Research Article Open Access

Improvement of Transient Stability of Power System by Thyristor Controlled Phase Shifter Transformer

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


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

American Journal of Applied Sciences
Volume 7 No. 11, 2010, 1495-1499


Submitted On: 19 September 2010 Published On: 8 November 2010

How to Cite: Kumkratug, P. (2010). Improvement of Transient Stability of Power System by Thyristor Controlled Phase Shifter Transformer. American Journal of Applied Sciences, 7(11), 1495-1499.

  • 8 Citations



  • Power system
  • transient stability
  • FACTS devices
  • shunt transformer
  • injected current
  • Unified Power Flow Controller (UPFC)
  • series transformer
  • voltage source
  • leakage reactance
  • control strategy
  • complex power