A Comparison of STATCOM and Modified UPFC Three-Level Inverters in Renewable Energy

For the electricity system to remain stable, voltage stability must be maintained. A decrease in reactive power is the primary cause causing stability loss in some regions of the power network. The flexible AC transmission system (FACTS) devices can be used to improve the reactive power. This study focuses on using two separate FACTS devices: the static synchronous compensator (STATCOM) and modified unified power flow controller (UPFC) three-level inverter-based, to improve voltage profile issues such voltage sag, voltage swell, and total harmonic distortion at the load side. Although STATCOM and UPFC are both FACTS devices that are included in the power system as a kind of compensation, their operational concepts and impacts on the power system are different. This study presents a comparison of power quality based on an investigation of harmonics and voltage sag and swell.