N. Chilakapati et al., Performance evaluation of doubly-fed twin stator induction machine drive with voltage and current space vector control schemes, IEE P-EL PO, 148(3), 2001, pp. 287-292
The doubly-fed twin stator induction machine (DFTSIM) is of interest as an
adjustable speed drive (ASD) and a variable speed generator (VSG), as it co
mbines the advantages of a brushless drive with the potential for high-volt
age, high-power, and limited speed range applications, Previous work on the
DFTSIM (or its equivalent brushless doubly-fed machine) has considered ste
ady state performance with open loop control or dynamic performance with cl
osed loop control, but has not considered an overall performance evaluation
with an appropriate closed loop speed control. The comparative dynamic and
steady state performance of a laboratory DFTSIM drive using 'voltage space
vector control' and 'current space vector control' schemes is discussed. W
hile the magnitude of the control winding voltage (or current) space vector
is dynamically controlled to obtain the desired torque in a speed control
loop, its position is regulated to operate the machine in synchronous mode.
Results show that tile maximum efficiency for the voltage space vector con
trol is slightly higher than that for the current space vector control sche
me, but the current space vector control offers better dynamic response and
minimum converter voltampere requirement. Although the reduction in the co
nverter VA rating with the DFTSIM drive is similar to that achievable with
a slip power recovery drive, the brushless DFTSIM drive has a greater poten
tial for applications requiring high reliability and low maintenance. Furth
er, the DFTSIM is a viable alternative in the context of non-conventional p
ower generation such as wind and small hydro.