Safe operation method of photovoltaic power generation system, training method for artificial neural network and real-time detection method in safe operation method, and real-time detection device

A photovoltaic power generation system, artificial neural network technology, applied in photovoltaic system monitoring, photovoltaic power generation, biological neural network model and other directions, can solve the problems of poor flexibility, inaccurate detection results, high cost, and achieve convenient detection and accurate detection results. , the effect of low cost

Inactive Publication Date: 2015-03-11
EAST GRP CO LTD
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Problems solved by technology

Arcs are divided into DC arcs and AC arcs according to current properties. Since the application of AC started earlier, the current detection methods for AC fault arcs are quite mature, and related AC arc fault protection devices have also entered the market. However, in photovoltaic power generation systems The properties of DC arc and AC arc are very different. DC arc is a random and unstable signal without the periodic "flat shoulder" characteristic of AC current. The traditional detection method based on waveform or time domain characteristics is no longer applicable, so The detection of DC arc in photovoltaic power generation system is relatively difficult
[0003] The early DC fault arc detection

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  • Safe operation method of photovoltaic power generation system, training method for artificial neural network and real-time detection method in safe operation method, and real-time detection device

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Embodiment Construction

[0023] The structure of a photovoltaic power generation system is as follows: figure 1 , the photovoltaic array includes a plurality of photovoltaic strings, the direct current generated by them is combined by the combiner box, and then converted to the alternating current grid by the inverter.

[0024] In this embodiment, preferably, it is preset to sample DC current on the converging main road, so no matter whether an arc occurs on each branch inside the photovoltaic array or an arc occurs on the main road after multiple branches are converging, the collected current The signal can reflect the harmonic energy characteristics of the DC fault arc.

[0025] In order for the artificial neural network to have the ability to identify whether a DC fault arc occurs, it is necessary to use multiple sets of learning samples to train the artificial neural network. The steps to obtain each group of learning samples are as follows:

[0026] ——at the preset position in the photovoltaic ...

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Abstract

The invention relates to a safe operation method of a photovoltaic power generation system. The safe operation method comprises a training method for an artificial neural network for detecting a direct current failure arc of the photovoltaic power generation system, and a real-time detection method of the direct current failure arc of the photovoltaic power generation system, wherein the steps in the real-time detection method can be completed by establishing a functional module frame and using a computer program instruction to control a computer system. In order to accurately, simply and conveniently test the direct current failure arc in the photovoltaic power generation system, direct current obtained by sampling is converted into a frequency domain, the harmonic energy of the frequency domain within a set frequency band is computed, and then the artificial neural network judges whether the direct current failure arc happens according to the harmonic energy.

Description

technical field [0001] The invention relates to a method for safe operation of a photovoltaic power generation system, which includes a training method for artificial neural networks for detecting a DC fault arc in a photovoltaic power generation system, and a real-time detection method for a DC fault arc in a photovoltaic power generation system, wherein each step in the real-time detection method It can be accomplished by establishing a functional module framework and controlling the computer system by computer program instructions. Background technique [0002] In recent years, photovoltaic power generation systems have been widely used. Most installations of photovoltaic arrays utilize long strings of high-voltage DC power sources, which increases the safety issues related to arcing. Arc is a kind of gas discharge phenomenon, and arc discharge phenomenon often contains huge energy, which poses a threat to the safety of surrounding equipment and staff. Arcs are divided i...

Claims

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Application Information

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IPC IPC(8): H02S50/00G06N3/02
CPCG06N3/02H02S50/00Y02E10/50
Inventor 林方圆苏建徽徐海波戴云霞施永
Owner EAST GRP CO LTD
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