Method and apparatus for measuring interhamonics of power grid
A power grid and harmonic technology, applied in the field of power system inter-harmonic measurement instrument and inter-harmonic measurement, can solve the problem of difficult and accurate measurement of inter-harmonic, reduce harmonic measurement errors, reduce synchronization errors, and save computing time Effect
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[0038] The technical scheme of the invention will be described in detail below in conjunction with the drawings:
[0039] Such as figure 1 As shown, the interharmonic measuring instrument of the present invention includes two special units:
[0040] (1) Approximate synchronization unit: the grid frequency tracking is realized by the phase-locked loop circuit (PLL), and the zero-crossing detector cooperates with the DSP to accurately measure the frequency: with a constant sampling frequency f S The grid voltage (current) waveform is sampled, and the PLL circuit tracks the grid frequency, and the output of the PLL circuit is used as the sampling clock of the ADC, so that the sampling is as close to synchronous sampling as possible.
[0041] (2) HHT-FFT calculation unit: Use HHT to extract the envelope of the signal, perform FFT analysis on the envelope signal, and then calculate the harmonic and interharmonic information of the power grid.
[0042] Such as figure 2 As shown, the approx...
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