B. Hopfensperger et al., Combined magnetising flux oriented control of the cascaded doubly-fed induction machine, IEE P-EL PO, 148(4), 2001, pp. 354-362
A cascaded doubly-fed induction machine (CDFM) is a connection of two wound
rotor induction machines. In comparison to a single doubly-fed (wound roto
r) induction machine (SDFM) brushes are obsolete. Because of recent develop
ments in brushless doubly-fed machine design, there is a renewed interest i
n associated control. The paper presents theoretical and experimental studi
es of a combined magnetising flux oriented control method for a CDFM. After
the existing control method has been described it is then modified to be a
pplicable to any CDFM machine combination. In a second step the control met
hod is simplified and the performance is explored. Investigations of a powe
r control loop for the simplified control show that this control method doe
s not lead to natural decoupled active and reactive power control as known
from the SDFM.