@article {92,
	title = {A simple robust controller for power maximization of a variable-speed wind turbine},
	journal = {International Journal of Energy Research},
	volume = {34},
	year = {2010},
	pages = {924{\textendash}932},
	abstract = {<p>This paper presents a high-order sliding mode control strategy that aims to optimize the power conversion efficiency of a wind energy conversion system within the partial load zone of operation. The main challenges of this control problem are related to the random variations of the wind speed, the nonlinear nature of the whole system, usual model uncertainties and external disturbances. For all these reasons, the robustness, simplicity and low computational burden of the proposed super-twisting algorithm result very attractive in this context. Simulation results that show the achievement of the desired characteristics are provided. Copyright {\^A}{\textcopyright} 2009 John Wiley \&amp; Sons, Ltd.</p>
},
	keywords = {efficiency optimization, Robust control, Sliding mode, Wind energy},
	issn = {1099-114X},
	doi = {10.1002/er.1613},
	url = {http://dx.doi.org/10.1002/er.1613},
	author = {Evangelista, Carolina A. and Puleston, Pablo F. and Valenciaga, Fernando}
}
@article {98,
	title = {A geometric approach for the design of MIMO sliding controllers. Application to a wind-driven doubly fed induction generator},
	journal = {International Journal of Robust and Nonlinear Control},
	volume = {19},
	year = {2009},
	pages = {22{\textendash}39},
	abstract = {<p>This paper presents a systematic methodology to design controllers for a general class of nonlinear MIMO systems affine in the control in the presence of bounded uncertainties and disturbances. The design method is developed using a theoretical framework based on the combination of a geometric approach and sliding mode techniques. The resulting robust control law guarantees finite time convergence, whereas chattering reduction is achieved by utilizing the minimum discontinuous action required to ensure disturbance rejection. The proposed methodology is applied to the control of a grid-connected wind energy generation system based on a doubly fed induction generator. The control objectives considered in this paper are maximization of the wind energy conversion and reactive power regulation to minimize machine losses. Copyright {\^A}{\textcopyright} 2008 John Wiley \&amp; Sons, Ltd.</p>
},
	keywords = {efficiency optimization, Sliding mode control, Wind energy},
	issn = {1099-1239},
	doi = {10.1002/rnc.1323},
	url = {http://dx.doi.org/10.1002/rnc.1323},
	author = {Valenciaga, Fernando and Puleston, Pablo F. and Spurgeon, Sarah}
}
