Patent ID: 9048781
Filing Date: 2015-06-02
Classification: H02S,Y02E

Abstract:
1. An abnormality diagnosis device for a photovoltaic power generation system which controls power generation using a plurality of subsystems each including a plurality of power generation modules being interconnected, comprising: a power output data storage configured to store power generation output data representing a current and a voltage of electrical power generated by each of the subsystems according to sampling time; an output data insolation-correcting unit configured to correct, for each of the subsystems, at least the current out of the current and the voltage in the power generation output data to a current corresponding to a standard insolation condition using insolation intensity data to generate insolation-corrected power generation data including a corrected current and either one of a corrected voltage or the voltage in the power generation output data; a gradient estimating unit configured to produce, for each of the subsystems, an approximation graph of the insolation-corrected power generation data and calculate a gradient of the approximation graph; an abnormality diagnosing unit configured to determine a subsystem for which the gradient satisfies a first threshold to be a subsystem including an abnormal module; and a feature calculating unit configured to calculate a feature which is different from the gradient based on the insolation-corrected power generation data for each of the subsystems, wherein the abnormality diagnosing unit determines a subsystem for which the gradient satisfies the first threshold or the feature satisfies a second threshold to be the subsystem including the abnormal module.