@article {321,
	title = {Robust exact differentiators with predefined convergence time},
	journal = {Automatica},
	volume = {134},
	year = {2021},
	pages = {109858},
	abstract = {<p>The problem of exactly differentiating a signal with bounded second derivative is considered. A class of differentiators is proposed, which converge to the derivative of such a signal within a fixed, i.e., a finite and uniformly bounded convergence time. A tuning procedure is derived that allows to assign an arbitrary, predefined upper bound for this convergence time. It is furthermore shown that this bound can be made arbitrarily tight by appropriate tuning. The usefulness of the procedure is demonstrated by applying it to the well-known uniform robust exact differentiator, which is included in the considered class of differentiators as a special case.</p>
},
	keywords = {Disturbance rejection, Finite-time convergence, Fixed-time convergence, Sliding modes, super-twisting algorithm},
	issn = {0005-1098},
	doi = {https://doi.org/10.1016/j.automatica.2021.109858},
	url = {https://www.sciencedirect.com/science/article/pii/S0005109821003782},
	author = {Seeber, Richard and Haimovich, Hernan and Horn, Martin and Fridman, Leonid M. and De Battista, Hern{\'a}n}
}
@article {85,
	title = {Active and Reactive Power Control for Wind Turbine Based on a MIMO 2-Sliding Mode Algorithm With Variable Gains},
	journal = {Energy Conversion, IEEE Transactions on},
	volume = {28},
	year = {2013},
	month = {Sept},
	pages = {682-689},
	abstract = {<p>This study proposes a power control strategy for a grid-connected variable-speed wind turbine, based on a doubly-fed induction generator (DFIG) with slip power recovery. The control objectives vary with the zones of operation (dependant on the wind speed), aiming to maximize the active power in the partial load zone and to limit it when operating within the full load zone, while regulating the stator reactive power following grid requirements. The control design, based on the second-order sliding modes (SOSM) and Lyapunov, uses a modified version of the super-twisting algorithm with variable gains which can be applied to nonlinear multiple inputs-multiple outputs (MIMO) systems. The well-known robustness of the sliding techniques, the simplicity of the algorithm, and the adaptive characteristic of its gains are used together in this study to obtain a controller able to deal robustly with the exacting challenges presented by these systems. An additional benefit of the proposal lies in the smoothness of the control action, an important issue regarding applied mechanical efforts. Representative results obtained by simulation of the controlled system are shown and discussed.</p>
},
	keywords = {asynchronous generators, control design, DFIG, doubly-fed induction generator, energy conversion, full load zone, Gain, Lyapunov method, Mathematical model, MIMO, MIMO 2-sliding mode algorithm, MIMO communication, nonlinear multiple inputs-multiple outputs system, partial load zone, Power control, power generation control, power grid-connected variable-speed wind turbine, power grids, reactive power control, Rotors, second-order sliding modes, second-order sliding modes (SM), slip power recovery, SOSM, stator reactive power control strategy, Stators, super-twisting algorithm, variable gains, variable structure systems, Wind power generation, Wind speed, wind turbines},
	issn = {0885-8969},
	doi = {10.1109/TEC.2013.2272244},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6582571},
	author = {Evangelista, Carolina A. and Valenciaga, Fernando and Puleston, Pablo F.}
}
