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Tehnika 2017, vol. 72, iss. 3, pp. 392400



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'
AbstractThe values of saturated synchronous reactances turbogenerator for daxis 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.
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