Novel digital flickering instrument based on time-frequency domain decomposition
A time-frequency domain, digital technology, applied in the field of new digital flicker meter, can solve problems such as large flicker error and lack of auxiliary analysis
Inactive Publication Date: 2018-09-07
SHANXI UNIV
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[0005] The present invention is a novel digital flicker instrument based on time-frequency domain decomposition, which overcomes the inability of the existing digital flicker instrument to carry out relevant auxiliary analysis due to the lack of time-frequency domain information of each voltage fluctuation, and the traditional time-frequency domain decomposition The method evaluates the large flicker error, and provides a digital flicker instrument that can not only meet the accuracy requirements of the national standard 12326, but also perform auxiliary analysis based on the time-frequency domain information of each voltage fluctuation
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[0022] like figure 1 As shown, a new type of digital flicker instrument based on time-frequency domain decomposition, including signal input module 1, square demodulation module 2, band-pass filter module 3, analytical mode decomposition unit 4, visual sensitivity weighting unit 5, Time-frequency domain auxiliary analysis unit 6, summation unit 7, square and first-order low-pass digital filter 8, statistical evaluation module 9 and output terminal 10, signal input module 1, square demodulation module 2, band-pass filter module 3 , the analytical mode decomposition unit 4 is connected in sequence, the analytical mode decomposition unit 4 is connected with the visual sensitivity weighting unit 5 and the time-frequency domain auxiliary analysis unit 6 respectively, the visual sensitivity weighting unit 5, the summing unit 7, the square and the first-order low A digital filter 8, a statistical evaluation module 9 and an output terminal 10 are sequentially connected.
[0023] The ...
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The invention provides a novel digital flickering instrument based on time-frequency domain decomposition and belongs to the technical field of wind power generation detection. For solving the technical problem, a digital flickering instrument meeting the national standard 12326 requirements and performing auxiliary analysis according to time-frequency domain information of voltage fluctuations. According to the technical scheme, the novel digital flickering instrument comprises a signal input module, a square demodulation module, a band-pass filter module, an analysis mode decomposition unit,a visibility weighting unit, a time-frequency domain assisted analysis unit, a summation unit, a square and first-order low-pass digital filter, a statistic assessment module and an output end, wherein the signal input module, the square demodulation module, the band-pass filter module and the analysis mode decomposition unit are sequentially connected, the analysis mode decomposition unit is connected with the visibility weighting unit and the time-frequency domain assisted analysis unit respectively, and the visibility weighting unit, the summation unit, the square and first-order low-passdigital filter, the statistic assessment module and the output end are sequentially connected. The novel digital flickering instrument can be widely applied to the field of wind power generation detection.
Description
technical field [0001] The invention discloses a novel digital flicker instrument based on time-frequency domain decomposition, which belongs to the technical field of wind power generation detection. Background technique [0002] As one of the limiting factors for wind turbine grid connection, flicker needs to be accurately evaluated, and it can be detected according to the method recommended by the national standard "GB12326-2000 Power Quality Voltage Fluctuation and Flicker" (hereinafter referred to as GB 12326). However, in this method, except for the statistical evaluation link, all analog designs are used. In the actual analog circuit, it is more complicated to design the overvoltage and overcurrent protection of the filter, so it is necessary to design a digital flicker meter as a substitute To meet the national standard 12326. . [0003] Various digital flicker meters in full time domain, full frequency domain and mixed time-frequency domain have been proposed, but...
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IPC IPC(8): G01R23/167G01R19/25
CPCG01R19/25G01R23/167
Inventor 武晓冬朱燕芳赵巧娥刘芳
Owner SHANXI UNIV