Showing papers by "Tarek Ahmed-Ali published in 2008"
01 Nov 2008
TL;DR: In this paper, a robust nonlinear control strategy, namely high-order sliding mode control, is proposed to increase the generated power and therefore the efficiency of a marine current turbine.
Abstract: This paper deals with the speed control of a variable speed DFIG-based marine current turbine Indeed, to increase the generated power and therefore the efficiency of a marine current turbine, a nonlinear controller has been proposed DFIG has been already considered for similar applications particularly wind turbine systems using mainly PI controllers However, such kinds of controllers do not adequately handle some of tidal resource characteristics such as turbulence and swell effects Indeed, these may decrease marine current turbine performances Moreover, DFIG parameter variations should be accounted for Therefore, a robust nonlinear control strategy, namely high-order sliding mode control, is proposed This control strategy relies on the resource and the marine turbine models that were validated by experimental data The sensitivity of the proposed control strategy is analyzed regarding the swell effect as it is considered as the most disturbing one for the resource model Tidal current data from the Raz de Sein (Brittany, France) are used to run simulations of a 75-kW prototype over various flow regimes Simulation results are presented and fully analyzed
30 citations
01 Sep 2008
TL;DR: In this paper, the authors deal with the modeling and the sensorless control of a variable speed DFIG-based marine current turbine and analyze the sensitivity of the proposed control strategy regarding the swell effect as it is considered as the most disturbing one for the resource model.
Abstract: This paper deals with the modeling and the sensorless control of a variable speed DFIG-based marine current turbine. The proposed MPPT sensorless control strategy relies on the resource and the marine turbine models that were validated by experimental data. The sensitivity of the proposed control strategy is analyzed regarding the swell effect as it is considered as the most disturbing one for the resource model. Tidal current data from the Raz de Sein (Brittany, France) are used to run simulations of a 7.5-kW prototype over various flow regimes. Simulation results are presented and fully analyzed.
20 citations
01 Sep 2008
TL;DR: The proposed MPPT sensorless control strategy relies on the resource and the marine turbine models that were validated by experimental data and the sensitivity of the proposed control strategy is analyzed regarding the swell effect.
Abstract: This paper deals with the modeling and the sensorless control of a variable speed DFIG-based marine current turbine. The proposed MPPT sensorless control strategy relies on the resource and the marine turbine models that were validated by experimental data. The sensitivity of the proposed control strategy is analyzed regarding the swell effect as it is considered as the most disturbing one for the resource model. Tidal current data from the Raz de Sein (Brittany, France) are used to run simulations of a 7.5-kW prototype over various flow regimes. Simulation results are presented and fully analyzed.
3 citations