Method for analyzing electric network waveform distortions and automatically monitoring electric power harmonic parameters
A technology for automatic monitoring of power harmonics, applied in the direction of measuring electrical variables, measuring current/voltage, spectrum analysis/Fourier analysis, etc.
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[0029] In order to achieve the above object, the implementation of the present invention can 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 the signal sampling after appropriate signal conditioning Entrance.
[0030] Step a. Sampling the voltage or current of the power signal to be analyzed, and press figure 1 The process calculates its Chirp-Z Transform or CZT value , take a natural positive integer, and then calculate the fundamental wave parameters, amplitude, frequency and phase of the power signal by formula 1, formula 2 and formula 3;
[0031] Estimate the fundamental amplitude: Formula 1
[0032] Estimate the fundamental frequency value: f 1 =(θ+k’Ф) / 2 Formula 2
[0033] Estimate the fundamental phase value: Formula 3
[0034] In the above 3 formu...
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