@article {80,
	title = {Control of variable-speed wind turbines by LPV gain scheduling},
	journal = {Wind Energy},
	volume = {7},
	year = {2004},
	pages = {1{\textendash}8},
	abstract = {<p>This article considers gain-scheduling control of variable-speed wind energy conversion systems (WECS) in the context of linear parameter-varying (LPV) systems. The typical problems of the classic gain-scheduling techniques, such as stability guarantees, undesirable transient responses in the controller commutations and arduous design procedures, can be avoided with this new formulation. A model of a variable-speed WECS expressed in LPV form and an optimal LPV gain-scheduling control strategy are presented.</p>
},
	keywords = {gain scheduling, linear parameter-varying systems, wind energy conversion systems, wind turbines},
	issn = {1099-1824},
	doi = {10.1002/we.103},
	url = {http://dx.doi.org/10.1002/we.103},
	author = {Bianchi, Fernando D. and Mantz, Ricardo J. and Christiansen, Carlos F.}
}
@article {81,
	title = {Power regulation in pitch-controlled variable-speed WECS above rated wind speed},
	journal = {Renewable Energy},
	volume = {29},
	year = {2004},
	pages = {1911 - 1922},
	abstract = {<p>In medium to large scale wind energy conversion systems (WECS), the control of the pitch angle of the blades is an usual method for power regulation above rated wind speed. However, limitations of the pitch actuator have a marked influence on the regulation performance. In variable-speed mode, the control of the generator torque is able to reduce the effects of the pitch actuator limitations. Nevertheless, in this case the system is multiple-input multiple-output (MIMO) and then the control design results more complex. In this situation advance control techniques, such as optimal control, are an interesting option for a systematic controller design. This work analyzes variable-pitch power regulation above rated wind speed in the context of optimal control. The analysis is approached from a new point of view in order to establish a clear connection between the choice of the optimization criteria and the compromise between power regulation and pitch actuator limitations.</p>
},
	keywords = {wind energy conversion systems},
	issn = {0960-1481},
	doi = {http://dx.doi.org/10.1016/j.renene.2004.02.009},
	url = {http://www.sciencedirect.com/science/article/pii/S0960148104000886},
	author = {Bianchi, Fernando D. and Mantz, Ricardo J. and Christiansen, Carlos F.}
}
