Fault single end positioning method of power transmission line based on traveling wave multi-scale information
A technology for transmission lines and single-ended faults, applied in directions such as fault locations, can solve problems such as errors and reduced fault positioning accuracy, and achieve the effects of improving positioning accuracy, ensuring safe operation, and high positioning accuracy
Active Publication Date: 2012-06-27
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
The application of wavelet transform in the traveling wave fault location method can better determine the arrival time of the head of the traveling wave. When the actual transmission line is faulty, the frequency component of the second traveling wave head does not necessarily contain the highest frequency component of the first traveling wave head because the frequency components of the traveling wave head change during propagation, so only Determining the arrival time of the traveling wave head on a decomposition scale will bring a certain error, which will reduce the accuracy of fault location
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[0051] A specific embodiment of the present invention is a single-end location method for transmission line faults based on traveling wave multi-scale information, the steps of which are as follows:
[0052] A. Data collection and preprocessing
[0053] The fault recording device collects the fault current traveling wave signals of three phases A, B, and C from the transmission line at the sampling rate Fs A (t), i B (t), i C (t) is transmitted to the fault location device, where t represents the sampling time. After filtering, the fault location device selects the corresponding phase as the reference phase according to the fault type of the transmission line under test, and uses the Clarke matrix to carry out fault current traveling wave signals. Phase-to-mode transformation to obtain the transmission line fault current traveling wave mode signal x(t) for fault location;
[0054] B. Extraction of traveling wave wavelet modulus maximum
[0055] Multi-layer continuous wavel...
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The invention discloses a fault single end positioning method of a power transmission line based on traveling wave multi-scale information, which comprises the following steps of: selecting different phases as reference phases according to different fault types and carrying out phase-mode transformation on a fault current traveling wave signal of the power transmission line to obtain a fault current traveling wave mode signal for fault positioning; carrying out continuous wavelet transformation on the mode signal, extracting modulus maximums of wave heads of first and second traveling waves on each wavelet transformation coefficient and corresponding moments of the modulus maximums and judging a section where the fault occurs and determining frequency components of the wave heads of the first and the second traveling waves for positioning according to wavelet transformation modulus maximums to obtain mode wave speeds of the two traveling waves with different frequency components and arrival moments of the wave heads; and finally comprehensively calculating the fault distance of the power transmission line in combination with the mode wave speeds and the arrival moments of the two traveling waves. In the fault single end positioning method of the power transmission line, the frequency components, the mode wave speeds and the arrival moments of the wave heads of the traveling waves are accurately determined by utilizing the multi-scale information of the traveling waves so as to accurately calculating the fault distance of the power transmission line.
Description
technical field [0001] The invention relates to a single-end positioning method for transmission line faults in a power system. Background technique [0002] The traveling wave fault location method has the advantages of high positioning accuracy, high reliability, good stability, and little influence by fault resistance, so the traveling wave method is one of the mainstream fault location methods at present. Compared with the double-ended traveling wave fault location method, the single-ended traveling wave fault location method does not need communication channels and signal synchronization, which not only reduces the cost of the location system but also improves its reliability. [0003] At present, the main factors affecting the accuracy of the single-ended traveling wave fault location method are the propagation speed of the fault traveling wave and the arrival time of the traveling wave head. [0004] In the existing traveling wave fault location method, the propagati...
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IPC IPC(8): G01R31/08
Inventor 何正友林圣武骁廖凯李小鹏
Owner SOUTHWEST JIAOTONG UNIV
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