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Method, device, apparatus and medium for power grid harmonic testing and analysis

An analysis method and wave recording device technology, applied in the field of power grid harmonic general survey and analysis, can solve problems such as the quality of test data that consumes a lot of resources, the difficulty of harmonic source control, and the search for transmission direction, so as to improve the quality and results of general survey data Accuracy, good economic benefits, and the effect of improving work efficiency

Inactive Publication Date: 2018-12-28
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

A power quality analyzer can only test one monitoring point in the substation at a time and the test time is more than 24 hours, which often consumes a lot of resources and the quality of test data is difficult to guarantee
Moreover, the existing general measurement method can only obtain the content of each harmonic voltage and current, but cannot analyze the transmission direction of the harmonic to find its source, which brings difficulties to the control of the harmonic source

Method used

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  • Method, device, apparatus and medium for power grid harmonic testing and analysis
  • Method, device, apparatus and medium for power grid harmonic testing and analysis
  • Method, device, apparatus and medium for power grid harmonic testing and analysis

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Embodiment 1

[0044] see figure 1 , a schematic flow chart of the power grid harmonic general measurement and analysis method provided by the first embodiment of the present invention;

[0045] S11. Obtain the wave recording data file of the wave recording device at the test point according to the preset wave recording device parameters; wherein, the wave recording data file includes the channel data of the three-phase AC voltage and the three-phase AC current at the test point;

[0046] Preferably, the wave recording data file of the wave recording device for obtaining test points according to the preset wave recording device parameters includes:

[0047] Obtain the wave recording data file of the wave recording device at the test point according to the sampling rate of the preset wave recording device parameters not lower than 5KHz, and perform wave recording synchronization on the wave recording data file.

[0048]It should be noted that, in the prior art, when the harmonics are general...

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Abstract

The invention discloses a power grid harmonic testing and analysis method comprising the steps of: obtaining a wave recording data file of a wave recording device of a testing point according to preset wave recording device parameters, wherein the wave recording data file comprises channel data of three-phase alternating current voltage and three-phase alternating current of the testing point; selecting sampling data of ten-cycle wave length as an analysis unit according to a predetermined channel and performing a fast Fourier transformation on the sampling data to obtain fundamental wave, each sub-harmonic effective value and each sub-harmonic phase of the predetermined channel; obtaining each sub-harmonic voltage distortion rate, total harmonic distortion rate and each sub-harmonic current effective value according to the fundamental wave and each sub-harmonic effective value, so as to obtain a harmonic content level of the testing point; obtaining corresponding phase difference by each sub-harmonic current phase in each sub-harmonic phase minus each sub-harmonic voltage phase; and obtaining the transmission direction of the corresponding harmonic according to the phase difference and the corresponding harmonic effective power. According to the method, device, apparatus and medium for power grid harmonic testing and analysis, the power grid harmonic testing efficiency can beimproved, the harmonic source searching can be completed and the measurement data quality and the result accuracy are improved.

Description

technical field [0001] The invention relates to the technical field of power grid harmonic general measurement, in particular to a power grid harmonic general measurement analysis method, device, equipment and medium. Background technique [0002] The development of industry and economy has made the trend of power electronics on the power generation side, high-voltage direct current transmission and user side of the power system more and more significant, and the problem of harmonic pollution in the power system has become increasingly serious. Quality made a huge difference. To control the harmonics in the power grid system, the primary problem to be solved is the general measurement of the harmonics in the power grid and the search for the source of the harmonics. [0003] At present, power grid companies usually use portable power quality analyzers to carry out harmonic testing in each substation or converter station of the entire network. A power quality analyzer can o...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R23/165G01R1/02
CPCG01R1/02G01R23/16G01R23/165
Inventor 刘桓瑞
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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