C. Bruzzese and E. Santini (Italy)
Doubly fed induction machine, vector control.
In this paper some general aspects of primary importance
about the steady state and transients of the doubly-fed
wound rotor induction machine (DFIM) will be shown, as
the limited dependence of stator flux on the impressed
rotor currents, the strong dependence of inherent machine
stability on the direct component of impressed rotor
currents, the possibility to define a "reactive torque" that
turns out in the reactive power analytical expression, in
analogy with the active torque (the electromagnetic
torque), and by which a deeper machine knowledge and
easier control can be reached.
A simple graphical method is explained that allows to
obtain the complete steady-state vector diagram of the
machine. Some simulations are carried out in order to
verify the machine behaviour.