Fault circuit selection method based on EMD and rough set theory
A fault line selection and theoretical technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of information redundancy, weak fault information, misjudgment of fault lines, etc., to achieve less redundancy, data The effect of strong digging ability
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[0019] A fault line selection method based on EMD and rough set theory, specifically comprising the following steps:
[0020] Step 1: Use the cubic spline function to fit the upper and lower envelopes of the original signal, and constantly remove the average value of the maximum and minimum values of the original signal, and the original signal can be broken down into:
[0021]
[0022] In the formula, Indicates the component of the i-th IMF component at time t.
[0023] Step 2: Calculate the amplitude of the IMF component of the first layer of each line ;
[0024] in , Indicates the component of the first IMF component of the kth line at time t.
[0025] Step 3: Calculate the comprehensive correlation coefficient of the IMF component of the first layer of each line.
[0026] According to the principle of correlation analysis, the zero-sequence current signals of any two lines and The matching degree of correlation analysis is
[0027]
[0028] Then, f...
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