@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.}
}
@conference {212,
	title = {Low-cost sliding-mode power controller of a stand-alone photovoltaic module},
	booktitle = {2010 IEEE International Conference on Industrial Technology},
	year = {2010},
	month = {March},
	abstract = {This work presents a simple and low-cost power electronic system that allows a flexible control of the operating conditions of the photovoltaic module. The system consists of a buck converter with sliding mode control. Control algorithms for maximum power tracking, module voltage and load current regulation are proposed. Moreover, these algorithms can be readily combined to have a complete control of the energy conversion system. The dynamic analysis reveals that there may be regions of instability that are avoided by appropriate switching logics. Operation and main features of the proposed electronic power controller are validated through simulation and experimental results.},
	keywords = {Buck converters, Control systems, Current control, electric current control, energy conversion, load current regulation, Logic, maximum power point trackers, maximum power tracking, module voltage control, photovoltaic cells, Photovoltaic systems, Power control, power controller, Power electronics, Sliding mode control, Solar power generation, stand-alone photovoltaic module, variable structure systems, voltage control},
	doi = {10.1109/ICIT.2010.5472600},
	author = {Inthamoussou, Fernando A. and De Battista, Hern{\'a}n and Cendoya, Marcelo}
}
@article {70,
	title = {Performance analysis of a variable structure controller for power regulation of WECS operating in the stall region},
	journal = {International Journal of Energy Research},
	volume = {25},
	year = {2001},
	pages = {1345{\textendash}1357},
	abstract = {<p>This paper deals with power regulation in variable speed wind energy conversion systems. The importance of power control in the stall region is stressed. This mode of operation is characterized by a non-minimum phase behaviour. A variable structure controller is described that provides stability by means of speed feedback and is robust to grid disturbances and model uncertainties. Performance of the controller is investigated. A compromise arises in the design of the speed feedback gain between high and low frequency wind components rejection. Furthermore, a cut-off frequency of the wind velocity measurement is obtained that minimizes the effect of turbulence on power regulation. Simulation results are presented, corroborating the features of the control strategy.</p>
},
	keywords = {energy conversion, Power control, variable structure systems, Wind energy},
	issn = {1099-114X},
	doi = {10.1002/er.758},
	url = {http://dx.doi.org/10.1002/er.758},
	author = {De Battista, Hern{\'a}n and Mantz, Ricardo J. and Christiansen, Carlos F.}
}
