Fault section location method in distribution network based on full frequency band of transient information
A distribution network fault and section location technology, applied in the direction of fault location, information technology support system, fault detection by conductor type, etc.
Active Publication Date: 2018-09-07
STATE GRID CORP OF CHINA +2
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[0008] The above-mentioned BP neural network is a prediction system, which brings convenience to the research, and does not need to provide an accurate correspondence mechanism between multiple zero-sequence current characteristic data and fault sections. However, the BP neural network requires a large number of samples for training , and the problem of inaccurate prediction is difficult to eradicate
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[0023] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0024] The present invention provides a distribution network fault section location method based on the full frequency band of transient information, such as figure 1 and figure 2 As shown, the method includes the following steps: the step S10 of collecting fault transient signals of each monitoring point of the distribution line; the step S20 of performing denoising and filtering on the fault transient signals to obtain a transient filter signal; Step S30 of judging the initial phase angle of the fault of the distribution line; if the initial phase angle of the fault is non-zero, use the adaptive harmonic wavelet packet transform to subdivide the full frequency band of the transient filter s...
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The present invention discloses a power distribution network faulty section positioning method based on a transient information full frequency band. The method comprises the following steps of acquiring the fault transient signals of the monitoring points of a distribution line; carrying out the denoising filtering on the fault transient signals to obtain the transient filtering signals; determining the fault initial phase angles of the transient filtering signals of the distribution line; if the fault initial phase angles are zero, utilizing an EMD method to decompose the transient filtering signals to obtain the DC components, and utilizing the DC components to position the fault sections; if the fault initial phase angles are not zero, utilizing the adaptive harmonic wavelet packet transform to carry out the full frequency band subdivision on the transient filtering signals to determine the characteristic frequency bands, and extracting the extreme values and the polarities of the wavelet transform coefficients in the characteristic frequency bands corresponding to the monitoring points to position the fault sections. The power distribution network faulty section positioning method of the present invention fully utilizes the transient full frequency band information at the fault moments, and determines the fault sections accurately aiming at different grounding fault initial phase angles.
Description
technical field [0001] The invention relates to a method for locating a distribution network fault section based on a full frequency band of transient state information. Background technique [0002] With the access of distributed energy sources and the development of smart distribution network construction, the existing distribution network fault location technology mainly adopts the line selection or direct protection trip through the protection device in the station or the small current line selection device, and then manually The search method is used to locate and troubleshoot the fault point. Since the distribution network is mainly close to the user side, when the fault point occurs in an area with complex terrain or the fault trace is not obvious, relying on manual line inspection will greatly prolong the power supply recovery time, and the efficiency is low. In line with the development trend of the future distribution network. [0003] At present, the application ...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 许明李配配徐振平夏赵静杜向楠郭宁明
Owner STATE GRID CORP OF CHINA