1
Vector Controlled Doubly Fed Induction Generator for
Wind Applications
Dr. Ani Gole, Dept. of Electrical and Computer Eng.,
University of Manitoba.
This document discusses the theory of operation behind the doubly fed generator case
developed by Ani Gole (Univ. of Manitoba, Canada) and Om Nayak (Nayak Corporation,
Princeton, NJ). The controller concept is based on the paper by Pena et al [1].
Description of Rotor Current Generation Circuit (Generator PWM Converter and
Controls)
The Doubly fed induction generator/motor allows power output/input into the stator
winding as well as the rotor winding of an induction machine with a wound rotor
winding. Using such a generator it is possible to get a good power factor even when the
machine speed is quite different from synchronous speed. Such machines can therefore
operate without the need for excessive shunt compensation.
The rotor currents (ira,irb,irc) of the machine can be resolved into the well known direct
and quadrature components i
d
and i
q
. The component i
d
produces a flux in the air gap
A
B
C
Isa
Isb
INDUCTION GENERATOR
13.8 kV, 500 HP
Isc
Vb
Vc
CTRL
S
TL
C
A
B
I M
b
c
W
a
& Controls
& Controls
GRID
PWM Converter
PWM Converter
b
a
b
c
a
c
GENERATOR
Va
ira,irb,irc
Fig 1: Doubly Fed Induction Generator
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