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In the current text, the author mentions "STATCOM", "UPFC", "power quality", and "disturbances". To expand on these concepts, we can note that STATCOM (Static Synchronous Compensator) is a device used to regulate voltage levels in power systems. UPFC (Unified Power Flow Controller) is another power electronics-based device that can control the power flow in a transmission line. Power quality refers to the stability and consistency of the voltage and current in an electrical system, while "disturbances" could refer to any sudden changes or disruptions in the power supply.
Therefore, the original text may be discussing the use of STATCOM and UPFC devices to regulate power quality and prevent disturbances in the electrical power system.