Method for accurately calculating power harmonic wave parameters through adopting time delay Fourier transform frequency measurement method
A technology of Fourier transform and power harmonics, applied in spectrum analysis/Fourier analysis, etc., can solve the problems of not guaranteeing completely synchronous sampling, spectrum leakage, and increased calculation amount.
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[0043] Embodiment 1: directly use a voltage divider or obtain the busbar voltage signal of the power grid from the secondary side of the voltage transformer PT, obtain the current signal from the current transformer CT, and send it to the signal sampling inlet after proper signal conditioning.
[0044]Specific steps are as follows:
[0045] Step a. Take the sampling period as T s Sampling the analyzed power signal, that is, the voltage or current signal: x(n), according to the measurement accuracy requirements, select the appropriate symmetrical window function w(n)n∈[0, N-1] to truncate the sampled power signal: x w (n)=x(n)w(n)n∈[0, N-1], N is the data truncation length of the window function, and the truncated signal x w (n) carry out Fast Fourier Transform (abbreviation: FFT):
[0046] k ∈ [0, N-1].
[0047] The symmetric window function is: Hanning, Hamming, Black, Leif or Nuttall;
[0048] Multi-frequency power (voltage or current) harmonic signals can be expresse...
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