High-Order Sliding Mode Control of DFIG-Based Wind Turbines - Wind Turbine Control and Monitoring - page 40

Time (sec)

Fig. 2.11 Wind speed profile

Time (sec)

Fig. 2.12 Current I rd tracking performance: Reference (blue) and real (green)

Fig. 2.13 Torque tracking
performance: Reference
(blue) and real (green)

Time (sec)

2.4.3 HOSM Control Performances with High-Gain
Observer

The observer validation is clearly illustrated by Fig. 2.14 .
Indeed, the aerodynamic torque tracks efficiently the optimal torque. As shown
in Figs. 2.15 and 2.16 , very good tracking performances are achieved in terms of
DFIG rotor current and WT torque with respect to wind fluctuations. The control
strategy does not induce increased mechanical stress as again there are no strong
torque variations.