Active photovoltaic string arc fault detection method and system

A technology of arc fault and detection method, which is applied in the monitoring of photovoltaic systems, photovoltaic power generation, photovoltaic modules, etc., can solve the problems of unguaranteed reliability and inability to adapt, and achieve the effect of reducing misjudgment rate and strong anti-interference

Active Publication Date: 2021-12-10
SHANGHAI JIAOTONG UNIV +1
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Problems solved by technology

However, it cannot adapt to the joint action of multiple environmental factors, and cannot guarantee high reliability when it involves changes in multiple influencing factors

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  • Active photovoltaic string arc fault detection method and system
  • Active photovoltaic string arc fault detection method and system

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[0023] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0024] Such as Figure 1-2 As shown, an active photovoltaic string arc fault detection method provided by the present invention includes: actively injecting a signal step: actively generating a high-frequency signal, and actively outputting a high-frequency signal on the photovoltaic string side through coil coupling; Signal acquisition step: measure and record the current signal on the DC bus on the photovoltaic string side to obtain current signal information on the DC bus on the photovoltaic string s...

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Abstract

The present invention provides an active photovoltaic string arc fault detection method and system, including: active signal injection step: actively generate high-frequency signal, and actively output high-frequency signal on the photovoltaic string side; current signal collection step: in the photovoltaic string Measure and record the current signal on the DC bus on the string side to obtain the current signal information on the DC bus on the PV string side; arc fault judgment steps: perform wavelet transform processing and analyze the wavelet transform processing according to the current signal information on the DC bus on the PV string side After the signal characteristics, the wavelet transform processed signal characteristics are compared with the input high-frequency signal to determine whether an arc fault has occurred in the photovoltaic string, and obtain the active photovoltaic string arc fault detection result information. The invention performs detection on the side of the photovoltaic group string, and fundamentally solves the influence of inverter noise and different operating conditions on the detection.

Description

technical field [0001] The present invention relates to the technical field of arc fault detection, in particular to an active photovoltaic string arc fault detection method and system. Background technique [0002] In recent years, with the improvement of my country's environmental protection requirements and the advancement of renewable energy power generation technology, the scale of clean energy utilization has been enlarged and developed rapidly. For example, as of 2019, the cumulative installed capacity of photovoltaic power generation in my country has reached 204GW, ranking first in the world. However, due to arc faults in photovoltaic strings, frequent fire accidents in photovoltaic power stations have resulted in huge economic losses and serious personal safety hazards, which have attracted the attention of the industry. At present, there are two main detection technologies for arc faults in photovoltaic strings: one is based on the detection method of physical pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S50/10
CPCH02S50/10Y02E10/50
Inventor 沈江明王志新张永王泽鲲
Owner SHANGHAI JIAOTONG UNIV
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