Method and device for locating fault point of distribution network line based on singular value decomposition

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, ...

AI Technical Summary

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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