Method and device for evaluating power performance of photovoltaic system

The invention relates to a photovoltaic system power performance evaluation method and device, and the method comprises the steps: collecting and recording historical operation data and real-time operation data of a photovoltaic system and corresponding environmental factor measurement data, carrying out the cleaning and standardization of the data, carrying out the principal component analysis, and carrying out the calculation of the power performance of the photovoltaic system. Calculating the attenuation rate of the power generation power ratio of each power generation unit of the photovoltaic system at a certain moment along with time, converting the attenuation rate into an annual attenuation rate, carrying out the statistics of the annual attenuation rate of the system through a regression model, positioning an abnormal unit, and analyzing the time and cause of abnormality, thereby achieving the power performance attenuation evaluation of the photovoltaic system. The method has the ...