Method for extracting time-frequency parameters of power quality disturbance signals on basis of fast K-S (Kaiser-S) transformation
A power quality disturbance, time-frequency parameter technology, applied in the measurement of electrical variables, measurement of electricity, measurement devices, etc., can solve the problems of high time-frequency energy accumulation, large time-frequency complex matrix information, and complex operations.
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[0090] The present embodiment comprises the following steps:
[0091] In step S201, the measured signal is sampled, and the power quality disturbance signal is input into the power system analyzer for sampling to obtain the measured signal x(n);
[0092] In step S202, fast K-S (Caesar-S) transformation: perform K-S transformation on the measured signal sampled in step (1) to obtain the characteristic frequency f m The corresponding disturbance signal K-S transform spectrum, the characteristic frequency is analyzed as f m The amplitude, phase, start and stop, and sudden change time of the corresponding disturbance signal;
[0093] (3) Repeat step (2) until all the characteristic frequencies f are calculated m The K-S transformation spectrum of the corresponding disturbance signal is completed, and the K-S transformation KS(τ,f) of the disturbance signal is completed, and the amplitude, phase, start and end, and sudden change time of all disturbance signals are analyzed;
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