Article metrics

  • citations in SCindeks: 0
  • citations in CrossRef:0
  • citations in Google Scholar:[=>]
  • visits in previous 30 days:3
  • full-text downloads in 30 days:2
article: 2 from 13  
Back back to result list
2017, vol. 72, iss. 3, pp. 392-400
article language: Serbian
document type: Professional Paper
published on: 22/06/2017
doi: 10.5937/tehnika1703392K
Creative Commons License 4.0
Analysis of the accuracy of methods for the determination of the synchronous reactances and the characteristics of turbogenerator
University of Belgrade, Electrical Engineering Institute 'Nikola Tesla'


The values of saturated synchronous reactances turbogenerator for d-axis and q axis are different, Xd,sat > Xq,sat and when their unsaturated equal value, Xd,u = Xq,u. The exact calculation these reactances is quite complex and is conducted only using the finite element method (FEM) with experimental validation. In order to adapt to practical needs, the most important results are elaborated in the form of family magnetizing curves loaded machines for d and q axis. This enables more accurate calculation of saturated synchronous reactance, and on the basis of the excited current and the power angle, and accurate design of the capability diagram for overexcited regimes and underexcited regimes. Such a method of constructing the two families of curves is complex for practical application, however, uses a simpler procedure. The calculation results with the above simplifications are analyzed in the work so that the calculated values of power are compared with the given (measured) values. It turns out that these differences are large, even, in the examples from famous literature, and be critical to use methods that are implemented and in computer programs.


turbogenerator; excited current; power angle; synchronous reactance; magnetizing curves; reactive power


*** (2010) DigSILENT Technical documentation synchronous generator. Germany: DigSILENT Gmbh,
*** (2003) IEEE Std. 1110-2002: IEEE Guide for synchronous generator modeling practices and appl. in power system stability analyses
Arjona, L.M.A., Macdonald, D.C. (1999) A new lumped steady-state synchronous machine model derived from finite element analysis. IEEE Transactions on Energy Conversion, 14(1): 1-7
Boldea, I. (2006) Synchronous generators: The electric generator handbook. New York: Taylor & Francis, pp. 512, 2006
Chari, M.V.K., Minnich, S.H., Csendes, Z.J., Berkery, J., Tandon, S. (1981) Load Characteristics of Synchronous Generators by the Finite-Element Method. IEEE Transactions on Power Apparatus and Systems, PAS-100(1): 1-13
El-Serafi, A.M., Abdallah, T.A., El-Sherbiny, M.K., Badawy, E.H. (1988) Experimental Study of the Cross-magnetizing Phenomenon in Saturated Synchronous Machines. IEEE Transaction on En. Conv, Vol. 3, No. 4, pp. 815-823, Dec
Kostić, M. (2014) Metod za indirektno određivanje parametara turbogeneratora u radnim uslovima. Zbornik radova, Elektrotehnički institut 'Nikola Tesla', br. 24, str. 177-191
Kostić, M.M. (2016) Prijava patenta P 2016/0940 od 02. 11. Postupak za određivanje ekvivalentne reaktanse rasipanja i sinhrone reaktanse u režimima potpobude generatora
Kundur, P. (2000) Power system stability and control. McGraw-Hill, pp. 1167
Lopez, M. A. A., Macdonald, D. C. (2002) Analysis of Synchronous Reactances as a Function of Airgap MMF. Electric Power Components and Systems, 30(4): 345-359
MacDonald, D.C., Reece, A.B.J., Turner, P.J. (1985) Turbine-generator steady-state reactances. IEE Proceedings C Generation, Transmission and Distribution, 132(3): 101
Munich, S.H., Schulz, R.P., Baker, D.H., Sharma, D.K., Fish, J. (1987) Saturation Function for Synchronous Generator from Finite Elements. IEEE Tran on En. Con, No. 4, pp. 680-92
Namba, M., Hosoda, J., Doi, S., Udo, M. (1981) Development for Measurement of Operating Parameters of Synchronous Generator and Control Systems. IEEE Transactions on Power Apparatus and Systems, PAS-100(2): 618-628
Yoshihide, H. (2007) Handbook of Power System Engin. John Wiley & Sons, pp. 504