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A photovoltaic system arc fault identification method and device

A technology of arc fault and photovoltaic system, which is applied in the monitoring of photovoltaic systems, photovoltaic power generation, photovoltaic modules, etc., and can solve the problems of high malfunction rate of circuit breakers and misjudgment of current fluctuations

Active Publication Date: 2020-07-07
GUANGDONG POWER GRID CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides a photovoltaic system arc fault identification method and device, which is used to solve the problem that the existing arc fault detection method is easy to misjudge short-term current fluctuations as arc faults during the start-up and power changes of the photovoltaic system, resulting in open circuit Technical problems with high device malfunction rate

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  • A photovoltaic system arc fault identification method and device
  • A photovoltaic system arc fault identification method and device
  • A photovoltaic system arc fault identification method and device

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Embodiment Construction

[0058] The embodiment of the present application provides a photovoltaic system arc fault identification method and device, which is used to solve the problem that the existing arc fault detection method is easy to misjudge the short-term current fluctuation as a fault arc when the photovoltaic system is started and the power is changing. Technical problems leading to high malfunction rate of circuit breakers.

[0059] In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the following The described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without...

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Abstract

The present invention discloses a photovoltaic system fault arc identification method and device. The photovoltaic system fault arc identification method performs extraction and detection of continuous current signals through a lot of time windows to properly prolong an arc detection range and effectively distinguish the fault arc and a transient arc-similar state so as to reduce the misjudgment rate of the fault arcs, improve the stability of the operation of the photovoltaic system and solve the technical problem that a current fault arc detection method easily determines short-term currentfluctuation as fault arcs by mistake in the process of starting and power change of the photovoltaic system to cause the high misoperation rate of a circuit breaker.

Description

technical field [0001] The present application relates to the field of electrical detection, and in particular to a method and device for identifying a fault arc in a photovoltaic system. Background technique [0002] As the development technology of green energy matures year by year, light energy, as a clean and renewable energy, has been widely used in our country. The ionized gas will cause the components around the fault arc to burn, further causing a fire, resulting in a decrease in the working efficiency of the photovoltaic power generation system, and posing a threat to personal and property safety. [0003] Existing arc fault detection methods include time domain and frequency domain detection methods. However, since the photovoltaic system starts and changes in power, the current change in a short period is similar to the characteristics of an arc fault, and it is easy to misjudge the short-term current fluctuation as an arc fault, resulting in a high rate of circu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S50/00
CPCY02E10/50
Inventor 李丽唐念樊小鹏邹庄磊周永言
Owner GUANGDONG POWER GRID CO LTD