Identification of Coherent Generators Using Fuzzy C-Means ...

coherency measures and the clustering of generator groups at different prescribed numberof coherent groups can be obtained. Also a new proposed algorithm of constructing thedynamic equivalent of power system is presented in this work. The calculations of theparameters of the new transmission lines are also presented. The effect of systemparameters, modeling and loading conditions are also studied. It is found that the changingof machines inertia constants and machines modeling have a small effect on the coherentgenerators, while The machines damping coefficients, transient reactance’s and loadingconditions have a large effect on the coherent generators.The obtained results show that the coherent groups of generators are dependent on the typeand the location of disturbance. The proposed method is highly effective in determining thecoherent groups of generators and in constructing the dynamic equivalent of power system.7. References[1] R. JAMES, W. JANUSZ and JARR MACH.: “Power System Dynamics and Stability”, JOHNWILEY and SONS LTD., 1997.[2] PODMORE, R.: 'Identification of Coherent Generators for Dynamic Equivalents', IEEE Trans.,1978, PAS-97, (4), PP. 1344-1354.[3] LEE, S.T.Y., and SCHWEPPE, F.C.: 'Distance Measure and Coherency Recognition for TransientStability equivalents', IEEE Trans., 1973, PAS-92, PP. 1550-1557.[4] KRISHAPARANDHAMA, S. ELANGORAN and K. Kuppurajulu, 'Method for IdentifyingCoherent Generators', Vol. 3, No. 2, PP. 85-90, April 1981.[5] M. Y. HUSSAIN, V.G. RAU. :'Coherency Identification and Construction of Dynamic Equivalentfor Large Power System', IEE 2nd International Conference on Advances in Power System Control.Operation and Management. December 1993. Hong Kong.[6] SPALDING, B.D., YEE, H., and GOUDIE, B.D.: ‘Coherency Recognition for Transient StabilityStudies Using Singular Points’, IEEE Trans., 1977, PAS-96, (4), pp. 1368-1375.[7] MIR MUJAHID ALI, 'Identification of Coherent Generators Using Linear Trajectory', Msc. D.Thesis, University of Ng Fahd of Petroleum and Minerals, Dhahrann, Saudi Arabia, 1993.[8] J. P. YANG, G. H. CHENG, Z. XU. :'Dynamic Reduction of Large Power System in PSS/E',IEEE/PES Transmission and Distribution Conference & Exhibition, 2005: Asia and Pacific Dalian,China.[9] GHAFURIAN. A. and BERG. G. J. Coherency Based Multimachine Study', IEE PROC., Vol.129, Pt. C, (4), July 1982, PP. 153-160.[10] MOHAMED EL-SHIMY, 'Electromechanical System Equivalent and Dynamic LoadAggregation for Transient Stability of Electric Power System', Ph. D. Thesis, University of AinShams, Cairo, 2004.[11] Mahdi M. M. El-Arini, M. M. El Metwally,’Order Reduction in Dynamic Modeling of PowerSystem Control’, Engineering First Intern. Conference, Cairo, Egypt, December 9-12, 1989, Vol. 8,PP. 207-218.[12] ZHAO SHUQIANG, XIANRONG, YANJIANG and RENMU, ‘A Reduced Order Method forSwing Mode Eignvalue Calculating Based on Fuzzy Coherency Recognition’, Power systemTechnology Proceedings 1998. Vol. 2, pp 1402-1405.[13] SHU-CHEN WANG and PEI-HWA HUANG, ’Fuzzy C-Means Clustering for Power SystemCoherency’, IEEE international conference 2005, Vol. 3, pp. 2850-2855.[14] N. Pal, K. Pal, J. Keller, and J. Bezdek, ‘A possibilistic fuzzy c-means clustering algorithm’,IEEE Trans Fuzzy Systems, Vol. 13, No. 4, 2005, pp. 517–530.[15] A. K. BEHERA, 'Transient Stability Analysis of Multimachine Power System Using DetailedMachine Models', Ph. D. Thesis, University of Illinois at Urbana-Champaign, 1988.18