Investigation of transient stability of multi machine power systems with multiple UPFC

This study examines the impact of multiple UPFC on transient stability of a power system. A real based multi machine-65 bus system is modeled and analyzed with Unified Power Flow Controller (UPFC). The placement of the compensators is determined based on the transmission lines with highest voltage drop in the system. Transient stability effects are analyzed for three system cases, one without compensators, one with one compensator at a time and the last one with multiple compensators. Angle, angular speed of rotors and voltage of each bus is observed. The simulation results showed that the system with multiple compensators can damp oscillations more effectively, which makes the system in a more reliable operation.