Shielding method-based detecting method of fault point of photovoltaic generation system

Abstract

The invention discloses a shielding method-based detecting method of a fault point of a photovoltaic generation system and belongs to the field of detecting the fault of the solar photovoltaic generation system. Under the solar radiation condition, photovoltaic cell panels of a photovoltaic generation system set are externally shielded by a light shielding plate, and a measurement sequence of the total voltage of a series branch under the different shielding is obtained, the measurement sequence is subjected to bad value judgment, and the shielded photovoltaic cell panels, corresponding to the measurements judged as the bad values, are fault cell panels. The shielding method-based detecting method has the advantages that improvement to the conventional photovoltaic generation system is omitted, hardware configuration of the photovoltaic generation system is not required, the system circuit is not required to be disassembled during the detecting, and operation is simple and effective.

Description

technical field [0001] The invention belongs to the field of fault detection of solar photovoltaic power generation systems, in particular to a method for detecting fault points of photovoltaic power generation systems by using a masking method. Specifically, it is a method of detecting a module with degraded performance or a damaged battery panel in a photovoltaic power generation system by implementing external shading on a single battery panel in a photovoltaic array. It is suitable for fault point detection of photovoltaic power generation systems with multiple sets of series and parallel connections and photovoltaic systems with concealed or closed installation of connection lines. Background technique [0002] Photovoltaic power plants are mostly composed of hundreds or thousands of photovoltaic panels connected in series and parallel. The stability and output power of photovoltaic power plants are related to the working status of each photovoltaic cell. Photovoltaic...

AI Technical Summary

Problems solved by technology

The circuit method detection system uses voltage sensors and current sensors to detect the voltage and current values ​​of the photovoltaic string output lines at the combiner box to determine the string where the faulty plate is located. A large number of sensors are added to the design, which is not only costly but also impossible to implement fault diagnosis for photovoltaic systems without intelligent fault diagnosis devices

Therefore, there is still a lack of a simple method that can accurately determine the fault of the photovoltaic power generation system to the photovoltaic panel.

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