What are the critical parameters to monitor in a SCADA system for a solar power plant, and how can these parameters be used to identify and diagnose equipment failures?

A SCADA (Supervisory Control and Data Acquisition) system is used to monitor and control a solar power plant. Critical parameters to monitor include: DC voltage and current from each string or combiner box, AC voltage and current from inverters, inverter power output (both active and reactive), inverter status (e.g., operating, fault, idle), grid voltage and frequency at the point of interconnection, weather data (irradiance, temperature, wind speed), and ambient and ....