdetermined equations;

[0087] The first processing module 42 is used to perform Fourier transform on the sampled asynchronous voltage and current data at both ends of the line to obtain the fundamental wave vector of the voltage and current at both ends;

[0088] The second processing module 43 is used to decompose the fundamental wave vector obtained in step S2 into sequence components by using the symmetrical component method, and establish a double-fed line zero-sequence coupling equati...

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Abstract

The invention discloses a zero-sequence parameter calculation method and a zero-sequence parameter calculation system based on a double-circuit line characteristic equation. The zero-sequence parameter calculation method comprises the steps of: S1, establishing an over-determined equation set before and after a fault, and solving asynchronous angles at two ends of a line according to the over-determined equation set; S2, performing Fourier transform on asynchronous voltage and current data at two ends of the line obtained through sampling, so as to obtain voltage and current fundamental wave vectors at two ends; S3, decomposing the fundamental wave vectors obtained in the step 2 into sequence components by adopting a symmetrical component method, and establishing a double-feed line zero-sequence coupling equation set simultaneously; S4, and solving the double-feed line zero-sequence coupling equation set, and calculating line zero-sequence parameters by utilizing the sequence componentdata obtained in the step S3 respectively. The zero-sequence parameter calculation method and the zero-sequence parameter calculation system based on the double-circuit line characteristic equation have the advantages of simple principle and high fault tolerance, have small identification errors when the asynchronous angles are gradually increased and mutual inductance exists between the double-circuit lines, and have high precision.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of transmission line parameter identification, in particular to a method and system for calculating zero-sequence parameters based on characteristic equations of double-circuit lines. Background technique [0002] The power system model and parameters are the basis for accurate calculation of the power system, and parameter errors are a difficult problem that plagues power system calculations; due to various reasons, incorrect power system parameter values ​​and parameter errors will seriously affect the accuracy of power system calculations, resulting in analysis and calculation errors. The results are seriously inconsistent with reality. [0003] The transmission line is the carrier of power transmission and one of the main components of the power system, which plays an extremely important role in the power system. The mathematical model of the power system requires line parameters, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G06F17/12
CPCG01R31/088G06F17/12
Inventor 陈志光焦邵麟黄明辉曾耿晖李一泉刘玮陈桥平马永斌李琨杨常府詹庆才魏佳王丽伟
Owner GUANGDONG POWER GRID CO LTD