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Method of measuring electrical power system signal frequency and harmonic wave parameters

A power system and signal frequency technology, which is applied in the field of measuring power system signal frequency and harmonic parameters, can solve problems such as long calculation time, high number of iterative formulas, and large signal analysis errors

Inactive Publication Date: 2013-07-10
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

[0004] However, due to the dynamics and complexity of the harmonic signal, the existing technology has relatively large errors in the analysis of the frequency, amplitude and phase of the signal. Due to the high number of iteration formulas and the large number of items, the calculation time is relatively long
Therefore, fast and high-precision frequency measurement and harmonic analysis are difficult to achieve

Method used

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  • Method of measuring electrical power system signal frequency and harmonic wave parameters
  • Method of measuring electrical power system signal frequency and harmonic wave parameters
  • Method of measuring electrical power system signal frequency and harmonic wave parameters

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Embodiment Construction

[0035] The schematic diagram of the present invention is shown in figure 2 (M is the maximum harmonic order analyzed), where the waveform of the actual signal is shown in image 3 , the windowed waveform is shown in Figure 4 , the spectrogram after the estimation algorithm is shown in Figure 5 , harmonic amplitude and phase error analysis form shown in Table 1.

[0036] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but they are not intended to limit the present invention.

[0037] The present invention can be used as a digital substation to perform harmonic measurement in a system that samples power signals according to the IEC61850-9-2 standard frame digital sampling rate. At present, the sampling rate of most digital substations is 10kHz, and a voltage harmonic signal is selected. x(t), such as image 3 shown.

[0038] The harmonic detection method of asynchronous sampling of the present...

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Abstract

The invention relates to a method of measuring electrical power system signal frequency and harmonic wave parameters. Modification is conducted on two maximal spectral lines close to a real frequency point in FFT data, comprising six items of Rife-Vincent (I) windows, of sampling data, therefore frequencies, amplitudes and phases of harmonic waves are obtained, and the six items of Rife-Vincent (I) windows W (n) satisfy the equations that b0=1; b1=5 / 3; b2=20 / 21; b3=5 / 14; b4=10 / 126; and b5=1 / 126. The method is simple to achieve, and can achieve high accuracy in actual application, and calculating quantity is smaller than that of common cosine windows.

Description

technical field [0001] The present invention relates to a method for measuring frequency and harmonic parameters of power system signals, in particular to a method for measuring power system signals based on bispectral interpolation FFT (fast Fourier transform) of 6-item Rife-Vincent (I) window Methods for frequency and harmonic parameters. Background technique [0002] When the signal frequency changes, serious spectrum leakage and fence effects will occur when using conventional harmonic software algorithms. Spectrum leakage and fence phenomenon cause large errors in the amplitude, phase angle and frequency of the detected harmonics, which cannot meet the requirements of detection accuracy. The interpolation algorithm can solve the fence problem, but it cannot eliminate the measurement error caused by the spectral leakage phenomenon; the algorithm of DFT analysis after windowing can reduce the spectral leakage error, but it needs to balance the complexity of the window fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02G01R23/16
Inventor 王玲徐柏榆盛超李玎赵艳军刘开培乐健张俊敏汪立
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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