@article {178,
	title = {Multiple-input-multiple-output high-order sliding mode control for a permanent magnet synchronous generator wind-based system with grid support capabilities},
	journal = {IET Renewable Power Generation},
	volume = {9},
	year = {2015},
	pages = {925-934},
	abstract = {This study presents a control design for a grid connected wind energy conversion system based on a gearless PMSG. The generation system structure comprises a three blade turbine, a 2 MW multi-pole PMSG and a full-scale back-to-back frequency converter linked to the utility grid. The proposed control scheme allows following dynamical specifications taking into account operational requirements and ancillary services imposed by the recent grid connection codes, that is, reactive power regulation and fault ride-through (FRT) capabilities. The control actions to be applied during normal grid operation are designed through second-order sliding mode techniques using a two-stage cascade structure. The multi-variable controller designed attains to regulate the active and reactive powers delivered to the grid, minimising the resistive losses into the generator and maintaining important internal variables into the desired range. This controller presents attractive advantages such as robustness against unmodelled dynamics and external perturbations, finite time convergence to the sliding surfaces and chattering mitigation. To endorse the controlled system with FRT capabilities, a switching control scheme based on voltage grid measurements is also proposed. The performance of the whole control approach is analysed through representative simulations which include parameter variations, external perturbations and three-phase voltage dips.},
	keywords = {active power regulation, blade turbine, blades, chattering mitigation, control system synthesis, external perturbation, fault ride-through capability, frequency convertors, FRT capability, full-scale back-to-back frequency converter, gearless permanent magnet synchronous generator, grid connected wind energy conversion system, grid support capability, machine control, MIMO systems, multiple-input-multiple-output high-order sliding mode control design, multipole PMSG, multivariable control systems, multivariable controller design, permanent magnet generators, permanent magnet synchronous generator wind-based system, power convertors, power generation control, power generation faults, power grids, power system measurement, reactive power control, reactive power regulation, resistive loss minimization, second-order sliding mode technique, switching control scheme, synchronous generators, variable structure systems, voltage control, voltage measurement, wind power plants, wind turbines},
	issn = {1752-1416},
	doi = {10.1049/iet-rpg.2014.0417},
	author = {Valenciaga, Fernando and Fern{\'a}ndez, Roberto. D.}
}
@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.}
}
@article {123,
	title = {Control of a Supercapacitor Energy Storage System for Microgrid Applications},
	journal = {Energy Conversion, IEEE Transactions on},
	volume = {28},
	year = {2013},
	month = {Sept},
	pages = {690-697},
	abstract = {<p>The proper operation of a microgrid requires storage devices that increase the inertia and avoid instability of the system. This paper presents the control of an energy storage system (ESS) based on supercapacitor in the context of grid-connected microgrids. The ESS is composed of AC/DC and DC/DC converters tied by a dc link. A single sliding mode strategy is proposed to control a bidirectional dc/dc converter, capable of working properly under all operating conditions. The switching devices are commanded by a single sliding function, dynamically shaped by references sent from the microgrid central controller. This feature facilitates the implementation and design of the control law and simplifies the stability analysis over the entire operating range. The effectiveness of the proposed control strategy is illustrated by experimental results.</p>
},
	keywords = {AC-DC converter, AC-DC power convertors, bidirectional DC-DC converter control, DC-DC power convertors, distributed power generation, Energy storage systems (ESS), ESS, experimental setup, grid connected microgrid application, microgrid central controller, microgrids, Nonlinear control, Power electronics, power generation control, power grids, power system interconnection, sliding function, Sliding mode control, sliding mode strategy, stability, stability analysis, supercapacitor energy storage system control, supercapacitors, switching convertors, switching device, variable structure systems},
	issn = {0885-8969},
	doi = {10.1109/TEC.2013.2260752},
	author = {Inthamoussou, Fernando A. and Pegueroles-Queralt, Jordi and Bianchi, Fernando D.}
}
