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Harmonic measurement channel calibration method based on MIR-RSD high-precision cosine window interpolation FFT algorithm

A technology for measuring channels and calibration methods, applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as reducing work efficiency, failing to prevent harmonics, and affecting measurement accuracy

Inactive Publication Date: 2015-08-12
HUNAN UNIV
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Problems solved by technology

However, the error generated in the harmonic measurement directly affects the measurement accuracy, which cannot achieve the expected effect of preventing harmonics and reduces work efficiency.

Method used

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  • Harmonic measurement channel calibration method based on MIR-RSD high-precision cosine window interpolation FFT algorithm
  • Harmonic measurement channel calibration method based on MIR-RSD high-precision cosine window interpolation FFT algorithm
  • Harmonic measurement channel calibration method based on MIR-RSD high-precision cosine window interpolation FFT algorithm

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Embodiment Construction

[0036] The invention proposes a method for calibrating a harmonic measurement channel based on an MIR-RSD high-precision cosine window interpolation FFT algorithm. Describe in detail below in conjunction with accompanying drawing:

[0037] The functional block diagram of the processing flow of this embodiment is as follows figure 1 As shown, the signal is converted into a digital quantity after passing through a data acquisition module including step-down, filtering, and analog-to-digital conversion, and then sent to the harmonic parameter detection module equipped with a DSP chip, where the converted data will be added Window interpolation FFT operation to obtain the accurately calculated true value L1, read the harmonic measurement result L2 of the calibrated harmonic measurement channel, and use the harmonic measurement result L1 of the harmonic parameter detection module as the true value to perform the system M times of measurement, to obtain M groups of data about L1 an...

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Abstract

The invention discloses a harmonic measurement channel calibration method based on an MIR-RSD high-precision cosine window interpolation FFT algorithm, which comprises a data acquisition module, a harmonic parameter detection module used for carrying out windowing interpolation FFT algorithm on data and a calibration module used for harmonic measurement channel parameter adjustment, wherein the harmonic parameter detection module adopts the MIR-RSD high-precision cosine window based interpolation FFT algorithm, time-domain signals are subjected to MIR-RSD windowing and discrete Fourier transform so as to acquire a discrete spectrum Xw(k), a spectrum line k1 with the amplitude being the maximum near the frequency fN in the discrete spectrum, a spectrum line k2 at the left of the spectrum line k1 and a spectrum line k3 at the right of the spectrum line k1, the corresponding frequency spectrum amplitudes are abs(X(k1)), abs(X(k2)) and abs(X(k3)) respectively, a weighting ratio coefficient beta is calculated, then a non-integer portion frequency component delta is solved, the amplitude, the frequency and the phase angle are obtained according to a value of the delta to act as standard values, and the calibration is carried out on the harmonic measurement channel to be calibrated.

Description

technical field [0001] The invention relates to the field of signal phasor measurement, in particular to a harmonic measurement channel calibration method based on MIR-RSD high-precision cosine window interpolation FFT algorithm. Background technique [0002] As we all know, the measurement and analysis of power system harmonics has become an important research direction in the field of power systems. In recent decades, with the wide application of various power electronic devices (mainly some nonlinear devices), the harmonic pollution of the power grid has become increasingly serious and the power quality has declined. Therefore, real-time measurement and analysis of power grid harmonic components is very necessary to prevent harmonic harm and improve power quality. However, the errors generated in the harmonic measurement directly affect the measurement accuracy, and the expected effect of preventing harmonics cannot be achieved, which reduces the work efficiency. Theref...

Claims

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Application Information

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IPC IPC(8): G01R35/00
Inventor 温和陈洲黎福海滕召胜郭斯羽胡亮张军号张政
Owner HUNAN UNIV
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