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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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

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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[0072] Example

[0073] Attached figure 1 It is an implementation flow chart of the method for identifying and calculating transmission line parameters based on PMU data 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 line head and end voltage phasor measurement, the head and end current phasor measurement, and the head and end branch active and reactive power measurement.

[0075] Table 1 Multi-section parameter identification results 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 parameter, and the direct method average represents the parameter average obtained by the direct method after the section is screened in step 5. Value, the multi-section parameter identificatio...

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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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