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Method for improving power grid stable section measurement precision through improving data synchronism

A technology with measurement accuracy and data synchronization, which is applied in the measurement of electricity, measurement devices, and measurement of electricity variables, etc., and can solve problems such as errors in the measurement of transmission grid sections and inaccurate analysis data for grid security and stability.

Active Publication Date: 2017-02-08
DANDONG ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +2
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Problems solved by technology

[0003] The invention provides a method for improving the measurement accuracy of the stable section of the power grid by improving the synchronization of data, which solves the problems of errors in the measurement of the section of the transmission network and inaccurate analysis data of the safety and stability of the power grid.

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  • Method for improving power grid stable section measurement precision through improving data synchronism
  • Method for improving power grid stable section measurement precision through improving data synchronism
  • Method for improving power grid stable section measurement precision through improving data synchronism

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Embodiment 1

[0041] Such as Figure 1-3 As shown, by improving the data synchronization to improve the measurement accuracy of the stable section of the power grid, the stable section data is composed of 5 measurement points, and the specific values ​​are shown in Table 1. Table 1 shows the stable section data of the 5 selected measurement points, and the data refresh frequency Set to 10 frames / min, the measurement value obeys a normal distribution with a standard deviation of 0.02 and an error mean of 0; its measurement delay obeys a normal distribution with a standard deviation of 0.1s and a mean of 0.1, and 5 measurements of stable section data The measured rate of change of a point is as figure 1 As shown in the figure, CASE-1 is the unoptimized section measurement, and CASE-2 is the optimized section measurement.

[0042] Table 1

[0043]

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Abstract

The invention discloses a method for improving power grid stable section measurement precision through improving data synchronism. The method of the invention comprises steps of (1) obtaining a measurement value of a segment time sequence of a stable section composition node, wherein the measurement value comprises a voltage magnitude, a current magnitude and a power value; (2) obtaining a measurement value of a segment time sequence of a PMU which is closer to the stable section composition node, wherein the measurement value comprises a voltage magnitude, a current magnitude and a power value; (3) calculating a correlation coefficient matrix Rhosw of common measurement zs and PMU measurement zw; 4) solving a standard measurement moment t of a measurement set according to the correlation coefficient matrix Rhosw; and 5) obtaining an accurate output power grid stable section measurement value according to the standard measurement moment time t. The beneficial effect of the invention are that the method of the invention can reduce the error of the power transmission grid section measurement through synchronizing measurement data, provides relatively correct data to power grid safety analysis, reduces margins reserved by the power grid stability control measurements and improves a power grid utilization rate.

Description

technical field [0001] The invention relates to a method for improving the measurement accuracy of a stable section of a power grid, in particular to a method for improving the measurement accuracy of a stable section of a power grid by improving data synchronization. Background technique [0002] The measurement of the stable section of the transmission network is the basis for the safety and stability of the power system, and the control of the power system about the transmission section depends on the accuracy of the measurement of the stable section. The essence of transmission network stability section measurement is a collection of some measurement quantities. The factor that determines the accuracy of section measurement is not only the accuracy of the measurement device, but also the synchronization of many measurement quantities in the time dimension is one of the decisive factors. The statistical measurement device of the present invention measures the delay distri...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 李大路那广宇葛延峰刘凯张艳军赵鹏高凯冯松起王爱华曲祖义于鑫陈涵王珺曾辉李青春王印李铁张建李典阳卢崇毅
Owner DANDONG ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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