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Photovoltaic string fault detection method and device

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

Active Publication Date: 2021-07-13
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 string fault detection method and device
  • Photovoltaic string fault detection method and device
  • Photovoltaic string fault detection method and device

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Embodiment Construction

[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, which uses the current of the same photovoltaic group string in time series as a judgment basis, thereby reducing the false alarm rate of faults. At the same time, using the current deviation rate as the basis for fault judgment can effectively eliminate short-term faults caused by weather factors (such as cloud cover) and improve the accuracy of fault detection. Moreover, since the large-level current (such as the total current of the busbar) is the sum of the small-level current (such as the string current), it is easily affected by other factors, so the judgment order of the current from small to large can improve the fault detection speed. At the same time, the accuracy of fault detection can be improved by adopting the method of multiple detection from small to large currents.

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 Patents(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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