Design of UPFC-PSS Using Firefly Algorithm for Stability Improvement of Multi Machine System under Contingency

  • M. Ravindrababu Department of EEE, UCEK, JNTUK, Kakinada, Andhra Pradesh, India.
  • G. Saraswathi Department of EEE, UCEV, JNTUK,Vizianagaram, Andhra Pradesh, India.
  • K. R. Sudha Department of EE, AUCE, Andhra Uniersity, Andhra Pradesh, India.
Keywords: Power System Stabilizer (PSS), Firefly Algorithm (FFY), Genetic Algorithm (GA), Unified Power Flow Controller (UPFC), Pseudo Spectrum Analysis, Contingency


The multi machine power system, with the interconnection of number of generators and loads, has the dynamic stability as the important factor for maintaining the step with respect to the generators connected to it. The stability of individual machine, as well as, the stability of a generator with the other generators are more important terms. The supply of the damping torque required for getting the desired condition of stability enhancement is done by the power system stabilizer.  In this paper a new method is proposed for stability enhancement of a three machine nine bus system by using the coordinated application of the unified power flow controller and the power system stabilizer designed by using the Firefly algorithm. The improved stability performance of the tested multi machine system was compared with Genetic search algorithm approach without and with the application of the unified power flow controller. From the pseudo spectrum analysis, it is observed that the better improvement of the stability of the multi machine system is achieved by using the proposed method. From the step responses it can be deduced that the relative variations of inter machine states with unified power flow controller and firefly-based power system stabilizer are settled at a faster rate. The contingency analysis is performed to consider the non-linearity problem. The responses of the system with unified power flow controller and firefly based power system stabilizer are settled at a faster rate in the normal case, as well as, in the contingency cases, respectively.


[1] Ravindrababu.M, G.saraswathi, K.R.Sudha “Design of Firefly based stabilizer based on pseudo spectrum Analysis” International journal on Electrical Engineering And Informatics, Volume 9, Number 1, March 2017, 195-206, March 2017.
[2] Xin-She Yang “Nature-inspired Metaheuristic Algorithms” University of Cambridge, United Kingdom, Text book.
[3] Babaei, E. ; Fac. of Electr. & Comput. Eng., Univ. of Tabriz, Tabriz, Iran ; Galvani, S. ; Ahmadi Jirdehi, M. “Design of robust power system stabilizer based on PSO” Industrial Electronics & Applications, 2009. ISIEA 2009. IEEE conference(Volume:1 )pp325-330.
[4] Gurunath Gurrala , Graduate Student Member, IEEE, Indraneel Sen “Power System Stabilizers Design for Interconnected Power Systems” IEEE transactions on power systems, vol. 25, no. 2, may 2010.
[5] Mehran Rashidi, Farzan Rashidi, Hamid Moaavar, “Tuning of Power System Stabilizers via Genetic Algorithm for Stabilization of power Systems”, 2003 IEEE Transactions pp 4649-4654.
[6] Adrian Andreoiu, Student Member, Kankar Bhattacharya, “Lyapunov's Method Based Genetic Algorithm for Multi-machine PSS Tuning” IEEE Power Engineering Society Winter Meeting, 2002 pp1495-1500.
[7]. P. M. Anderson and A. A. Fouad, Power System Control and Stability, Chapter 8, Iowa State University Press, Ames, Iowa, 1977.
[8] Chintalapudi V. Suresh,Sirigiri Sivanagaraju, “Analysis and effect of multi-fuel and practical constraints on economic load dispatch in the presence of Unified Power Flow Controller using UDTPSO”, Ain Shams Engineering Journal (2015) 6, 803–817.
[9] P.L. Pandeno, A.N. Karas, K.R. Mc Clymontand W.Watson, "Effect of high-speed rectifier excitation systems on generator stability limits", IEEE Transactions on Power Apparatus and Systems, Vol. PAS- 87, pp. 190-201, January 1968.
[10] F. R. Schleif, H.D. Hunkins, E. E. Hattan and W. B. Gish, "Control of rotating exciters for power system damping: Pilot applications and experience", IEEE Transactions on Power Apparatus and Systems, Vol. PAS-88, pp. 1259-1266, August 1969.
[11] Y. N. Yu, K. Vongsuriya and L. N.Wedman, "Application of an optimal control theory to a power system" IEEE Transactions on Power Apparatus and Systems, Vol. PAS-89, pp. 55-62, January 1970.
[12] J. H. Anderson, "The control of a synchronous machine using optimal control theory", Proc. EEE, Vol.59, pp.25-35, January1971.
[13] Y. N. Yu and C. Siggers, "Stabilization and optimal control signals for a power system", IEEE Transactions on Power Apparatus and Systems, Vol. PAS-90, pp. 1469-1481, July/August 1971.
[14] R. J. Fleming, M. A. Mohan and K.Parvatisam, "Selection of Parameters of Stabilizers in Multimachine Power Systems", IEEE Transactions on Power Apparatus and Systems, Vol. PAS-100, pp.2329-2333, May 1981.
[15] H.A.M. Moussa and Y. N. Yu, "Dynamic Interaction of Multi-Machine Power System and Excitation Control", IEEE Transactions on Power Apparatus and Systems, Vol. PAS-93, pp. 1150-1158, July/ August 1974.
[16] D.E.Goldberg, "Genetic Algorithm in search, Optimization And Machine Learning", Addison-Wesely, Reading MA , 1989.
[17] H. A. M. Moussa and Y. N. Yu, "Optimal power system stabilization through excitation and/or governor control", IEEE Transactions on Power Apparatus and Systems, Vol. PAS-91, pp. 1166-1174, May/June 1972.
[18] M. Hassan, 0. P. Malik, and G. S. Hope, “A fuzzy logic based stabilizer for a synchronous machine,” IEEE Trans. EC, vol. 6, no. 3, 1991, pp. 407-413.
[19] W.D. Humpage, J. R. Smith and G.J. Rogers, "Application of dynamic optimization to synchronous generator excitation controllers", Proc IEE Vol. 120, pp. 87-93, January 1973.
[20] Y. N. Yu and H. A. M. Moussa, "Optimal Stabilization of a Multi machine System", IEEE Transactions on Power Apparatus and Systems, Vol. PAS-91, pp.1174-1182, May/June 1972.
[20] A.B.Adbennonr and K.Lee, "A Decentralized Controller Design For a Power Plant Using Robust Local Controllers And Functional Mapping", FEET-Energy Conversion, Vol.11, No.2, pp. 394-400, June 1996.
[22] K.R. Padiyar, “Power System Dynamics Stability and Control", Second edition, BS Publications.
[23] P.Kundur, “Power System Stability andcontrol”,Tata mecgrawhill, Text book.
[24] AbdulMahabuba,AbdullahKhan“ Identification of the Optimum Locations of Power System Stabilizers in a Multi machine Power System Using Second Order Eigen value Sensitivity Analysis” Smart Grid and Renewable Energy, 2013, 4, 35-42Published Online February 2013.
[25] I.E.S Naidu “Identification Of Limit Cycles For The Design Of Type-2 Fuzzy Logic Power System Stabilizer” dissertation, Andhra University,2017.
[26] Yang Liu, Q. H. Wu, Fellow, IEEE, Haotian Kang, Xiaoxin Zhou, Fellow, CSEE, Fellow, IEEE, “Switching Power System Stabilizer and Its Coordination for Enhancement of Multi-machine Power System Stability”, CSEE Journal Of Power And Energy Systems, VOL. 2, NO. 2, JUNE 2016.
[27] Gustavo K. Dill, Student Member, IEEE, and Aguinaldo S. e Silva, Member, IEEE “Power System Stabilizer Design Using Optimization and Pseudo spectra” Paper accepted for presentation at the 2011 IEEE Trondheim Power Tech.
[28] Divya Asija, Pallavi Choudekar, K.M.Soni, S.K. Sinha Amity University, Noida (UP) “Power Flow Study and Contingency status of WSCC 9 Bus Test System using MATLAB” 2015 International Conference on Recent Developments in Control, Automation and Power Engineering (RDCAPE).
How to Cite
Ravindrababu, M., Saraswathi, G., & Sudha, K. R. (2019). Design of UPFC-PSS Using Firefly Algorithm for Stability Improvement of Multi Machine System under Contingency. Majlesi Journal of Electrical Engineering, 13(2), 21-39. Retrieved from