Papers published (or accepted for publication) in journals listed in Science Citation Index (SCI)

  1. S. Ayasun and A. Gelen, "Stability Anaysis of a Generator Excitation Control System with Time Delays",  Electrical Engineering, Vol. 91, No. 6,  Jan. 2010 , pp. 347-355.

  2. S. Ayasun, "Computation of Time Delay Margin for Power System Small-Signal Stability," European Transactions on Electrical Power, Vol. 19, No.7, Nov. 2009, pp. 949-968.
  3. A. Gelen and S. Ayasun, " Realization of Power Electronic Converter Based DC Motor Speed Control Methods Using MATLAB/Simulink" Journal of Engineering Education, Vol. 25, No.1, January 2009, pp. 33-41.
  4. S. Ayasun “ Effects of Algebraic Singularities on the Voltage Dynamics of Differential-Algebraic Power System Model,” European Transactions on Electrical Power, Vol. 18, No. 6, October 2008, pp. 547-561. (pdf)
  5. S. Ayasun and G. Karbeyaz, “DC Motor Speed Control Methods Using Matlab/Simulink and their Integration into Undergraduate Electric Machinery Courses,” Computer Applications in Engineering Education, Vol. 15, No. 4, December 2007, pp. 347-354. (pdf)
  6. S.Ayasun, R. Fischl, S.Vallieu, Jack Braun, and D. Çadirli, "Modeling and stability analysis of a simulation-stimulation interface for hardware-in-the-loop applications," Simulation Modelling Practice and Theory, Vol. 15, No. 6, July 2007, pp 734-746. (pdf)
  7. S. Ayasun, C. O. Nwankpa, and Harry G. Kwatny, "Voltage Stability Toolbox for Power System Education and Research,” IEEE Transactions on Education, Vol. 49, No. 4, Nov. 2006, pp. 432-442. (pdf)
  8. S. Ayasun and C. O. Nwankpa, “Transformer Tests Using Matlab/Simulink and their Integration into Undergraduate Electric Machinery Courses,” Computer Applications in Engineering Education , Vol. 14, No. 2, 2006, pp. 142-150.(pdf)
  9. S. Ayasun, Yiqiao Liang, and C. O. Nwankpa, “A Sensitivity Based Method To Compute the Probability Density Function of Critical Clearing Time and Probability of Stability in Power System Transient Stability Analysis,” Applied Mathematics and Computation, Vol. 176, No. 2 May 2006, pp. 563-576.(pdf)
  10. S. Ayasun, C. O. Nwankpa, and Harry G. Kwatny, “An Efficient Method To Compute Singularity-Induced Bifurcations of Decoupled Parameter-Dependent Differential-Algebraic Power System Model,” Applied Mathematics and Computation, Vol. 167, No. 1, August 2005, pp. 435-453.(pdf)
  11. S. Ayasun and C. O. Nwankpa, “Induction Motor Tests Using Matlab/Simulink and their Integration into Undergraduate Electric Machinery Courses,” IEEE Transactions on Education, Vol. 48, No. 1, February 2005, pp. 37-46.(pdf)
  12. S. Ayasun, C. O. Nwankpa, and Harry G. Kwatny, “Computation of Singular and Singularity Induced Bifurcation Points of Differential-Algebraic Power System Model,” IEEE Transactions on Circuits and Systems-I: Regular Papers , Vol. 51, No.8, August 2004, pp. 1525-1538.(pdf)
  13. S. Ayasun, D. Phuntshok and C. O. Nwankpa, Discussion to “Transmission Analysis By Nash Game Method,” IEEE Transactions on Power Systems,Vol. 12, No. 3, 1997, pp. 1052.(pdf)

Papers presented in international conferences and published in their proceedings

  1. Saffet Ayasun and  Chika O. Nwankpa, "Probability of Small-Signal Stability of Power Systems in the Presence of Communication Delays," Proc. of International Conference on Electrical and Electronics Engineering (ELECO 2009),  pp. 70-74, Nov. 05-09, Bursa, TURKEY.
  2. Saffet Ayasun and Chika O. Nwankpa, "Stability of a Two-Area Automatic Generation Control System with Communication Delays," Proc. of International Conference on Electrical and Electronics Engineering (ELECO 2009), pp. 65-69, Nov. 05-09, Bursa, TURKEY.
  3. Saffet Ayasun and Ayetül Gelen,"Investigation of Damping Effect of Power System Stabilizer in the Presence of Communication Delays," 43rd Universities Power Engineering Conference, 01-04 September 2008, University of Padova, Padova, Italy.
  4. Ayetül Gelen and Saffet Ayasun,"Effects of PWM Chopper Drive on the Torque-Speed Characteristic of DC Motor," 43rd Universities Power Engineering Conference, 01-04 September 2008, University of Padova, Padova, Italy.
  5. S. Ayasun, C. Dafis, C. Nwankpa, and H. Kwatny, “Symbolic Analysis and Simulation for Power System Dynamic Performance Assessment,” IEEE Power Engineering Society General Meeting, pp. 2920-2928, June 12-16, 2005, San Francisco, CA, USA.
  6. U. Eminoglu, S. Ayasun, and T. Yalcinöz, “Application of SVC on Dynamic Load for Different Load Types,” Proc. of International Universities Power Engineering Conference (UPEC 2004), pp. 251-255, 6-8 September 2004, University of the West of England (UWE), Bristol, UK.
  7. S. Ayasun, A. Midilli, and A. Bilgil, “Electricity Production from Drinking Water Lines By Using Turbine-Generator Coupling,” Proc. of the First Cappadocia International Mechanical Engineering Symposium (CMES04), pp.178-184, 14-16 July 2004, Cappadocia, Turkey.
  8.  U. Eminoglu, M. Hakan Hocaoglu, and S. Ayasun, “Dynamic Performance Analysis of SVC on Stair-Case Dynamic Load,” Proc. of International Agegean Conference on Electrical Machines and Power Electronics, pp. 209-213, 26-28 May 2004, Istanbul, Turkey.
  9. S. Ayasun, S. Vallieu, R. Fischl, and T. Chmielewski, “Electric Machinery Diagnostic/Testing System and Power Hardware-in-the-Loop Studies,” Proc. of IEEE Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED 2003), Atlanta, GA, USA, August 24-26, 2003.
  10. S. Ayasun, R. Fischl, S. Vallieu, T. Chmielewski, K. Miu, and C. O. Nwankpa, “Evaluation of the Static Performance of a Simulation-Stimulation Interface for Power Hardware in the Loop,” Proc. of the IEEE Bologna PowerTech 03 Conference, pp. 463-470,June 23-26, 2003, Bologna, Italy.
  11. S. Ayasun, R. Fischl, and S. Vallieu, “Simulation-Stimulation Interface for Power Hardware in-the-Loop Studies,” Proc. of the  MedPower 2002 Conference, Nov. 4-6, 2002, Athens, Greece.
  12. S. Ayasun, A. Monti, R. Dougal, R. Fischl, and S. Vallieu, “On the Stability of Hardware in the Loop Simulation,” Proc. of the 7th International Conference on Modeling and Simulation of Electric Machines, Converters and Systems (ELECTRIMACS 2002),pp. 185-191, Montreal (Quebec), Canada, August 18- 21, 2002.
  13. S. Ayasun, C. O. Nwankpa, and Harry G. Kwatny, “A Novel Method to Compute Singular Points of Differential-Algebraic Power System Model,” Proc. of the 2001 American Control Conference (ACC 2001), Vol. 5 pp. 3563-3564, Arlington, VA, June 25-27, 2001.
  14. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Parameter Space Depiction of the Stability Limits in the Presence of Singularities,” Proc. of the 2001 IEEE International Symposium on Circuits and Systems (ISCAS2001), pp. III/125-III/128, Sydney, Australia Sydney, Australia, May 2001.
  15. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “On the Identification of the Singularity Induced Bifurcations of the Differential-Algebraic Power System Models,” Proc. of the 32nd North American Power Symposium (NAPS 2000), pp. 10/28 –10/34, University of Waterloo, Waterloo, Ontario, Canada, Oct. 2000.
  16. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Singular Points of the Differential-Algebraic Power System Model,” Proc. of IEEE PES 2000 Summer Meeting, Vol. 2, pp. 1951-1956, Seattle, Washington, July 2000.
  17. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Enhanced Visualization of Power System Stability Limits Imposed by Singularity Induced Bifurcations,” Proc. of the 2000 IEEE International Symposium on Circuit and System (ISCAS 2000), pp. IV/229-IV/231, Geneva, Switzerland, May 28-31, 2000.
  18. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Evaluation of Stability Limits Imposed by Singularity Induced and Saddle Node Bifurcations,” Proc. of the 1999 IEEE Conference on Decision and Control (CDC 1999), pp. 682-683, Phoenix, Arizona, December 1999.
  19. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Bifurcation and Singularity Analysis with Voltage Stability Toolbox”, Proc. of the 31st North American Power Symposium (NAPS 1999), pp. 390-397, San Obispo, CA, October 1999.
  20. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Identification of the Functional Relationship between Singularity Induced Bifurcation Points and Load Change”, Proc. of IEEE PES 1999 Summer Meeting, Edmonton, pp. 1318-1323, Alberta, Canada, July 1999.
  21. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Singular Sets and Surfaces and Their Implications in Power Systems,” Proc. of the 1999 American Control Conference (ACC 1999), pp. 4198-4202, San Diego, CA, June 1999.
  22. S. Ayasun, C. O. Nwankpa and Harry G. Kwatny, “Numerical Issues in the Location of Singularity-Induced Bifurcation Points”, Proc. of IEEE PES 1999 Winter Meeting, pp. 707-712, New York City, February 1999.
  23. D. Niebur, S. Ayasun, C. O. Nwankpa, H. G. Kwatny and R. Fischl, “Voltage Stability Modeling and Simulation Using Matlab,” Proc. of the 1998 ONR-Drexel-NSWC Workshop on Electric Shipboard System Modeling, Simulation and Control, Philadelphia, PA June 1998.
  24. S. Ayasun and R. Fischl, “On the Region-Wise Analysis of Available Transfer Capability”, Proc. of the 29th North American Power Symposium (NAPS 1997), pp. 464-470, University of Wyoming, Laramie, Wyoming, November 1997.
  25.  S. Ayasun and R. Fischl, “Investigation of Inter-Area Available Transfer Capability (ATC) with respect to Network Changes”, Proc. of the 1997 International Conference on Power Industry Computer Applications (PICA 1997), Columbus, Ohio, May 1997.

Papers presented in national conferences and published in their proceedings in Turkish

 
  1. S. Ayasun ve D. Çadirli , "Zaman Gecikmeli Hibrid Benzetim-UyartimArayüzünün DC Motor Kontrolüne Uygulanmasi ve Kararlilik Analizi ," 12. Elektrik Elektronik Bilgisayar Biyomedikal Mühendisligi Ulusal Kongresi ve Fuari, 14-18 Aralik 2007, Eskisehir.
  2. A. Gelen ve S. Ayasun, " Zaman Gecikmeli Jeneratör Uyartim Sisteminin Kararlilik Analizi," 12. Elektrik Elektronik Bilgisayar Biyomedikal Mühendisligi Ulusal Kongresi ve Fuari, 14-18 Aralik 2007, Eskisehir.
  3. D. Çadirli ve S. Ayasun, "Zaman Gecikmeli Analog Benzetim-Uyartim Arayüzünün DC Motor Kontrolüne Uygulanmasi ve Kararlilik Analizi," Elektrik-Elektronik-Bilgisayar Mühendisligi Sempozyumu (ELECO 2006), pp. 230-234, 06-10 Aralik 2006, Bursa.
  4. A. Kara, T. Yalçinöz ve S. Ayasun, “Reaktif güç kompanzasyonunun Gerilim Regülasyonuna Etkisinin Deneysel Olarak ve Matlab Ortaminda Gerçeklestirilmesi,” II. Mühendislik Bilimleri Genç Arastirmacilar Kongresi, MBGAK 2005,Istanbul, 17-19 Kasim 2005 (ISBN: 975-404-758-8).
  5. D. Çadirli ve S. Ayasun, “Benzetim-Uyartim Arayüzünün Ayrik Zamanda Kararlilik Analizi,” Elektrik-Elektronik-Bilgisayar Mühendisligi 11. Ulusal Kongre, pp. 125-128, 22-25 Eylül, 2005, Istanbul.
  6. A. Kara, Y. Ceylan, S. Ayasun, T. Yalçinöz, “Bir Tekstil Fabrikasinin Harmonik Analizi,” Elektrik-Elektronik-Bilgisayar Mühendisligi 11. Ulusal Kongre, pp. 288-291, 22-25 Eylül, 2005, Istanbul.
  7. S. Ayasun, “Elektrik Cihazlarinin Testi Için Benzetim-Uyartim (Simulation-Stimulation) Arayüzü ve Bunun Kararlilik Analizi,” Elektrik-Elektronik-Bilgisayar Mühendisligi Sempozyumu (ELECO’2004), 8-12 Aralik 2004, Bursa.

Master and Ph.D. Thesis

  1. S. Ayasun, "Investigation of Inter-Area Available Transfer Capability (ATC) with respect to Network and Load Changes", Master Thesis, Drexel University (USA), December 1997 (Advisor: Dr. Robert Fischl)
  2. S. Ayasun, "Singularity Analysis of Differential-Algebraic Power System Models", Ph.D. Thesis, Drexel University (USA), December 2001 (Advisor: Dr. Chika O. Nwankpa)