Abstract
In this chapter, transient response of synchronous machines connected to stiff network is analyzed and discussed. Analysis of transients in electrical and mechanical subsystems of synchronous machines is relatively complex due to a relatively large number of state variables, such as the rotor position and speed, and the winding currents and flux linkages. Complexity of mathematical model does not help the process of understanding the nature of transients and hinders deriving corresponding conclusions. The analysis can be simplified by introducing the assumption that transients in electrical subsystem decay considerably faster than those of mechanical subsystem. In this way, analysis of transients in mechanical subsystem can be performed by using steady state model of electrical subsystem. In this way, results are made more legible and intuitive.
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Notes
- 1.
Sustained oscillations in torque and current increase the rms value of the stator currents, increase the power of copper losses, contribute to mechanical stress and ware of shaft and transmission elements, increase the acoustic noise, and reduce the peak torque and peak power capability of the machine.
- 2.
Excitation windings of large synchronous machines are supplied from adjustable sources of DC voltage. The source voltage is used as the driving force which is used to control the excitation current. At the wake of the short circuit event, the changes in the excitation voltage can be neglected, and it is justifiable to assume that the excitation winding is supplied from the voltage source that provides a constant voltage. Later on, as the transient phenomena decay while the short circuit persists, it is justifiable to assume that the excitation current is constant, namely, that the excitation winding is supplied from a source of constant current.
- 3.
In the considered case, the machine is equipped by damper windings, but the transient processes in these windings have ceased, and the electrical currents in damper windings are equal to zero.
- 4.
The assumption R R I R  ≈ 0 reduces the voltage across the excitation winding to zero, which means that it behaves as a short-circuited winding.
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© 2013 Springer Science+Business Media New York
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Vukosavic, S.N. (2013). Transients in Sychronous Machines. In: Electrical Machines. Power Electronics and Power Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-0400-2_21
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DOI: https://doi.org/10.1007/978-1-4614-0400-2_21
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Publisher Name: Springer, New York, NY
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