Electric arc fault detection method and device for photovoltaic inverter and photovoltaic inverter

A photovoltaic inverter and arc fault technology, applied in photovoltaic system monitoring, photovoltaic power generation, measuring devices, etc., can solve problems such as economic losses for users

Active Publication Date: 2016-11-23
DELTA ELECTRONICS SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the inverter is a switching power supply, the switching action will generate high-frequency interference signals. The method of judging whether an arc occurs through the frequency dom

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  • Electric arc fault detection method and device for photovoltaic inverter and photovoltaic inverter
  • Electric arc fault detection method and device for photovoltaic inverter and photovoltaic inverter
  • Electric arc fault detection method and device for photovoltaic inverter and photovoltaic inverter

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Embodiment Construction

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms, and should not be construed as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that the present invention will be comprehensive and complete, and fully convey the concept of the example embodiments To those skilled in the art. The same reference numerals in the figures indicate the same or similar structures, and thus their repeated description will be omitted.

[0029] The described features and structures can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to give a full understanding of the embodiments of the present invention. However, those skilled in the art should realize that without one or more of the specific details, or using other methods, components, etc., the t...

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Abstract

The invention discloses an electric arc fault detection method and device for a photovoltaic inverter and a photovoltaic inverter. The electric arc fault detection method comprises steps of obtaining a photovoltaic inverter DC side current signal, obtaining a current signal frequency spectrum characteristic according to the current signal, determining whether the current signal frequency spectrum characteristic has an arc spectrum characteristic, shutting down the photovoltaic inverter if the current signal spectrum characteristic has the electric arc spectrum characteristic, obtaining first input voltage when the photovoltaic inverter is shut down and obtaining second input voltage since the shutting down until after preset time, calculating voltage drop between the first input voltage and the second input voltage, and determining whether an arc fault happens according to the voltage drop. The arc fault detection method and device for the photovoltaic inverter and the photovoltaic inverter can effectively reduce misjudgment on the arc fault because of interference of the inverter and solves a false triggering problem of the corresponding protection device.

Description

Technical field [0001] The invention relates to the field of photovoltaic power generation, and in particular to a method and device for detecting an arc fault of a photovoltaic inverter, and a photovoltaic inverter. Background technique [0002] In the field of photovoltaic power generation, photovoltaic panels are usually installed on the roof of buildings, and DC arcs may occur due to moisture, damage to the insulation of wires, and loose terminals. The direct current arc will produce a high-temperature open flame, which can cause a fire. Therefore, in the field of photovoltaic power generation, photovoltaic inverters need to add arc detection equipment or support arc detection functions. [0003] The current common method of arc detection is to detect the DC current on the DC side of the inverter and determine whether an arc occurs according to the frequency domain characteristics of the DC current. However, because the inverter is a switching power supply, the switching acti...

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Application Information

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IPC IPC(8): G01R31/12H02S50/10
CPCG01R31/1227G01R31/42H02S50/00H02S50/10Y02E10/50
Inventor 朱选才徐飞冬
Owner DELTA ELECTRONICS SHANGHAI CO LTD
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