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Doubly Fed Induction Generator Systems for Wind Turbines.pdf
B Y S . M Ü L L E R ,
M . D E I C K E ,
R I K W .
D E D O N C K E R
A viable alternative to ADJUST SPEED over a wide range at MINIMAL COST
S
A HE AIM OF WIND TURBINE SYS-
I
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G TEMS DEVELOPMENT is to contin-
R
O
E. uously increase output power. A few
E T
E
I. years ago, the rated output power of
W
W production-type units reached 200 kW. By 1999,
W
• the average output power of new installations
2
0 climbed to 600 kW. The largest series production
0
2
E units today are specified to deliver 1.5-MW output
N
U
J
| power (Table 1). It is anticipated that in the near fu-
Y
A
M ture, power rating of wind turbines will increase fur-
• ther, especially in offshore applications. For
E
N
I example, the prototype of a Nordex N80 with a rated
Z
A
G power of 2.5 MW was installed in March 2000 near
A
M
Aachen.
S
N
O Many low-power wind turbines built to-date were
I
T
A
C constructed according to the “Danish concept” (Fig. 1),
I
L
P in which wind energy is transformed into electrical en-
P
A
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