FAULT DIAGNOSIS METHOD AND TROUBLE DIAGNOSIS SYSTEM FOR A PHOTOVOLTAIC PLANT

摘要

A fault diagnosis system is configured to calculate an estimated irradiance on a first photovoltaic string and an estimated operating temperature of the first photovoltaic string based on a short-circuit current and an open-circuit voltage on a current-voltage characteristic of the first photovoltaic string and the first photovoltaic string Output voltage value of the device and the output current value of the device, which are measured by the device-measuring device. The fault diagnosis system is configured to calculate an estimated current value of the first photovoltaic string based on the estimated irradiance, the estimated operating temperature, and the current-voltage characteristic. The fault diagnosis system is configured to diagnose degradation of the first photovoltaic string by the comparison between the measured current value of the first photovoltaic string and the estimated current value.