Fault diagnosis method and system for photovoltaic station

The embodiment of the invention provides a fault processing method and system for a photovoltaic station, and belongs to the technical field of photovoltaic station operation and maintenance. The method comprises the following steps: acquiring operation information of each equipment unit in a photovoltaic station, and synchronizing the operation information of each equipment unit to obtain monitoring information; processing the monitoring information, and judging whether the monitoring information is abnormal or not; when the monitoring information is abnormal, similar fault positioning is carried out based on a preset secondary fault library, and a fault processing scheme corresponding to the abnormity is determined and output based on the positioned similar faults; if the similar fault positioning result does not exist, outputting alarm information; and in response to the trigger signal after the fault is eliminated, stopping alarming, recovering a fault processing scheme, and updating the secondary fault l