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Power transmission line parameter identification method based on PMU (phasor measurement unit) data

A technology for parameter identification and transmission lines, which is applied in the direction of measuring electricity, measuring electrical variables, complex mathematical operations, etc. It can solve the problems that the parameter calculation results deviate from the real value and cannot weaken the influence of measurement errors, so as to achieve good engineering application value, The effect of weakening the influence

Inactive Publication Date: 2017-02-22
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

However, considering the ubiquity of measurement errors in power grid system measurement devices, the direct method cannot weaken the influence of measurement errors on parameter calculation results. In the case of serious measurement errors, the parameter calculation results will greatly deviate from the true value.

Method used

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  • Power transmission line parameter identification method based on PMU (phasor measurement unit) data
  • Power transmission line parameter identification method based on PMU (phasor measurement unit) data
  • Power transmission line parameter identification method based on PMU (phasor measurement unit) data

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Effect test

Embodiment

[0073] attached figure 1 It is an implementation flowchart of the PMU data-based transmission line parameter identification and calculation method proposed by the present invention.

[0074] attached figure 2 It is the π-type equivalent circuit and measurement system of the transmission line. The measurement of the PMU device mainly includes the voltage phasor measurement at the head and end of the line, the current phasor measurement at the head and end, and the active and reactive power measurement of the head and end branches.

[0075] Table 1 Identification results of multi-section parameters of transmission lines

[0076]

[0077] Table 1 shows the parameter identification results of three lines in a provincial network system based on PMU data, where the reference value represents the actual given parameters, and the average value of the direct method represents the average value of the parameters obtained by the direct method after the section is screened in step 5 ...

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Abstract

The invention discloses a power transmission line parameter identification method based on PMU (phasor measurement unit) data, and aims to solve the problem of power transmission line parameter identification based on the PMU (phasor measurement unit) data. Compared with a direct parameter calculation method based on the PMU data, the method can weaken the influence of measured noise and provide more real line parameter identification results. The method includes the steps: firstly, preliminarily processing the PMU measured data in a certain time period; secondly, identifying single sampled sections one by one based on a weighted least square method to further remove non-convergent invalid sections in single section identification; thirdly, performing multi-section parameter identification for remaining valid sections to finally obtain parameter identification results of a power transmission line. Power transmission line parameter identification based on the PMU data can be effectively realized, and the method has a good engineering application value.

Description

technical field [0001] The invention relates to a method for identifying parameters of transmission lines based on PMU data, belonging to the field of power system analysis and calculation. [0002] technical background [0003] The accuracy of transmission line parameters is the basis of various power grid analysis and calculation software. When the network parameters change, if the network parameter identification, estimation and correction are not carried out, the accuracy and reliability of the power system state estimation will be directly affected. In extreme cases, excessive parameter errors may even lead to non-convergence of state estimation. There are many factors that affect transmission line parameters, such as geographical environment, temperature, humidity, sag, operating conditions, line aging, etc. These factors cause the actual parameters of transmission lines to change constantly, so it is necessary to carry out transmission line parameters identify. [0...

Claims

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Application Information

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IPC IPC(8): G01R31/00G06F17/18
CPCG01R31/00G06F17/18
Inventor 卫志农陈醒孙国强臧海祥
Owner HOHAI UNIV
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