Fundamental wave and harmonic wave detecting method based on three-coefficient Nuttall windowed interpolation FFT
A harmonic detection and coefficient technology, applied in complex mathematical operations, spectral analysis/Fourier analysis, etc., can solve problems such as the inability to directly calculate the interpolation coefficient, the inability to calculate the interpolation coefficient, the absence of an effective solution to the equation, etc. Stability, small amount of calculation, the effect of reducing the amount of calculation
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[0040] Example 1
[0041] Taking the current harmonic detection of an electrical appliance as an example, the current expression of the electrical appliance is The set value is shown in Table 1. The fundamental wave and harmonics detection method based on Nuttall window interpolation FFT of the present invention is applied to measure the fundamental wave and the 2-9th harmonic (but the present invention is not limited to the 2-9th harmonic). In this embodiment, Matlab simulation software to illustrate its implementation process.
[0042] (1) Obtain the sampling data of the electrical current through the analog-to-digital converter, where the analog-to-digital converter uses MAX125CEAX integrated circuit chip, the sampling frequency f s = 10kHz, data length N = 2048. Matlab software adds 80dB Gaussian white noise to the original signal to represent its measurement noise.
[0043] (2) Construct a 2048-point three-term coefficient Nuttall window, add a window to the sampled data, and...
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