Environmental Engineering Reference
In-Depth Information
Grid50 Hz
Stator power
DFIG
Rotor side
converter
Gridside
converter
Rotor
power
u
v
v n MPPT
I r
ω
Second-Order
Sliding Mode Controller
r
T em
v 2
v 1
Speed
Turbine
Fig. 2.5
The high-order sliding mode control structure
2.3.3 High-Gain Observer
A high-gain observer can be used to estimate the aerodynamic torque. A key
feature of a high-gain observer is that it will reduce the chattering induced by a
sliding mode observer [ 18 ].
From Eq. ( 2.4 ), we have
x ¼ T a
J K t x
T em
J
ð 2 : 17 Þ
J
The following notations are introduced.
x 1 ¼ x
x 2 ¼ T J
ð 2 : 18 Þ
Thus, we have
x 1 ¼ x 2 J x 1 T e J
x 2 ¼ f ð t Þ
x ¼
ð 2 : 19 Þ
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