Feature extracting method for power load dynamic features
A technology of electric load and feature extraction, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of parameter identification errors, model structure errors, and the inability to reflect the essential characteristics of load dynamic characteristics, etc.
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[0044] The present invention is described in detail below in conjunction with accompanying drawing:
[0045] Such as figure 1 As shown, execute step 01 to start;
[0046] Next, perform step 02 to preprocess the three-phase transient current data reflecting the dynamic characteristics of the load, and select the sampling data of one cycle before the fault and two cycles after the fault as samples, denoted as X i =[X i1 (n);X i2 (n);X i3 (n)], where i is the sample number, n is the number of sampling points in three cycles, X i1 (n), X i2 (n), X i3 (n) are the sampling signals of the three-phase current respectively.
[0047] Then, execute step 03, select a wavelet base, and determine the lifting format of the selected wavelet base. The smoother the wavelet is, the more obvious the computational load of the lifting algorithm is reduced. Compared with other db wavelets, db4 wavelet has better performance in spectrum leakage and resolution, so db4 wavelet is selected. Th...
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