Method for distinguishing inverter noise signal from direct-current arc signal based on signal echo device

A technology of direct current arc and echo, which is applied in the direction of instruments, measuring electricity, measuring electric variables, etc.

Inactive Publication Date: 2015-01-07
常州加伏沃新能源科技有限公司
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Problems solved by technology

However, due to the different installation positions of the detection equipment for DC arc faults, different types of photovoltaic equipment, and different locations of arc faults, etc., in some cases, the characteristic of arc faults may be covered in normal noise signals and cannot be well detected. come out

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  • Method for distinguishing inverter noise signal from direct-current arc signal based on signal echo device

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Embodiment Construction

[0016] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] In the figure, 1 is the DC arc fault detector, 2 is the signal echo, 3 is the photovoltaic panel, 4 is the photovoltaic inverter, 5 is the noise signal from the photovoltaic inverter, and 6 is the detection signal generated by the photovoltaic panel side. Signal, 7 is the noise signal returned by the signal echo, 8 is the differentiator in the DC arc fault detector 1, 9 is the arc fault judger in the DC arc fault detector 1, and 10 is the DC energy channel. In the figure, the DC fault detector 1 is installed between the photovoltaic panel 3 and the photovoltaic inverter 4, and the signal echo 2 is installed between the DC fault detector 1 and the photovoltaic panel 3, and the signal echo is performed through the DC energy channel 10 DC energy flow in detector 7 and DC arc fault detector 1. The noise signal 5 that may be generated by the photovol...

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Abstract

The invention relates to a method for distinguishing an inverter noise signal from a direct-current arc signal based on a signal echo device. Generally, for reliably detecting direct-current arc faults in a photovoltaic power generation system, which possibly cause the fire, a direct-current arc fault detector is required to reliably distinguish a noise signal from a direct-current arc fault signal on a circuit. According to the famous pink principle that a voltage frequency spectrum is in inverse relation to a current frequency spectrum when arc faults occur, the noise signal can be distinguished form the arc fault signal; when the intensity of the noise signal is excessively high to submerge the direct-current arc fault signal, the method provided by the invention is required, i.e., the signal echo device mounted between a photovoltaic panel and the direct-current arc fault detector is used, so that the noise signal of the inverter forms noise echo at the signal echo device; and an excessively-high noise signal is filtered from the noise echo and the noise signal through a differentiator in the direct-current arc fault detector and only an effective signal is retained for detecting the direct-current arc faults by the detector.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic electrical fault detection. More precisely, the invention relates to a method for distinguishing inverter noise signals and DC arc signals in a photovoltaic system by installing a signal echo. Background technique [0002] With the large-scale application of photovoltaic power generation, especially the widespread application of photovoltaic panels on building roofs and exterior walls, fires caused by photovoltaic power generation systems have occurred in many places. Through analysis, it is found that this type of fire is basically caused by the DC arc fault of the photovoltaic power generation system, so the detection and isolation of DC arc faults that cause equipment damage and fire hazards have become a problem that must be solved. Among them, reliable detection of DC arc faults has become a primary task to improve system safety and prevent fire hazards. In the arc signal spectrum, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 邵俊松
Owner 常州加伏沃新能源科技有限公司
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