An Adaptive Weighted Grounding Line Selection Method Based on Wavelet Singular Information
A technology of self-adaptive weight and grounding line selection, applied in short-circuit test, fault detection according to conductor type, instrument, etc., can solve the problems of poor stability and difficult selection, and achieve the effect of improving similarity and reducing negative impact
Active Publication Date: 2021-05-28
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0005] In order to overcome the drawbacks of the existing ground fault line selection methods, which are severely restricted by factors such as transition resistance and fault phase angle, and poor in stability under different fault conditions, on the other hand, it is difficult to select a suitable line under different operating conditions and fault conditions. The disadvantages of weight, the present invention provides an adaptive weight grounding line selection method based on wavelet singular information, which uses adaptive weight coefficients to realize fault information fusion based on comprehensive wavelet singular distance, improving the accuracy and reliability of fault line selection Spend
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Embodiment 1
[0073] Such as figure 1 The flow chart of the adaptive weighted grounding line selection method based on wavelet singular information is shown, and the steps are as follows:
[0074] S1. Record the zero-sequence current sequence of each outgoing line from one current cycle before the fault to the two current cycles after the fault through the fault recorder, and the zero-sequence current sequence is expressed as I 0i , i=1,2,3...,q,q represent the total number of outgoing lines;
[0075] In the zero-sequence current sequence between the first current cycle before the fault and the two current cycles after the fault, for each outgoing line, the number of recorded zero-sequence currents is:
[0076]
[0077] Among them, N represents the number of zero-sequence current recorded in each outgoing line in the zero-sequence current sequence; T represents the time length of a current cycle; f s Indicates the recording frequency of the zero-sequence current.
[0078] S2. Normaliz...
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The invention discloses an adaptive weighted grounding line selection method based on wavelet singular information, which includes the following steps: S1. Record the zero current cycle between the current cycle of each outgoing line before the fault and the two current cycles after the fault through a fault recorder. Sequence current sequence; S2, normalize the zero-sequence current sequence; S3, calculate the wavelet singular information vector corresponding to the normalized zero-sequence current sequence; S4, calculate the wavelet singularity of each outgoing line corresponding to different scales value, and combined with the wavelet singular information vector to construct an adaptive weight comprehensive measurement evaluation function; S5, calculate the adaptive weight comprehensive measurement evaluation function value corresponding to each outgoing line through the adaptive weight comprehensive measurement evaluation function, and select the single-phase ground fault line. The invention can adapt to different fault working conditions, has strong resistance to transition resistance, fault phase angle, fault distance and other factors, and the line selection is accurate and reliable.
Description
technical field [0001] The invention relates to the technical field of power system grounding fault detection, and more specifically, to an adaptive weighted grounding line selection method based on wavelet singular information. Background technique [0002] The neutral point grounding methods commonly used in my country's 10iV distribution network include neutral point non-grounding, neutral point grounding through high resistance and neutral point grounding through arc suppression coils. Mainly, single-phase ground faults account for the vast majority of the fault types that occur on lines under this grounding method. When a single-phase ground fault occurs in a system whose neutral point is grounded via an arc-suppression coil, the fault current of the system is very small due to the arc-suppression coil compensating the capacitive current of the ground fault. 1 to 2 hours, but during this period, the faulty line must be quickly selected and removed to avoid further expan...
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IPC IPC(8): G01R31/52G01R31/08
CPCG01R31/086G01R31/088
Inventor 黄建明莫颖生李强刘玲陈文娟
Owner GUANGDONG POWER GRID CO LTD