Network reduction of power system for transient stability studies


N. Ashwin
J. Sreedevi
Pradip Kumar Dixit


Modern power systems are complicated and heavily interconnected systems. Hence critical analysis of the network for power system planning is very important. Challenges in analyzing large interconnected networks have given rise to the need to find small, equivalent networks in order to improve computational efficiency. There are many methods for determining an equivalent network which accurately represents the original network. In this paper Thevenin’s method is used to calculate the equivalent of a system. The PSS/E software is used to demonstrate the method for separation of a particular area network from all-India network by placing dynamic equivalents at the boundary buses.


How to Cite
Ashwin, N., Sreedevi, J., & Kumar Dixit, P. (2017). Network reduction of power system for transient stability studies. Power Research - A Journal of CPRI, 263–268. Retrieved from


  1. S. M. Ashraf, B. Rathore and S. Chakrabarti, "Performance analysis of static network reduction methods commonly used in power systems," 2014 Eighteenth National Power Systems Conference (NPSC), Guwahati, 2014, pp. 1-6.
  2. S. Djukic and A. Saric, “Dynamic model reduction: An overview of available techniques with application to power systems,” Serbian Journal of Electrical Engineering, Vol. 9, No. 2, pp. 131–169, 2012.
  3. A. Papaemmanouil and G. Andersson, “On the Reduction of Large Power System Models for Power Market Simulations,” [Online]. Available: PSCC2011_Antoni os .pdf.
  4. J. B. Ward, "Equivalent circuits for powerflow studies," in Electrical Engineering, Vol. 68, No. 9, pp. 794-794, Sept. 1949.
  5. A. Monticelli, S. Deckmann, A. Garcia and B. Stott, "Real-Time External Equivalents for Static Security Analysis," in IEEE Transactions on Power Apparatus and Systems, vol. PAS-98, No. 2, pp. 498-508, March 1979.
  6. P. Dimo, Nodal Analysis of Power Systems, Abacus Press, Kent, England, 1975.
  7. W. F. Tinney and W. L. Powell, “The REI Approach to Power Network Equivalents,” IEEE PICA Conference Proceedings, Minneapolis, pp. 384390, July 1983.
  8. E. C. Housos, G. Irisarri, R. M. Porter and A. M. Sasson, “Steady State Network Equivalents for Power System Planning Applications,” IEEE Trans. Power App. Syst., Vol. PAS-99, no. 6, Nov./Dec. 1980.
  9. S. Deckmann, A. Pizzolante, A. Monticelli, B. Stott and O. Alsac, "Studies on Power System Load Flow Equivalencing," in IEEE Transactions on Power Apparatus and Systems, Vol. PAS-99, No. 6, pp. 23012310, Nov. 1980.
  10. W. Richter, "Applications of Thevenin's theorem," in Electrical Engineering, Vol. 64, No. 3, pp. 103-105, March 1945.
  11. J. Sreedevi, K. G. V. S. B. Raju and K. S. Meera, “Computation of Equivalent Network at HVDC Terminals,” National Conference On ZEN and TAO of Electrical And Electronics Engineering, Jan. 2014.

Most read articles by the same author(s)