The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
S. Islam - One of the best experts on this subject based on the ideXlab platform.
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Harmonic mitigation in wind turbine energy conversion systems
2006 37th IEEE Power Electronics Specialists Conference, 2006Co-Authors: F. Dos S Reis, S. Islam, F. D. Adegas, R. TonkoskiAbstract:Permanent magnet synchronous generators (PMSG applied to wind energy conversion system (WECS) using Variable speed operation is being used more frequently i wind turbine Application. Variable speed systems have several advantages over the traditional method of operating win turbines, such as the reduction of mechanical stress and a increase in energy capture. To allow the Variable speed operation of the PMSG WECS a conventional three-phase bridge rectifier (BR) with a bulky capacitor associated with voltage source current controlled inverter (VS-CCI) is used This simple scheme introduces a high intensity low frequency current harmonic content into the PMSG and consequently increases the total loses in it. Subsequently, decreases the power capability of the system. This paper presents comparative simulation study between three different approaches applied to harmonic mitigation in PMSG WECS The studied techniques are: a) harmonic trap filters (HTF), b single-switch three-phase boost rectifier (PFC) and c) a three phase boost type PWM rectifier (PWMREC).
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Effect of loss modeling on optimum operation of wind turbine energy conversion systems
2005 International Power Engineering Conference, 2005Co-Authors: S. IslamAbstract:Permanent magnet synchronous generator (PMSG) wind energy converters system (WECS) with Variable speed operation is being used more frequently in the wind turbine Application. Variable speed systems have several advantages over the traditional method of operating wind turbines, such as the reduction of mechanical stress and increase in energy capture. To fully exploit the last mentioned advantage, this paper proposes a simple new sensor-less maximum power point tracking (MPPT) control scheme for PMSG WECS and show the optimum operating points of the PMSG for true maximum output power is not necessarily operating at maximum power coefficient (Cp) value. This is to propose a controller with minimal losses as well as optimum power extraction
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86. Optimum Operation of Wind Turbine Energy Conversion System on Effect of Loss Modelling on the Permanent Magnet Generators
Tunnelling and Underground Space Technology, 2004Co-Authors: S. IslamAbstract:Permanent magnet synchronous generator (PMSG) wind energy converters system (WECS) with Variable speed operation is being used more frequently in the wind turbine Application. Variable speed systems have several advantages over the traditional method of operating wind turbines, such as the reduction of mechanical stress and increase in energy capture. To fully exploit the last mentioned advantage; this paper proposes a simple new sensor-less maximum power point tracking (MPPT) control scheme far PMSG WECS and show the optimum operating points of the PMSG for true maximum output power is not necessarily operating at maximum power coefficient (Cp) value. This is to propose a controller with minimal losses as well as optimum power extraction.
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Using PFC for harmonic mitigation in wind turbine energy conversion systems
30th Annual Conference of IEEE Industrial Electronics Society 2004. IECON 2004, 2004Co-Authors: F.s. Dos Reis, S. IslamAbstract:Permanent magnet synchronous generators (PMSG) wind energy conversion system (WECS) using Variable speed operation is being used more frequently in wind turbine Application. Variable speed systems have several advantages over the traditional method of operating wind turbines, such as the reduction of mechanical stress and an increase in energy capture. To allow the Variable speed operation of the PMSG WECS a conventional three-phase bridge rectifier (BR) with a bulky capacitor associated with voltage source current controlled inverter (VS-CCI) is used. This simple scheme introduces a high intensity low frequency current harmonic content into the PMSG and consequently increases the total loses in it. Subsequently, decreases the power capability of the system. In this paper a simulation study using a single-switch three-phase boost rectifier (PFC) applied to harmonic mitigation in this systems is presented.
Maria Erlinda M. Mutuc - One of the best experts on this subject based on the ideXlab platform.
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Impact Assessment of Bt Corn Adoption in the Philippines
Journal of Agricultural and Applied Economics, 2012Co-Authors: Maria Erlinda M. Mutuc, Roderick M. Rejesus, Jose M. YorobeAbstract:This article examines the impact of Bt corn adoption in the Philippines using an econometric approach that addresses simultaneity, selection, and censoring problems. Although previous literature emphasizes the importance of simultaneity and selection problems, this is the first study that addresses the issue of censoring in estimating the effects of Bt corn adoption at the farm in a developing country context. We show that Bt corn adoption provides modest but statistically significant increases in farm yields and profits. Furthermore, our results provide some evidence of inference errors that can potentially arise when censoring in the pesticide Application Variable is ignored in the estimation procedures.
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Farm Level Impacts of Bt Corn Adoption in a Developing Country: Evidence from the Philippines
2007Co-Authors: Maria Erlinda M. Mutuc, Roderick M. Rejesus, M.Abstract:This article examines the ex post farm-level impacts of Bt corn adoption in the Philippines. Using an econometric approach that addresses simultaneity, selection, and censoring problems, we show that Bt corn adoption provides modest but statistically significant increases in farm-level yields and profits. Furthermore, our results suggest that farm-level yield and profit impacts of Bt corn adoption are underestimated when censoring in the pesticide Application Variable is not considered in the estimation procedures. Previous literature have emphasized the importance of simultaneity and selection problems but this is the first study that have raised the issue of censoring problems in estimating the farm-level effects of Bt corn adoption.
M. - One of the best experts on this subject based on the ideXlab platform.
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Farm Level Impacts of Bt Corn Adoption in a Developing Country: Evidence from the Philippines
2007Co-Authors: Maria Erlinda M. Mutuc, Roderick M. Rejesus, M.Abstract:This article examines the ex post farm-level impacts of Bt corn adoption in the Philippines. Using an econometric approach that addresses simultaneity, selection, and censoring problems, we show that Bt corn adoption provides modest but statistically significant increases in farm-level yields and profits. Furthermore, our results suggest that farm-level yield and profit impacts of Bt corn adoption are underestimated when censoring in the pesticide Application Variable is not considered in the estimation procedures. Previous literature have emphasized the importance of simultaneity and selection problems but this is the first study that have raised the issue of censoring problems in estimating the farm-level effects of Bt corn adoption.
Roderick M. Rejesus - One of the best experts on this subject based on the ideXlab platform.
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Impact Assessment of Bt Corn Adoption in the Philippines
Journal of Agricultural and Applied Economics, 2012Co-Authors: Maria Erlinda M. Mutuc, Roderick M. Rejesus, Jose M. YorobeAbstract:This article examines the impact of Bt corn adoption in the Philippines using an econometric approach that addresses simultaneity, selection, and censoring problems. Although previous literature emphasizes the importance of simultaneity and selection problems, this is the first study that addresses the issue of censoring in estimating the effects of Bt corn adoption at the farm in a developing country context. We show that Bt corn adoption provides modest but statistically significant increases in farm yields and profits. Furthermore, our results provide some evidence of inference errors that can potentially arise when censoring in the pesticide Application Variable is ignored in the estimation procedures.
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Farm Level Impacts of Bt Corn Adoption in a Developing Country: Evidence from the Philippines
2007Co-Authors: Maria Erlinda M. Mutuc, Roderick M. Rejesus, M.Abstract:This article examines the ex post farm-level impacts of Bt corn adoption in the Philippines. Using an econometric approach that addresses simultaneity, selection, and censoring problems, we show that Bt corn adoption provides modest but statistically significant increases in farm-level yields and profits. Furthermore, our results suggest that farm-level yield and profit impacts of Bt corn adoption are underestimated when censoring in the pesticide Application Variable is not considered in the estimation procedures. Previous literature have emphasized the importance of simultaneity and selection problems but this is the first study that have raised the issue of censoring problems in estimating the farm-level effects of Bt corn adoption.
Jose M. Yorobe - One of the best experts on this subject based on the ideXlab platform.
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Impact Assessment of Bt Corn Adoption in the Philippines
Journal of Agricultural and Applied Economics, 2012Co-Authors: Maria Erlinda M. Mutuc, Roderick M. Rejesus, Jose M. YorobeAbstract:This article examines the impact of Bt corn adoption in the Philippines using an econometric approach that addresses simultaneity, selection, and censoring problems. Although previous literature emphasizes the importance of simultaneity and selection problems, this is the first study that addresses the issue of censoring in estimating the effects of Bt corn adoption at the farm in a developing country context. We show that Bt corn adoption provides modest but statistically significant increases in farm yields and profits. Furthermore, our results provide some evidence of inference errors that can potentially arise when censoring in the pesticide Application Variable is ignored in the estimation procedures.
