Photovoltaic system direct current side arc fault detection apparatus and detection method

A technology for arc faults and photovoltaic systems, applied in the field of arc fault detection devices on the DC side of photovoltaic systems, to achieve the effect of preventing misjudgments and missed judgments

Pending Publication Date: 2017-10-24
上海岩芯电子科技有限公司
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Problems solved by technology

[0006] The invention provides a photovoltaic system DC side arc fault detection device and a detection method thereof, aiming to solve the problem of accurately detecting fault arcs when a DC arc fault occurs in a photovoltaic system

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  • Photovoltaic system direct current side arc fault detection apparatus and detection method

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Embodiment Construction

[0024] In order to describe the present invention more specifically, preferred embodiment is hereby described in detail in conjunction with accompanying drawings as follows:

[0025] figure 2 A photovoltaic array fault arc detection method, comprising the following steps:

[0026] (1) During the operation of the photovoltaic system, a current transformer is used to sample the current of the DC bus at the output of the photovoltaic array.

[0027] (2) Perform high-pass filtering on the above-mentioned current sampling signal through a hardware filter circuit, filter out signal components below 20 kHz, and obtain a current sampling high-frequency signal;

[0028] (3) For the above-mentioned current sampling high-frequency signal, the analog signal is converted into a digital signal by the ADC sampling chip and sent to the DSP digital signal processor to be substituted into the arc fault detection algorithm for arc fault detection, wherein the sampling rate of the ADC sampling ...

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Abstract

The invention provides a photovoltaic system direct current side arc fault detection apparatus and detection method. A current signal of a photovoltaic system direct current bus is collected; algorithm decomposition is performed by ensemble empirical mode decomposition (EEMD), and front three layer IMF time sequence capable of representing fault arc characteristics is extracted to be used as the characteristic component of the fault arc; the time sequence IMF is subjected to entropy value acquisition based on a fuzzy entropy algorithm to establish fault characteristic vectors E1, E2 and E3; data in normal operation and clustering centers V1 and V2 of fault arc data are solved by adopting a fuzzy C mean value clustering algorithm; and fault arc detection is performed according to Euclidean distances of signals and different clustering centers. The invention also provides the photovoltaic system direct current side arc fault detection apparatus, wherein the apparatus comprises a sampling unit, a data processing unit and a control unit. Therefore, harm to the system caused by the photovoltaic system direct current side fault arc can be lowered to a large extent.

Description

Technical field: [0001] The invention belongs to the field of photovoltaic grid-connected fault detection, and in particular relates to a photovoltaic system DC side arc fault detection device and a detection method thereof. Background technique: [0002] With the rapid development of photovoltaic power generation, some serious problems have also emerged, among which the electrical system safety problems caused by the aging of photovoltaic modules are particularly prominent. After research, it is found that most of the fire accidents in photovoltaic systems are related to DC fault arcs. The photovoltaic system has a complex structure and a large number of connected devices, and the DC terminal voltage can reach more than 1000V. Once an arc fault occurs, it is very likely to instantly ignite the surrounding combustibles or photovoltaic modules and cause a fire accident. In order to solve such safety problems, the US National Electrical Code NEC (National Electrical Code) No....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/00G01R31/12
CPCH02S50/00G01R31/12Y02E10/50
Inventor 徐文新柴立超吴春华
Owner 上海岩芯电子科技有限公司
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