Feasibility Study for STATCOM’S Capacitor Selection for Voltage Sag Mitigation

three phase sag sag Abstract— Voltage sags are the most common disturbances associated with power quality. They are caused by short circuits, starting large machines, or energizing a transformer. The main existing technologies for mitigating voltage sag are briefly illustrated. Static Compensators (STATCOM) and dynamic voltage resistors (DVR) are good economic solutions to mitigate voltage sags based on their capabilities. Mitigating devices affect the power flow and voltage profile conditions at both, utility equipment and customers. The impact is on the system voltage profile and on system losses. Using PASCAD/EMTDC, different ratings concerning the capacitor of STATCOM used have been considered and applied to the IEEE 9-bus system. The analysis and studies are carried out in normal and abnormal operating system states. Life cycle cost, maintenance types, and cost are discussed. The status of components of any equipment and its operation condition during its life period is illustrated. The procedure for a feasibility study of STATCOM's capacitor rating selection and economics for voltage sag mitigation is illustrated.