Power signal synchronized phasor measurement method based on frequency domain dynamic model
A synchrophasor measurement and power signal technology, applied in spectrum analysis/Fourier analysis, etc., can solve the problems of increasing DFT algorithm error, unavailability, and reducing the dynamic security monitoring capability of power grid, and achieve the effect of accurate synchronous measurement
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[0028] A kind of embodiment of the present invention is, the power signal synchrophasor measurement method based on frequency domain dynamic model, its steps are:
[0029] A. Data collection and pre-estimation processing
[0030] The voltage transformer or current transformer in the power grid measures the voltage or current signal of the power grid, and collects the voltage or current signal to obtain the discrete sequence x(n) of the power signal of the power grid, where n is the sampling time; the digital signal processor processes the discrete sequence of the power signal Perform windowed Fourier transform on x(n) to obtain 2L+1 phasor measurement pre-estimated values X(ω) offset by 50Hz fundamental wave ω radians, where ω=l·Δω, l=0, ±1, ±2, ..., ±L, Δω is the radian difference of the pre-estimated values of adjacent phasors;
[0031] B. Correction of phasor pre-estimated value
[0032] The digital signal processor performs synchronized phasor measurement on the obta...
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