Fault arc detection method and system

Abstract

The invention provides a fault arc detection method and system, and relates to the field of arc detection. The fault arc detection method is used for detecting whether a fault arc exists in a to-be-detected line. The fault arc detection method comprises the steps of: monitoring a target component of the current in the line to be measured, specifically defining a plurality of time periods, and sampling the target component for multiple times in each time period to obtain a group of sampling data, so that the plurality of time periods respectively correspond to the plurality of groups of sampling data; subjecting a group of sampling data in each time period to fast Fourier transform to obtain spectrum data of each time period; performing similarity calculation on two groups of spectrum data corresponding to any two adjacent time periods to obtain a similarity value, and calculating a plurality of similarity values according to the plurality of groups of spectrum data corresponding to the plurality of time periods; and if one or more similarity values in the plurality of similarity values are not in the preset threshold range, judging that the fault arc exists in the to-be-detected line.

Description

technical field [0001] The present invention mainly relates to the field of arc detection, more precisely, relates to an arc monitoring system and an arc monitoring method for detecting DC arc phenomena applied in a photovoltaic power generation system. Background technique [0002] With the shortage of traditional energy sources and the development of power technology, photovoltaics have received more and more attention. The use of photovoltaic energy in electric power must meet safety regulations. Arc is a gas discharge phenomenon, and the spark generated by the current flowing through an insulating medium such as air is the manifestation of gas discharge. Detecting arcs and taking proactive countermeasures are key elements in keeping photovoltaic energy systems within safety regulations. Although the industry is trying its best to find the rules and commonality of the arc phenomenon in order to find the accurate detection method of the arc, the unavoidable fact is that i...

AI Technical Summary

Problems solved by technology

[0006] All in all, because the spectral characteristics of the arc are varied, it is a very difficult task to judge whether there is a real fault arc purely from the spectral characteristics: the main reason is that there is currently no unified conclusion on the standard of the fault arc parameter characteristics as the comparison target , it is of little significance to formulate standard arc parameter characteristics; moreover, the actual detected current parameter information will inevitably have more or less natural errors, which are the reasons why the arc cannot be detected or the arc is falsely reported

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