The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform
Stephanie Eugenia Ordonez Sanchez - One of the best experts on this subject based on the ideXlab platform.
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A contra-Rotating marine current turbine on a flexible mooring : development of a scaled prototype
2008Co-Authors: Joseph Andrew Clarke, Cameron Johnstone, Gary Connor, Andrew Grant, Stephanie Eugenia Ordonez SanchezAbstract:The contra-Rotating marine current turbine concept developed by the Energy Systems Research Unit at the University of Strathclyde is aimed at extracting energy in a wide range of water depths by 'flying' a neutrally-buoyant device from a flexible, tensioned mooring. After successful proof of concept turbine trials, the development programme has moved on to investigate the performance of a scaled prototype of the complete system incorporating the turbine, submersible contra-Rotating Generator and mooring. The turbine/Generator assembly has been tested in a towing tank, and the entire system is now undergoing sea trials. An investigation into turbine wake development (an area in which it is hoped that the contra-Rotating turbine will have uniquely beneficial properties) has recently begun. Small single-rotor model turbines have been deployed in a flume. Trends observed so far are in accordance with those observed by other researchers.
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Contra-Rotating marine current turbines: performance in field trials and power train developments
2008Co-Authors: Joseph Andrew Clarke, Cameron Johnstone, Gary Connor, Andrew Grant, Stephanie Eugenia Ordonez SanchezAbstract:Development of a novel contra-Rotating marine current turbine has been continuing at the University of Strathclyde. Continuous monitoring of blade bending loads during trials has enabled an investigation of blade-blade and blade-structure interactions. The former are a particular concern with a contra-Rotating turbine, but there is now evidence to suggest that in normal operation these are relatively small. By contrast, blade-structure effects are clearly visible. A turbine complete with single-point mooring and submersible contra-Rotating Generator is presently being prepared for sea trials. Details of the machine and the test programme are described.
Kwang Y. Lee - One of the best experts on this subject based on the ideXlab platform.
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Data-driven modelling of a doubly fed induction Generator wind turbine system based on neural networks
IET Renewable Power Generation, 2014Co-Authors: Xiaobing Kong, Xiangjie Liu, Kwang Y. LeeAbstract:In a wind power system, the wind turbine captures wind energy and converts it into electric energy through a coupled Rotating Generator. This renewable energy conversion system usually consists of a wind turbine, rotor, gearbox and mostly a doubly fed induction Generator (DFIG). It is a complex non-linear multi-input multi-output system with many uncertain factors. Meanwhile, the dynamics of the system is quite dependent on the wind velocity. Traditional analytical methods are quite difficult to model such a complex system. The recently developed data-driven method can be a suitable modelling technique for such system. Using a large amount of input–output on-line measurement data from the selected months, neural networks and neuro-fuzzy networks are fully utilised to model the DFIG. Detailed analysis and comparisons with the classical system identification techniques are addressed to show the advantages of the data-driven DFIG modelling approach.
Nadia Cretescu - One of the best experts on this subject based on the ideXlab platform.
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Efficiency Analysis of a Planetary Speed Increaser for Wind Turbines with Counter-Rotating Versus Fixed-Stator Electric Generator
2020 7th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE), 2020Co-Authors: Mircea Neagoe, Radu Saulescu, Codruta Jaliu, Nadia CretescuAbstract:The paper presents a comparative study of the efficiency of a planetary speed increaser with spur gears used in wind turbines with one rotor and a counter-Rotating electric Generator compared to the conventional case (Generator with fixed stator). Based on a generalized algorithm proposed for the kinematic and static modelling of the speed increaser with one input and two outputs, the efficiency is obtained for both cases of power flow transmission: branching on two outputs and without branching (one output). The numerical simulation of the analytical results highlights the higher efficiency of two-output speed increaser from wind turbines with counter-Rotating Generator compared to the case with one output.
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Performance analysis of a novel planetary speed increaser used in single-rotor wind turbines with counter-Rotating electric Generator
IOP Conference Series: Materials Science and Engineering, 2016Co-Authors: Radu Saulescu, Mircea Neagoe, Olimpiu Munteanu, Nadia CretescuAbstract:The paper presents a study on the kinematic and static performances of a new type of 1DOF (Degree Of Freedom) planetary speed increaser to be implemented in wind turbines, a transmission with three operating cases: a) one input and one output, b) one input and two outputs, in which the speed of the secondary output is equal to the input speed, and c) with one input and two outputs, where the secondary output speed is higher than the input speed. The proposed speed increaser contains two sun gears and a double satellite, allowing operation with an output connected to the fixed stator of a classic Generator (case I) or with two counterRotating outputs that drive a counter-Rotating Generator (with a mobile stator). A new variant of planetary transmission capable of providing the speed increase of the Generator stator and, thus, the increase of the relative speed between the Generator rotor and stator is obtained by the parallel connection of the speed increaser with a planetary gear. The three conceptual variants of planetary transmission are analytically modelled and comparatively analysed based on a set of kinematic and static parameters. The proposed transmission has higher performances compared to the same transmission with one input and one output, the increase of the kinematic amplification ratio and efficiency being achieved simultaneously.
Cameron Johnstone - One of the best experts on this subject based on the ideXlab platform.
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Integration of a direct drive contra-Rotating Generator with point absorber wave energy converters
2017Co-Authors: Kate Porter, Stephanie Ordonez-sanchez, Cameron Johnstone, Stephanie ConesaAbstract:Wave energy converters (WECs) produce reciprocal motion which requires a complex power transfer and take‐off system to generate the rotary motion necessary to drive an electrical Generator. These systems are often expensive and unreliable, and can introduce considerable power losses reducing the efficiency of the device. This study investigates the application of a direct drive contra-Rotating Generator (DD-CRG), originally designed for the tidal energy industry, to a generic point absorber wave energy converter. The contra-rotation of the Generator facilitates lower torque and higher speed inputs compared to a conventional direct drive Generator, reducing the size, weight and cost of the power take-off system. It was found that the existing Generator design was technically and physically compatible with the point absorber device. Furthermore the wave energy application enabled optimisation of the Generator design to increase the Generator speed and further reduce the applied torque. This led to a significant reduction in the levelised cost of energy of at least 20% compared to using a conventional hydraulic drivetrain in the same device. Adoption of the DD-CRG within the wave sector would bring additional benefits due to its tailored design for the marine environment, and further cost reductions could be realised through the increase in manufacturing volume.
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A contra-Rotating marine current turbine on a flexible mooring : development of a scaled prototype
2008Co-Authors: Joseph Andrew Clarke, Cameron Johnstone, Gary Connor, Andrew Grant, Stephanie Eugenia Ordonez SanchezAbstract:The contra-Rotating marine current turbine concept developed by the Energy Systems Research Unit at the University of Strathclyde is aimed at extracting energy in a wide range of water depths by 'flying' a neutrally-buoyant device from a flexible, tensioned mooring. After successful proof of concept turbine trials, the development programme has moved on to investigate the performance of a scaled prototype of the complete system incorporating the turbine, submersible contra-Rotating Generator and mooring. The turbine/Generator assembly has been tested in a towing tank, and the entire system is now undergoing sea trials. An investigation into turbine wake development (an area in which it is hoped that the contra-Rotating turbine will have uniquely beneficial properties) has recently begun. Small single-rotor model turbines have been deployed in a flume. Trends observed so far are in accordance with those observed by other researchers.
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Contra-Rotating marine current turbines: performance in field trials and power train developments
2008Co-Authors: Joseph Andrew Clarke, Cameron Johnstone, Gary Connor, Andrew Grant, Stephanie Eugenia Ordonez SanchezAbstract:Development of a novel contra-Rotating marine current turbine has been continuing at the University of Strathclyde. Continuous monitoring of blade bending loads during trials has enabled an investigation of blade-blade and blade-structure interactions. The former are a particular concern with a contra-Rotating turbine, but there is now evidence to suggest that in normal operation these are relatively small. By contrast, blade-structure effects are clearly visible. A turbine complete with single-point mooring and submersible contra-Rotating Generator is presently being prepared for sea trials. Details of the machine and the test programme are described.
Keiichi Yoshino - One of the best experts on this subject based on the ideXlab platform.
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Tidal Power Generation System with Counter-Rotating
Journal of the Institute of Industrial Applications Engineers, 2014Co-Authors: Koji Masuda, Keiichi Yoshino, Mitsuru SoedaAbstract:This paper describes a tidal power generation system with counter-Rotating Generator. The method of charging is charging current control. The demonstration experiment was conducted by the method using counter-Rotating Generator and the usual method at Kanmon Straits. They realized following maximum efficiency. However the mechanical loss of the Generator’s stator was 3 times larger than rotor loss. Also, in counter-Rotating, the stator loss was about 2.5 times the usual. Therefore in order to increase the power generation capacity, selecting a Generator that the stator loss is smaller is important in counter-Rotating.
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Tidal Power Generation with Counter-Rotating Generator
Proceedings of The 2nd International Conference on Intelligent Systems and Image Processing 2014, 2014Co-Authors: Koji Masuda, Keiichi YoshinoAbstract:This paper describes a tidal power generation system with counter-Rotating Generator. The method of charging is charging current control. The demonstration experiment was conducted by the method using counter-Rotating Generator and the usual method at Kanmon Straits. They showed both equivalent charging power. However the mechanical loss of the Generator’s stator had more than twice in this Generator. Therefore the power generation capacity increases by selecting Generator that the stator loss is smaller.
