Power transmission line parameter identification method and system

A technology for parameter identification and transmission lines, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., and can solve the problems of extracting power frequency components and introducing errors.

Inactive Publication Date: 2018-06-29
CHINA ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, transient data is mainly used for research, and the phasor of voltage and current is used for calculation in the frequency domain. This method will introduce errors when extracting power frequency components, and the identification results will also be affected by factors such as time window position and non-periodic components. influences

Method used

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  • Power transmission line parameter identification method and system
  • Power transmission line parameter identification method and system
  • Power transmission line parameter identification method and system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] figure 1 A flow chart of a transmission line parameter identification method provided by the present invention, such as figure 1 As shown, a transmission line parameter identification method provided by the present invention includes:

[0089] A transmission line parameter identification method provided by the present invention includes:

[0090] Read the double-ended wave recording file of the faulty line to obtain the electrical quantity information at both ends of the faulty line;

[0091] Time synchronization of the electrical quantity information at both ends of the faulty line;

[0092] According to the synchronized double-terminal electrical quantity information of the faulty line, the line parameter identification is carried out, and the reactance identification value is obtained.

[0093] The double-terminal wave recording file of the read fault line is obtained to obtain the double-terminal electrical quantity information of the fault line, including:

[0...

Embodiment 2

[0156] Based on the same inventive concept, the present invention provides a transmission line parameter identification system, which may include:

[0157] The present invention provides a transmission line parameter identification system, including:

[0158] The preprocessing module is used to read the double-terminal wave recording file of the faulty line, and obtain the double-terminal electrical quantity information of the faulty line;

[0159] a synchronization module, configured to time-synchronize the electrical quantity information at both ends of the faulty line;

[0160] The identification module is used to perform line parameter identification according to the synchronized double-terminal electrical quantity information of the faulty line to obtain a reactance identification value.

[0161] The synchronization module includes:

[0162] The coarse alignment sub-module is used to perform rough alignment on the electrical quantity information at both ends of the faul...

Embodiment 3

[0225] The present invention adopts the following technical solutions to achieve.

[0226] (1) Reading and preprocessing of fault recording data

[0227] The reading and preprocessing of fault recording data mainly include two aspects: the reading of double-ended recording information of the fault line of the dispatching master station, and the preprocessing of fault recording data

[0228] 1) Reading of the double-ended wave recording information of the faulty line of the dispatching master station

[0229] According to the COMTRADE file format of ANSI / IEEE Std C37.111-1999 standard, read the fault record file uploaded by the slave station to the master station.

[0230] 2) Preprocessing of fault recording data

[0231] The fault recording records the line operation data when the power grid fails, and the uploaded recording information usually includes the instantaneous value of the double-terminal three-phase voltage and current. Differential Fourier is used to process th...

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Abstract

The invention provides a power transmission line parameter identification method and system. The method comprises the following steps: reading a double-ended wave recording file of a faulty line, andobtaining double-ended electrical quantity information of the faulty line; carrying out time synchronization on the double-ended electrical quantity information of the faulty line; and carrying out line parameter identification according to the synchronized double-ended electrical quantity information of the faulty line, so that a reactance identification value is obtained. By virtue of the technical scheme provided by the invention, power transmission line steady state parameter identification based on fault wave recording data is realized, and synchronization alignment treatment is carried out on the fault wave recording data, so that non-synchronous time of the double-ended wave recording file is shortened, a new means and a good data foundation are provided for accurately identifying power grid branch circuit parameters of a dispatching master station, power grid branch circuit steady state impedance parameter identification accuracy is practically improved, and further the accuracy and availability of a power grid online dispatching analysis software result are improved.

Description

technical field [0001] The invention relates to power system computing technology, in particular to a transmission line parameter identification method and system. Background technique [0002] Improving the accuracy of transmission line parameters is of great significance to the safe operation of lines and systems. At present, the identification of transmission line parameters mainly includes theoretical calculation methods, offline parameter measurement and online parameter measurement methods. Considering that the actual line parameters will change due to factors such as the environment, line transformation, and mutual inductance between lines after being put into operation, online measurement The results of the parameters are closer to the parameters of the actual running line. The online parameter identification method based on PMU is a good identification method at present, but the PMU measurement equipment is mainly deployed in the 500kV main grid plant station and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 陆晓叶昌荣姚建国於益军冯树海张琦兵杨胜春王治华徐鹏刘俊石飞徐田吴海伟卢敏王礼文王勇李峰潘玲玲
Owner CHINA ELECTRIC POWER RES INST
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