A method to improve the measurement accuracy of power grid stability section by improving data synchronization
A technology of measurement accuracy and data synchronization, applied in the measurement of electricity, measurement devices, and measurement of electricity variables, etc., can solve problems such as errors in the measurement of transmission network cross-sections and inaccurate analysis data for power grid security and stability, so as to alleviate transmission congestion and improve power grids. Utilization, the effect of improving accuracy
Active Publication Date: 2022-03-15
DANDONG ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +2
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[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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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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The method for improving the measurement accuracy of the stable section of the power grid by improving the data synchronization is characterized in that it comprises the following steps: 1) obtaining the measured value of a period of time sequence of the nodes of the stable section, and the measured value includes voltage amplitude, current amplitude and power value; 2) Obtain the measured values of the PMUs that are close to the nodes of the stable section for a period of time, the measured values include voltage amplitude, current amplitude and power value; 3) Calculate the common measurement z s and PMU measure z w Correlation coefficient matrix ρ sw ; 4) According to the correlation coefficient matrix ρ sw , to solve the reference measurement time t of the measurement set; 5) According to the reference measurement time t, a more accurate measurement value of the stable section of the transmission network can be obtained. The beneficial effect of the present invention is: the present invention reduces the error of transmission network cross-section measurement by synchronizing the measurement data, provides relatively accurate data for power grid security and stability analysis, further reduces the margin reserved for power grid stability control measures, and improves 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...
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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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