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Active photovoltaic string direct-current arc fault detection and fault positioning system and method

A DC arc and fault detection technology, which is applied in the monitoring of photovoltaic systems, photovoltaic power generation, fault location, etc., can solve problems such as complex calculation values ​​and susceptibility to external environment interference, and achieve strong anti-interference, convenient communication integration, and reduced The effect of false positive rate

Pending Publication Date: 2020-11-24
SHANGHAI JIAO TONG UNIV +1
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  • Description
  • Claims
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Problems solved by technology

These inventions are all based on the original voltage and current conditions on the DC bus of the photovoltaic system to judge whether an arc fault has occurred on the line. The threshold comparison method is used, which is susceptible to external environmental interference and requires a large number of complex calculations. There is a certain amount of DC current. Insufficient arc fault false detection rate

Method used

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  • Active photovoltaic string direct-current arc fault detection and fault positioning system and method
  • Active photovoltaic string direct-current arc fault detection and fault positioning system and method
  • Active photovoltaic string direct-current arc fault detection and fault positioning system and method

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Embodiment

[0041] Such as figure 1As shown, an active photovoltaic string DC arc fault detection and fault location system provided by the present invention includes a high-frequency signal generator and injector, a line signal measuring instrument, and an arc fault analysis module. The high-frequency signal generation and injector is used to generate high-frequency signals with certain characteristics, and inject the signal into the bus bar of the DC side of the photovoltaic string, so that it can be superimposed with the DC and other noise signals of the DC side of the photovoltaic string, and at the same time inject the The high-frequency signal characteristics are fed back to the fault arc analysis module. The line signal measuring instrument collects the output response signal of the previously injected high-frequency signal through the high-frequency current transformer, that is, the superimposed comprehensive signal of the aforementioned multiple signals, and filters out the DC an...

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Abstract

The invention provides an active photovoltaic string direct-current arc fault detection and fault positioning system and method. The system comprises a high-frequency signal generation and injection device, a line signal measuring instrument and an arc fault analysis module. According to the invention, the arc fault position is accurately positioned; fault troubleshooting and rapid operation recovery of a photovoltaic power station are facilitated, the influence of an inverter, field cable wiring and an operation environment on arc fault detection and fault positioning precision is reduced, and the defects that a method for detecting voltage and current characteristics in a conventional passive detection mode is prone to external interference, the arc fault detection precision is low and the misjudgment rate is high are overcome.

Description

technical field [0001] The invention relates to the technical field of photovoltaic system arc detection, in particular to an active photovoltaic string DC arc fault detection and fault location system and method. Background technique [0002] In recent years, my country's photovoltaic industry has developed rapidly. By the end of 2019, the cumulative grid-connected installed capacity of photovoltaic power generation across the country had reached 204GW. Among them, distributed photovoltaic was 62.6GW, a year-on-year increase of 24.2%, and the growth was particularly rapid. However, the photovoltaic system is prone to electrical fires due to DC arc faults caused by aging lines, loose connecting lines, and water corrosion. Photovoltaic DC arc can create stable combustion conditions under the joint influence of current limiting characteristics and independent characteristics of light current. If it is not diagnosed and cut off in time, the arc will often continue to burn for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/08H02S50/10
CPCG01R31/1227G01R31/088H02S50/10Y02E10/50Y04S10/52
Inventor 王泽鲲王志新张永
Owner SHANGHAI JIAO TONG UNIV
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