Abstract:
The brushless doubly-fed induction machine
continues to attract increasing interest for applications in
wind power generation systems and variable speed motor
drives where, robustness and low servicing costs are much
desirable. This paper presents an H-infinity control of a
grid connected variable speed wind energy conversion
system based brushless doubly-fed induction machine. For
this purpose, a linearized small signals mathematical model
has been developed, and the mixed sensitivity control theory
has been used. To enhance the performances of the mixed
sensitivity design, decoupling and integral actions have
been considered. Additionally, the effect of electrical
parameters uncertainties and operating speed change on
the stability of the brushless doubly-fed induction machine
has been given. The proposed control scheme has been
investigated through simulation implementation under
different modes of operation, sub-synchronous, synchronous
and super-synchronous mode. The obtained results show
that the controller provides satisfying performances when
the operating point varies.
