Abstract. Magnetorheological (MR)

Abstract.The paper presents a model-based fault detection method for pitch actuators faults using the normalized gradient method to estimate the parameters of the pitch actuator. One major difficulty is that the input signal to the parametric estimation method must be a persistent excitation. To circumvent this, a chattering term is added to the pitch control law and the usual low-pass filters are not used for the parametrization in the normalized gradient method (thus acceleration information is used). In order to verify the proposed method, simulations are conducted within a Hardware in the Loop (HiL) platform using the wind turbine simulation software FAST (Fatigue, Aerodynamics, Structures, and Turbulence).

Centralized model predictive controllers are common in water systems. The control action variable can be the discharge, and the subsystems (canal pools) are modeled separately. This paper focuses on short canal pools where the interactions are stronger between canal pools. Could this procedure be better if gate openings were used as control action variables and the interconnected system were modeled for the controller? Model predictive controllers (MPCs) were developed using the discharge and the gate opening as control action variable and tested experimentally using the laboratory canal of the Technical University of Catalonia. It was found that for centralized MPCs for short canal pools, the use of gate opening as control action variable is more beneficial than discharge. Another additional advantage is that in this way it is possible to put constraints on the gate opening and the change of gate opening, which are important to the limitations of the physical system.

Abstract. The main contribution of this paper is to propose new control techniques which not only provide fault tolerance capabilities to the WT system, but also improve the overall performance of the system in both fault free and faulty conditions. Coupled nonlinear aero-hydro-servo-elastic simulations of an offshore wind turbine with jacket platform are carried out. The proposed controllers are based in the super-twisting algorithm (STA) by using feedback of the generator shaft speed as well as the fore-aft and side-to-side acceleration signals of the WT tower.

Resumen: Se presenta el estudio hidráulico para poder aislar, en el menor tiempo posible y sin desbordamientos, la red de canales del Canal de la Margen Izquierda del Delta del río Ebro. Ello se consigue mediante el cierre cuasi instantáneo del Canal de Conducción -fuente de alimentación de todo el sistema-en caso de una emergencia, como por ejemplo, la llegada de un vertido de contaminantes por el río Ebro. La operación de cierre de 7,3 horas de duración total consta de tres fases. La Fase 1 de 3 horas pone el canal en un estado de transporte de 15 m 3 /s -de los 19 m 3 /s máximos de la concesión-de manera que se consigue un resguardo suficiente para la ejecución de las fases siguientes. La Fase 2, también de 3 horas de duración, pone el canal en un estado de transporte de 2 m 3 /s a partir del estado final de la Fase 1 de 15 m 3 /s. Este cambio de estado del canal tan brusco se consigue con la aplicación sobre el canal de las "trayectorias de compuerta" calculadas en el contexto de un sistema de control centralizado en lazo abierto mediante el algoritmo "GoRoSo". Finalmente, en la Fase 3, de duración mínima de 1,3 horas, se produce el cierre absoluto del Canal de Conducción. El objetivo es mantener el canal cerrado y lleno, lo que evitaría la entrada de agua contaminada desde el exterior.