Distribution network fault point positioning method based on singular value decomposition and device thereof

A singular value decomposition and line fault technology, which is applied to the fault location, measurement device, and fault detection according to the conductor type, can solve the problems of high sampling rate, small fault traveling wave amplitude, and large attenuation distortion. Small sampling time window, increased trigger speed, large attenuation and distortion effects

Active Publication Date: 2019-02-26
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

However, the complex line structure and numerous branches of the distribution network lead to small fault traveling wave amplitude and large attenuation distortion, which makes it difficult to locate distribution network faults.
However, the current fault traveling wave detection device usually uses the traveling wave amplitude as the fault criterion, which leads to misjudgment and missed judgment of the fault, and it is difficult to obtain a better fault traveling wave recording waveform; The sampling rate of the equipment is high, and the hardware performance of the equipment is high, and it is not widely used in the case of low-cost control of the distribution network

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  • Distribution network fault point positioning method based on singular value decomposition and device thereof
  • Distribution network fault point positioning method based on singular value decomposition and device thereof
  • Distribution network fault point positioning method based on singular value decomposition and device thereof

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[0065] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

[0066] When a fault occurs on a power line, a transient traveling wave process will appear on the line due to a sudden change in voltage at the fault point. The traveling wave phenomenon on the power line can be described by the telegraph equation based on the distributed parameter line model. Both the voltage and current along the line contain two traveling wave components, forward and rev...

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Abstract

The invention discloses a double-sampling-rate distribution network line fault point accurate positioning method based on singular value decomposition and a device thereof. The method comprises the steps of performing phase correlation calculation on a phase current waveform which is acquired by low-sampling-rate measuring equipment, starting a wave recording function of high-sampling-rate measuring equipment when occurrence of a fault is determined, then processing the phase current waveform which is acquired by the high-sampling-rate measuring equipment, and performing accurate positioning on the fault point according to a D-type traveling wave method. According to the method and the device, through performing correlation coefficient calculation on the waveform data, a problem of low reliability in traditional amplitude triggered wave recording is settled. Furthermore correlation calculation is only performed on the low-sampling-rate data, thereby effectively reducing calculation amount and increasing fault wave recording triggering speed. Furthermore the utilized high-sampling-rate measuring equipment has a small sampling time window and does not depend on a high storage capacity, thereby effectively reducing cost of distribution network testing equipment.

Description

technical field [0001] The invention relates to a method for diagnosing faults of distribution network lines, and more specifically, to a method for locating fault points of distribution network lines with double sampling rates based on singular value decomposition. Background technique [0002] With the continuous development of the economy, users have increasingly higher requirements on the quality of power supply. As the part of the power grid that directly interacts with users, the distribution network has a major impact on the user's power consumption experience, and the fault location of the distribution network is particularly important. At present, the domestic distribution network mostly adopts the neutral point non-effective grounding method, the topology structure is complex, and there are many branches; the ground fault current is small, and the fault location is difficult. With the improvement of people's requirements for distribution network automation level, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 房牧王峰刘明林苏建军刘合金樊迪李立生邵志敏张世栋张林利左新斌孙勇辜超李建修
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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