Control Strategy to Maximize Power Extraction in Wind Turbine
DOI:
https://doi.org/10.13052/dgaej2156-3306.3142Keywords:
Variable speed Wind turbine, Integral sliding mode controller, Modified Newton Raphson, ATF and ISCAbstract
This article deals with nonlinear control of variable speed wind
turbine (VSWT), where the dynamics of the wind turbine (WT) is
obtained from a single mass model. The main objective of this work
is to maximize the energy capture form the wind with reduced oscillation on the drive train. The generator torque is considered as the
control input to the WT. In general the conventional control techniques
such as Aerodynamic Torque Feed-Forward (ATF) and Indirect Speed
Control (ISC) are unable to track the dynamic aspect of the WT. To
overcome the above drawbacks the nonlinear controllers such Sliding
Mode Controller (SMC) and SMC with integral action (ISMC) with
the estimation of effective wind speed are proposed. The Modified
Newton Raphson (MNR) is used to estimate the effective wind speed
from aero dynamic torque and rotor speed. The proposed controller is
tested with different wind profiles with the presence of disturbances
and model uncertainty. From the results the proposed controller was
found to be suitable in maintaining a trade-off between the maximum
energy capture and reduced transient on the drive train. Finally both
the controllers are validated by using FAST (Fatigue, Aerodynamics,
Structures, and Turbulence) WT simulator.
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