| Abstract: |
With the MVA ratings of turbogenerators roughly doubling every ten-1years the various inadequacies present in the existing modelingtechniques are becoming increasingly apparent. The critical and basicmodeling inadequacy lies in representing the effect of instantaneousmagnetic saturation on various machine parameters which in turn influ-ence the power system stability and other dynamical aspects. At thisstage, it is highly desirable to develop a mathematical model for turbo-generators capable of rigorously accounting for this instantaneous mag-netic saturation. Meanwhile, the degree of complexity of such a modelshould not hinder its use for practical engineering applications.Availability of such a model would be paramount to the solutionsof critical aspects of the generator-power system dynamic interaction.First, it is impractical to duplicate the machine operating conditions,which are deemed severe (often dangerous) in a laboratory or a shop-floor type environment and facilities, in order to determine thedynamic behavior of turbogenerators. Such a model could be used tosimulate such operating condition (disturbances) to predict the result-ing consequences (transient currents, transient torques, flux densities,losses, power angle swing, etc.) Also, this model can be extended formulti-machine interaction studies. Secondly, such a model can help amachine designer to optimize certain design variables, subject to someconstraints, which influence the machine dynamic characteristics, duringthe early design stages. Thirdly, it is this author’s belief(2) thatsuch a model, which can include the effect of instantaneous magnetic
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