Research Article Open Access

Power System Stability Enhancement Using Unified Power Flow Controller

Prechanon Kumkratug1
  • 1 Department of Electrical Engineering, Faculty of Engineering at Si Racha, Kasetsart University, 199 M.6, Tungsukhla, Si Racha, Chonburi, 20230, Thailand


Problem statement: The enhancement of transient stability of the power system is one of the most challenging research areas in power engineer. Approach: This study presents the method to enhance transient stability of power system by Unified Power Flow Controller (UPFC). The mathematical model of power system equipped with a UPFC is systematically derived. The parameters of UPFC are modeled into power flow equation and thus it is used to determine control strategy. The swing curves of the three phase faulted power system without and with a UPFC are tested and compared in various cases. Results: The swing curve of system without a UPFC gets increases monotonically and thus the system can be considered as unstable whereas the swing curves of system with a UPFC can return to stable equilibrium point. Conclusion: From the simulation results, the UPFC can enhance transient stability of power system.

American Journal of Applied Sciences
Volume 7 No. 11, 2010, 1504-1508


Submitted On: 25 October 2010 Published On: 8 November 2010

How to Cite: Kumkratug, P. (2010). Power System Stability Enhancement Using Unified Power Flow Controller. American Journal of Applied Sciences, 7(11), 1504-1508.

  • 2 Citations



  • Power system
  • Unified Power Flow Controller (UPFC)
  • transient stability
  • High Voltage Direct Current (HVDC)
  • Flexible AC Transmission System (FACTS)
  • injected current
  • thyristor controlled phase shifter
  • series transformer
  • voltage source
  • leakage reactance
  • equivalent circuit