Use of generalised additive models to categorise continuous variables in clinical prediction

13 P.

Sliding mode control law for a variable speedwind turbine

Modern wind turbines are designed in order to work in variable speed operations. To perform this task, wind turbines are provided with adjustable speed generators, like the double feed induction generator. One of the main advantage of adjustable speed generators is improving the system efficiency compared to fixed speed generators, because turbine speed can be adjusted as a function of wind speed in order to maximize the output power. However this system requires a suitable speed controller in order to track the optimal reference speed of the wind turbine. In this work, a sliding mode control for variable speed wind turbines is proposed. An integral sliding surface is used, because the integral term avoids the use of the acceleration signal, which reduces the high frequency components in the sliding variable. The proposed design also uses the vector oriented control theory in order to simplify the generator dynamical equations. The stability analysis of the proposed controller has been carried out under wind variations and parameter uncertainties by using the Lyapunov stability theory. Finally simulated results show, on the one hand that the proposed controller provides a high-performance dynamic behavior, and on the other hand that this scheme is robust with respect to parameter uncertainties and wind speed variations, that usually appear in real systems.

Desarrollo de métodos de detección de salmonella basados en la reacción en cadena de la polimerasa y su validación en muestras alimentarias

224 p.

Epistemología de la ordenación del territorio. Enfoque geopolítico

616 p.

Mecanismos fisiológicos de respuesta de la cebada al impacto de la sequía y el elevado CO2 : adaptación al cambio climático

251 p. : il., col.

Los santuarios del territorio en las ciuitates de la Asturia augustana: el ejemplo del deus Vagus Donnaegus

Monografía del ICCA

Las residencias señoriales bajomedievales en el País Vasco: análisis de la evolución del sistema constructivo y sus elementos singulares

8 pag.