Photovoltaic panel shadow shielding diagnosis method based on IV curve scanning

The invention discloses a photovoltaic panel shadow shielding diagnosis method based on IV curve scanning. The method comprises the following steps of S1, carrying out string-level system efficiency analysis, namely calculating the string-level system efficiency according to the string real-time data, and carrying out the string IV curve scanning analysis and string output electric power dispersion rate analysis if the system efficiency is lower than a threshold value. The invention relates to the technical field of photovoltaic power stations, and the diagnosis method provided by the presentinvention mainly uses the measurement point data of the inverter string, and judges whether excessive dust accumulation or shadow shielding exists in the strings or not according to a series of algorithms, such as electric power distribution analysis, efficiency analysis, electric power dispersion rate analysis, voltage and current deviation analysis, etc., and by combining the string IV curve scanning to perform statisti