Research Article Open Access

Takagi-Sugeno Fuzzy Gains Scheduled PI Controller for Enhancement of Power System Stability

Lokman H. Hassan, M. Moghavvemi and Haider A.F. Mohamed


Problem statement: Power system oscillations affect system stability and may lead to failure if not properly controlled. Approach: A Takagi-Sugeno Fuzzy Gains Scheduled Proportional and Integral (FGPI) controller was proposed for a Thyristor Controlled Series Capacitor (TCSC)-based stabilizer to enhance the power system stability. Linguistic rules and fuzzy inference mechanism are utilized to tune the controller parameters on-line in different operating states. The proposed controller was applied to a single machine infinite bus system represented by the Phillips-Heffron generator model. Simulation studies have been carried out using MATLAB Fuzzy Logic toolbox. Simulated Annealing-based Power System Stabilizer (SAPSS) and Simulated Annealing-based TCSC Stabilizer (SACSC) approaches were also simulated in this study and their results were compared with proposed controller. Results: The simulation results demonstrated that the proposed control scheme performs well and strongly control the power system under different loading conditions, disturbances and system parameter variations. Conclusion: The proposed controller is robust and more suitable for damping of low frequency oscillation and more effective in improving dynamic stability and voltage profile than the two other approaches.

American Journal of Applied Sciences
Volume 7 No. 1, 2010, 145-152


Submitted On: 7 September 2006 Published On: 31 January 2010

How to Cite: Hassan, L. H., Moghavvemi, M. & Mohamed, H. A. (2010). Takagi-Sugeno Fuzzy Gains Scheduled PI Controller for Enhancement of Power System Stability. American Journal of Applied Sciences, 7(1), 145-152.

  • 9 Citations



  • TCSC
  • low frequency oscillation
  • Takagi-Sugeno fuzzy control
  • gain scheduling control