Abstract
In this paper, a hybrid approach based on robust control and radial basis function network has been proposed to adjust the output power and generator speed of a variable speed wind turbine. The system is composed of four characteristics: aerodynamics, turbine mechanism, generator dynamics, and actuator dynamics. Such a system has high nonlinearity essence and involves high dynamic mutation. To guarantee the robust stability of internal dynamics, the linearized model of wind turbine has been derived around its operating points. Afterward, H2/H∞ state feedback law has been determined by solving some linear matrix inequalities. Moreover, to keep the system close to its working conditions, a nonlinear compensator has been designed. For instant estimation of the nonlinearity of wind turbines, RBF has been used through an online learning procedure. The performance of the proposed algorithm has been assessed because of internal stability, tracking performance, and eliminating the system’s nonlinearities in the presence of wind with fixed and variable speed.
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Abbreviations
- η:
-
Learning rate of RBF
- λ 1,2,3,4 > 0:
-
Designing parameters of the control signals
- γ :
-
Upper bound of infinity-norm of closed-loop transfer function between the uncertainty and measured output
- υ :
-
Upper bound of 2-norm of closed-loop transfer function between the uncertainty and measured output
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Ranjineh Khojasteh, A., Toshani, H. Design nonlinear feedback strategy using H2/H∞ control and neural network based estimator for variable speed wind turbine. Int. J. Dynam. Control 10, 447–461 (2022). https://doi.org/10.1007/s40435-021-00813-4
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DOI: https://doi.org/10.1007/s40435-021-00813-4