Multi-channel direct current arc detection method, circuit and electronic equipment thereof

Abstract

The embodiment of the invention discloses a multi-channel direct current arc detection method and circuit and electronic equipment thereof. The method comprises the steps of performing current sampling on a to-be-detected current to obtain frame data; performing time domain analysis on the frame data, and judging whether the frame data has a time domain fault or not; obtaining frequency domain data; performing frequency domain analysis on the frequency domain data, and judging whether the frequency domain data has a frequency domain fault or not; in the time domain and frequency domain analysis period, an arc event is calculated; the arc event is compared with an arc event threshold to determine whether an arc exists. By means of the mode, real-time time domain analysis can be carried out on the collected data, frequency domain analysis is carried out on the data for judging time domain faults, the arc detection time of a single channel can be greatly shortened, the calculated amount of the single channel can be greatly reduced, and therefore multi-channel parallel detection is achieved. By calculating the sum of the time domain arc event and the frequency domain arc event in a fixed period, the occurrence of the arc event is judged, and by adopting the method, the accuracy of arc detection can be improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of power protection, in particular to a multi-channel DC arc detection method, circuit and electronic equipment thereof. Background technique [0002] The popularity of distributed photovoltaic power generation has put forward higher and higher requirements for the safety of photovoltaic power plants. There are many electrical connection points in the photovoltaic power generation system. When the high-voltage DC line or connector in the photovoltaic power generation system fails, it may Lead to the generation of DC arc, the existence of DC arc will cause leakage or fire in the equipment or lines in the electrical system, cause damage to electrical equipment, and even endanger the safety of human life and property. Therefore, there is an urgent need for a protective device to detect the DC arc, and before the DC arc ignites the combustibles, the circuit is disconnected, the DC arc i...

AI Technical Summary

Problems solved by technology

[0005] 1. The arc detection scheme disclosed in CN106199131A is to add 1 to the number of counts when there is an arc fault in both the time domain and the frequency domain, otherwise the number of counts is reduced by 1; for intermittent or small arcs, the technical solution disclosed by CN106199131A cannot detect out, that is, there is a problem of missed detection, and intermittent arcs or small arcs that have not been detected may cause equipment failures, which may cause fires, thereby causing safety problems;

[0006] 2. The arc detection scheme disclosed in CN106199131A is mainly implemented by hardware. After a fault occurs in the time domain, the data is directly sent to the second circuit for frequency domain analysis and processing. It can only do single-channel arc detection and cannot realize multi-channel arc detection.

Images