Grid frequency setting double-ellipse fitting method and application adopting same
A technology of frequency setting and double ellipse, which is applied in general control systems, instruments, electrical testing/monitoring, etc., can solve the problems of unsatisfactory detection effectiveness, interference, and inability to obtain estimates, achieving considerable economic benefits and improving The detection rate and the effect of increasing the degree of automation
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Embodiment 1
[0030] Such as figure 1 As shown, the basic steps of the grid frequency setting double ellipse fitting method include:
[0031] S1, assignment, initialization, setting the upper limit f of the upper cut-off frequency of the bandpass filter Hmax and lower bound f Hmin , the upper limit f of the lower cut-off frequency Lmax and lower bound f Lmin , and the upper cutoff frequency step Step_H and the lower cutoff frequency step Step_L, assign 0 to i and P max ; for example, the upper limit f of the upper cutoff frequency of the bandpass filter Hmax is 0.5, the lower limit f Hmin is 0.02; the upper limit f of the lower cut-off frequency Lmax Less than 0.02, lower limit f Lmin is 0.001; the step size of the upper cutoff frequency Step_H is 0.01~0.05, and the step size of the lower cutoff frequency Step_L is 0.001~0.002.
[0032] S2. Use the double loop method to search for the upper and lower cut-off frequencies, the lower cut-off frequency is the outer loop, and the up...
Embodiment 2
[0035]S1, assignment, initialization, setting the upper limit f of the upper cut-off frequency of the bandpass filter Hmax and lower bound f Hmin , the upper limit f of the lower cut-off frequency Lmax and lower bound f Lmin , and the upper cutoff frequency step Step_H and the lower cutoff frequency step Step_L, assign 0 to i and P max ; for example, the upper limit f of the upper cutoff frequency of the bandpass filter Hmax is 0.5, the lower limit f Hmin is 0.02; the upper limit f of the lower cut-off frequency Lmax Less than 0.02, lower limit f Lmin is 0.001; the step size of the upper cutoff frequency Step_H is 0.01~0.05, and the step size of the lower cutoff frequency Step_L is 0.001~0.002. S2. Search the upper cut-off frequency and the lower cut-off frequency, and calculate the percentage of the subset data segment points between the inner ellipse and the outer ellipse accounting for all the points of the entire subset data segment; the inner ellipse is reduced by ...
Embodiment 3
[0041] The difference between this embodiment and the previous implementation is in step S2:
[0042] S2.21. For a given lower cut-off frequency f L , the upper cut-off frequency f H Follow the upper cutoff frequency step Size Step_H from the upper limit f Hmax lower down or from the lower limit f Hmin Increasing upwards, for each set of given upper cutoff frequency and lower cutoff frequency, calculate the percentage of points in the subset data segment between the inner ellipse and the outer ellipse to all points in the entire subset data segment P new ;
[0043] S2.22, the upper limit f of the lower cut-off frequency Lmax and lower bound f Lmin Between, change the lower cut-off frequency f according to the lower cut-off frequency step Step_L L value, repeat step S2.21; obtain the percentage P new The maximum percentage in P max , record the upper and lower cutoff frequencies corresponding to this percentage.
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