Method for measuring phasor frequency of electric system
A technology of frequency measurement and power system, applied in the direction of frequency measurement devices, etc., can solve the problem of unsatisfactory frequency accuracy and achieve the effect of improving frequency calculation accuracy and meeting engineering needs
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[0028] Assuming that the sampled value sequence after low-pass filtering by a finite-length impulse response digital low-pass filter is expressed as , Here the frequency f is set to 35.7Hz, h=0,1,2,... N takes 32, then for second. Frequency measurement upper limit manually set in advance And lower limit They are 75Hz and 35Hz respectively.
[0029] Unless otherwise specified, the calculation variable is of double type, the unit of phase is radians, the unit of frequency is Hz, and the decimals are truncated for rounding.
[0030] Suppose the current sampling time is ,then:
[0031] = -14.601629, = -133.395520,
[0032] = = 1.679831
[0033] The recorded sampling time is Time:
[0034] = 4.363731, = -134.115434,
[0035] = = 1.538271
[0036] The initial frequency value is:
[0037]
[0038] = 36.047874
[0039] The error between the initial frequency value and the actual frequency value is:
[0040] 36.047874 – 35.7 = 0.347874
[0041] Round off the initial frequency v...
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