Time-based detection method for shaded parts of photovoltaic panels

Abstract

The invention provides a detection method of a photovoltaic cell panel shading portion based on a time interval and belongs to the field of photovoltaic power generation. The detection method of the photovoltaic cell panel shading portion based on the time interval includes the following steps: S1, judging whether the current time is in a time quantum from sunrise to sunset, collecting a practical image A of the photovoltaic cell panel when the current time is in the time quantum from sunrise to sunset, otherwise finishing the operation; S2, comparing the practical image A which is conducted grey processing with an original image B, wherein the original image B refers to a grayscale image without a shadow portion, finishing the operation when the practical image A which is conducted grey processing is identical with the original image B, and conducting image cutting on the shadow portion of the practical image A when the practical image A which is conducted grey processing is different from the original image B, and obtaining a shading area of the photovoltaic cell panel. The detection method of the photovoltaic cell panel shading portion based on the time interval collects the practical image of the photovoltaic cell panel only in the time quantum from sunrise to sunset, reduces detection energy consumption, conducts image cutting by combining a K-means clustering method and a firmware control memory (FCM) method based on one-dimensional histogram and improves precision and speed of image cutting.

Description

technical field [0001] The present invention relates to a photovoltaic power generation system, in particular to a detection method for the shading part of a photovoltaic battery panel based on a time period. Background technique [0002] In the popularization process of photovoltaic power generation system, the key lies in how to improve the utilization rate of solar energy. Photovoltaic power generation systems will inevitably be blocked by shadows such as trees, tall buildings, clouds, and birds during the working process. safe question. In partial shading conditions, the maximum power point tracking method is an effective method to increase the output power of photovoltaic panels. The current maximum power point tracking method is to make the photovoltaic cell array always work near the maximum power point by assuming a shadow area, so as to improve the power generation efficiency. Therefore, the traditional maximum power point tracking method assumes that the shadow a...

AI Technical Summary

Problems solved by technology

The current maximum power point tracking method is to make the photovoltaic cell array always work near the maximum power point by assuming a shadow area, so as to improve the power generation efficiency. Therefore, the traditional maximum power point tracking method assumes that the shadow area cannot truly reflect the photovoltaic shaded part of the battery

[0003] In addition, in the traditional maximum power point tracking method, it is also necessary to collect the shading degree of all photovoltaic cells in the photovoltaic panel, which requires a large number of light intensity sensors to collect multiple signals, which undoubtedly increases the cost of photovoltaic power generation systems.

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