Photovoltaic system direct-current arc fault detection method, device, processor and system

A photovoltaic system and DC arc technology, applied in the monitoring of photovoltaic systems, photovoltaic power generation, measuring devices, etc., can solve the problems of easy misjudgment, inability to adapt to the operating environment of photovoltaic systems, and increased current noise, so as to improve detection accuracy Effect

Active Publication Date: 2014-10-08
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The DC arc fault will increase the current noise in the DC cable of the photovoltaic system, so the existing DC arc fault detection method is to judge the presence or absence of the DC arc fault according to the size of the current noise; but its defect is that Using a fixed threshold to judge the size of the current noise cannot adapt to the changing operating environment of the photovoltaic system at all, and it is prone to misjudgment

Method used

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  • Photovoltaic system direct-current arc fault detection method, device, processor and system
  • Photovoltaic system direct-current arc fault detection method, device, processor and system
  • Photovoltaic system direct-current arc fault detection method, device, processor and system

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Embodiment 1

[0049] see figure 1 , Embodiment 1 of the present invention discloses a method for detecting a DC arc fault in a photovoltaic system to improve the detection accuracy of a DC arc fault in a photovoltaic system, including:

[0050] Step 101: Obtain the operating parameters of the photovoltaic system;

[0051] Step 102: Obtain the current noise signal in the DC cable of the photovoltaic system; the execution sequence between step 102 and step 101 is not limited, and this embodiment only provides one execution sequence;

[0052] Step 103: Adjusting a threshold according to the operating parameters, the threshold is used to judge whether the current noise signal has arc characteristics;

[0053] Step 104: Using the threshold value to judge whether the current noise signal has arc characteristics; when the current noise signal has arc characteristics, enter step 105, otherwise return to step 101;

[0054]Step 105: Send out a DC arc fault signal of the photovoltaic system.

[005...

example 1

[0072] The first criterion includes: counting the number of points whose amplitude is greater than a first threshold among the plurality of discrete frequency points; judging whether the number of points is greater than a second threshold, and when the number of points is greater than the second threshold, It is determined that the current noise signal has an arc characteristic. Correspondingly, see Figure 4 , using the photovoltaic system DC arc fault detection method of the first criterion, including:

[0073] Step 401: Obtain the operating parameters of the photovoltaic system;

[0074] Step 402: Obtain the current noise signal in the DC cable of the photovoltaic system;

[0075] Step 403: Adjusting a threshold according to the operating parameters, the threshold is used to judge whether the current noise signal has an arc characteristic;

[0076] Step 404: Calculate the frequency spectrum of a frequency segment according to the current noise signal to obtain a pluralit...

example 2

[0081] The second criterion includes: calculating the average amplitude of the multiple discrete frequency points; counting the number of points among the multiple discrete frequency points that meet the preset requirements, wherein the meeting the preset requirements refers to the The absolute value of the difference between the amplitude of the frequency points and the average amplitude is less than a third threshold; determine whether the number of points is greater than a fourth threshold, and when the number of points is greater than the fourth threshold, determine the current noise signal Has arcing characteristics. Correspondingly, see Figure 5 , using the second criterion for detecting DC arc faults in photovoltaic systems, including:

[0082] Step 501: Obtain the operating parameters of the photovoltaic system;

[0083] Step 502: Obtain the current noise signal in the DC cable of the photovoltaic system;

[0084] Step 503: Adjusting a threshold according to the op...

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Abstract

The invention discloses a photovoltaic system direct-current arc fault detection method. The method includes the steps of obtaining operation parameters of a photovoltaic system and current noise signals in photovoltaic system direct-current cables respectively, adjusting a threshold according to the operation parameters, and sending out photovoltaic system direct-current arc fault signals when it is judged that the current noise signal has an arc feature through the threshold, wherein the threshold is used for judging whether the current noise signal has the arc feature. Accordingly, photovoltaic system direct-current arc fault detection precision is improved. Besides, the invention further discloses a photovoltaic system direct-current arc fault detector, a processor and a photovoltaic system direct-current arc fault detection system.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically, to a photovoltaic system DC arc fault detection method, device, processor and system thereof. Background technique [0002] The DC arc fault of the photovoltaic system is a DC arc discharge phenomenon caused by the poor contact of the conductor on the DC side of the photovoltaic system. Since DC arc is a free gas with high temperature and high conductivity, it is very easy to cause electric shock hazards, equipment damage and fire accidents, so DC arc fault detection is extremely important for photovoltaic systems. [0003] The DC arc fault will increase the current noise in the DC cable of the photovoltaic system, so the existing DC arc fault detection method is to judge the presence or absence of the DC arc fault according to the size of the current noise; but its defect is that Using a fixed threshold to judge the magnitude of the current noise can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/00G01R31/50
CPCH02S50/10Y02E10/50G01R31/50H02S50/00G01R29/26
Inventor 俞雁飞倪华赵为周岩峰
Owner SUNGROW POWER SUPPLY CO LTD
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