Photovoltaic power plant string anomaly alarming method and alarming device

Abstract

The invention provides a photovoltaic power plant string anomaly alarming method, which comprises the following steps: A, the historical data of each combiner box in a point station are extracted, thecurrent values of all strings in the combiner box are subjected to abnormal state judgment, and a state matrix for all strings is saved; B, the abnormal current values in the state matrix are extracted, periodic analysis is carried out, shadow occlusions are classified and marked according to a periodic analysis result, and based on the marked result, a device image is completed; and C, whether current of all strings under each combiner box is abnormal is judged in real time, if current of a certain path of string is abnormal, the device image of the string in the combiner box is extracted, and based on the comparison result between the abnormal moment and the device image, whether to be reported as a fault is judged. On the basis of automatically judging the fault state of each string, aperiodic abnormal fluctuation phenomenon caused to the string by the shadow occlusion can be effectively avoided through the device image technology, and the alarm accuracy is improved.

Description

technical field [0001] The invention relates to a fault alarm technology for photovoltaic power plant strings, in particular to a method and an alarm device for abnormal alarming of photovoltaic power plant strings based on equipment portraits. Background technique [0002] The fault real-time alarm technology of photovoltaic strings can realize fully automatic and accurate identification and positioning of photovoltaic power generation system faults, and help photovoltaic power plants to quickly, accurately and Low-cost diagnosis of group string faults has broad application prospects. [0003] The current PV string failure real-time alarm technology usually uses methods such as correlation analysis of current values ​​of different strings and setting of empirical thresholds to detect and judge in real time that there is a large difference between the PV string and the preset value. abnormal string current value, and alarm it as a fault. However, in the actual operation of...

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Problems solved by technology

For this phenomenon, if the traditional fault alarm method is still used, a large number of false alarms will be triggered, which will seriously interfere with the work efficiency of operation and maintenance personnel.

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