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A method for measuring the accuracy of power line parameters

A technology of parameter accuracy and power lines, applied in the field of power system parameter identification, can solve problems such as deviation of transmission line parameters from accurate values, data measurement and measurement transformers, digital sampling, Fourier transform errors, and inconsistent operating conditions, etc., to achieve The design principle is reliable, the application range is wide, and the effect of high calculation efficiency

Inactive Publication Date: 2017-04-12
国家电网有限公司华北分部 +1
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AI Technical Summary

Problems solved by technology

[0005] The accuracy of transmission line identification parameters is affected by the quality of PMU data. There are many reasons for the instability of PMU data quality: First, the measured data cannot reflect the normal operation of the system due to faults such as subsynchronous oscillation and low-frequency oscillation in the power system Second, there are errors in the measurement transformer, digital sampling, Fourier transform, digital filtering and other links in the data measurement and processing link, which makes the data used for parameter identification different from the actual data
The PMU data error causes the identified transmission line parameters to deviate from the accurate value, making the state estimation, power flow analysis, line loss calculation, etc. inconsistent with the actual operating conditions, and adversely affecting the analysis and control of the power system

Method used

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  • A method for measuring the accuracy of power line parameters
  • A method for measuring the accuracy of power line parameters
  • A method for measuring the accuracy of power line parameters

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Embodiment

[0023] This embodiment is used as a specific case of actual measurement and determination. During implementation, first identify the parameters of the uniform transmission line, figure 1 To plot the input voltage phasor of a uniform transmission line current phasor Phasor with output voltage current phasor Schematic diagram of the positive direction; in power systems, uniform transmission lines are often used figure 2 In the π-type equivalent circuit shown, where Y is the admittance and Z is the impedance, the uniform transmission line model is expressed by the following formula:

[0024]

[0025] For the binary linear equation of the above-mentioned complex variable, through a certain point in time Find the exact solution of the parameters directly

[0026]

[0027] Since the measured PMU data directly gives the voltage phasor and current phasor at both ends of the transmission line, the above parameter expression is also called the parameter identification...

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Abstract

The invention belongs to the technical field of electrical power system parameter identification, and relates to a measurement method of electric power line parameter accuracy influenced by data errors. According to the method, influence of parameters of an equivalent circuit of a power transmission line on PMU (phase measurement unit) data sensitivity is determined, sensitivity of line parameters to PMU data errors is judged, a parameter accuracy calculation method is given, the quantitative influence degree of each data to power line parameters is judged according to the quantitative relation between data error increment and parameter deviation, and the measured PMU data quality and the parameter identification accuracy are improved. The design principle is reliable, scientificity of the judgment technology is high, the accuracy is high, quantification is accurate, the application range is wide, and the measurement efficiency is high.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of power system parameter identification, and relates to a method for measuring the accuracy of power line parameters affected by data errors, in particular to a method for measuring the deviation of power line identification parameters when PMU (synchronous phasor measurement unit) data errors occur. value method. [0003] Background technique: [0004] The accuracy of equivalent circuit parameters of uniform transmission lines is directly related to application functions such as power system power flow analysis, state estimation, fault location, relay protection setting, transient and dynamic stability calculations. With the development of wide-area measurement systems in power systems And the wide application of PMU, identifying the parameters of the power system model from the measured PMU data is an effective way to obtain the actual value of the parameters. The measured PMU data can give the eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 王茂海牛四清张哲吴新振
Owner 国家电网有限公司华北分部
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