Photovoltaic group string fault detection method and device

A technology for fault detection and photovoltaic groups, applied in the monitoring of photovoltaic systems, photovoltaic power generation, photovoltaic modules, etc., can solve the problems of slow speed and low accuracy, so as to reduce the false alarm rate of faults, improve accuracy, and improve fault detection speed effect

Active Publication Date: 2019-09-24
HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a photovoltaic string fault detection method and device to solve the technical problems of slow speed and low accuracy of current fault detection methods

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  • Photovoltaic group string fault detection method and device
  • Photovoltaic group string fault detection method and device
  • Photovoltaic group string fault detection method and device

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[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] See figure 1 , which shows a schematic structural diagram of a photovoltaic string fault detection system provided by an embodiment of the present invention, as shown in figure 1 As shown, the system includes a business server, a database, and photovoltaic strings; wherein, each photovoltaic string is provided with a data acquisition ...

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Abstract

The invention provides a photovoltaic group string fault detection method and device. The current of the same photovoltaic group string in a time series is used as a judgment basis so as to reduce the false alarm rate of the fault. Meanwhile, the current deviation rate is used as the basis of fault diagnosis to effectively eliminate the transient fault caused by weather factors (such as cloud cover) and improve the accuracy of fault detection. Moreover, the high-level current (such as the total current of the bus device) is the summary of the low-level current (such as the string current) and is susceptible to other factors so that the fault detection speed can be improved by using the ascending judgment order of current. Meanwhile, the accuracy of fault detection can be improved by the mode of ascending detection of current.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a photovoltaic string fault detection method and device. Background technique [0002] The photovoltaic string is the core component of the photovoltaic power generation system. The photovoltaic string is obtained by connecting multiple photovoltaic modules in series and / or in parallel. [0003] Photovoltaic modules may have faults such as splits, line aging, and hot spots. The current photovoltaic string fault detection methods mainly include infrared image detection methods, electrical signal detection methods, event-related detection methods, and sensor-based detection methods. However, the current fault detection method cannot quickly and accurately locate the faulty photovoltaic string, and the detection accuracy is low due to the inability to accurately identify the occlusion shadow. Contents of the invention [0004] In view of this, th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/10
CPCH02S50/10Y02E10/50
Inventor 张家前余婷婷周辉何乐
Owner HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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