The Experts below are selected from a list of 188388 Experts worldwide ranked by ideXlab platform
Richard James Crossley - One of the best experts on this subject based on the ideXlab platform.
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Wind Turbine blade design
Energies, 2012Co-Authors: Peter J. Schubel, Richard James CrossleyAbstract:A detailed review of the current state-of-art for Wind Turbine blade design is presented, including theoretical maximum efficiency, propulsion, practical efficiency, HAWT blade design, and blade loads. The review provides a complete picture of Wind Turbine blade design and shows the dominance of modern Turbines almost exclusive use of horizontal axis rotors. The aerodynamic design principles for a modern Wind Turbine blade are detailed, including blade plan shape/quantity, aerofoil selection and optimal attack angles. A detailed review of design loads on Wind Turbine blades is offered, describing aerodynamic, gravitational, centrifugal, gyroscopic and operational conditions.
Peter J. Schubel - One of the best experts on this subject based on the ideXlab platform.
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Wind Turbine blade design
Energies, 2012Co-Authors: Peter J. Schubel, Richard James CrossleyAbstract:A detailed review of the current state-of-art for Wind Turbine blade design is presented, including theoretical maximum efficiency, propulsion, practical efficiency, HAWT blade design, and blade loads. The review provides a complete picture of Wind Turbine blade design and shows the dominance of modern Turbines almost exclusive use of horizontal axis rotors. The aerodynamic design principles for a modern Wind Turbine blade are detailed, including blade plan shape/quantity, aerofoil selection and optimal attack angles. A detailed review of design loads on Wind Turbine blades is offered, describing aerodynamic, gravitational, centrifugal, gyroscopic and operational conditions.
Dongmei Chen - One of the best experts on this subject based on the ideXlab platform.
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Stability of Wind Turbine switching control in an integrated Wind Turbine and rechargeable battery system: A common quadratic lyapunov function approach
Journal of Dynamic Systems Measurement and Control-transactions of The Asme, 2013Co-Authors: Dushyant Palejiya, Christine A. Mecklenborg, John F. Hall, Dongmei ChenAbstract:The power generated by Wind Turbines varies due to variations in the Wind speed. A pack of rechargeable batteries could be used as a reserve power source to alleviate the intermittency in the Wind Turbine power. An integrated Wind Turbine and battery storage system is constructed where the Wind Turbine is electrically connected to a rechargeable battery system. Such a system can operate in two modes depending on the Wind speed, power demand, and battery limit. The switching conditions for the Wind Turbine to operate in multi-input, single-output and single-input, single-output control mode are discussed. Linearized approximations of the closed loop Wind Turbine system are derived in order to analyze the switching stability between control modes. Common quadratic Lyapunov function (CQLF) is established for both control modes to prove the system stability. Simulation results demonstrating system stability are also presented.
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Mode changing stability of Wind Turbine in an integrated Wind Turbine and rechargeable battery system
Proceedings of the 2011 American Control Conference, 2011Co-Authors: Christine A. Mecklenborg, Dushyant Palejiya, John F. Hall, Dongmei ChenAbstract:Power generated by Wind Turbines changes due to variation in Wind speed that is independent of the load power. Rechargeable batteries could be used as a reserve power source to alleviate unbalance between the load power and power generated by Wind Turbines. A supervisory controller is proposed for an integrated Wind Turbine-battery system (Wind Turbine electrically connected to a rechargeable battery). The switching conditions for Wind Turbine controller operating in multi-input and single-input control modes are discussed. Stability of the Wind Turbine controller switching between the two modes is analyzed using linearized, open-loop approximation of Wind Turbine dynamics at the switching instants. A Common Quadratic Lyapunov Function (CQLF) is established for both control modes to prove the system stability. Simulation results demonstrating system stability are also discussed.
Sin Chew Poh - One of the best experts on this subject based on the ideXlab platform.
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Cross axis Wind Turbine: Pushing the limit of Wind Turbine technology with complementary design
Applied Energy, 2017Co-Authors: Wen Tong Chong, Kok Hoe Wong, Mohammed Gwani, Yung Jeh Chu, Wan Khairul Muzammil, Chin-tsan Wang, Sin Chew PohAbstract:In unfavourable Wind conditions, factors such as low Wind speed, high turbulence, and constant Wind direction change can reduce the power production of a horizontal axis Wind Turbine. Certain vertical axis Wind Turbine design principles perform well under these harsh operating conditions; but, these Wind rotors typically have low power coefficients. To overcome the problems above, a novel cross axis Wind Turbine has been conceptualised to maximise Wind energy generation. This is achieved via harnessing the Wind energy from both the horizontal and vertical components of the oncoming Wind. The cross axis Wind Turbine comprises three vertical blades and six horizontal blades arranged in a cross axis orientation. Initial testing using deflectors to guide the oncoming airflow upward showed that the cross axis Wind Turbine produced significant improvements in power output and rotational speed performance compared to a conventional straight-bladed vertical axis Wind Turbine. In particular, it was found that the cross axis Wind Turbine integrated with a 45° deflector produced a power coefficient 2.8 times higher than the vertical axis Wind Turbine. The rotor rotational speed was increased by 70% with well-improved starting behaviour. Initial computational fluid dynamics analysis was done to illustrate the flow field of the deflected air stream by an omni-directional shroud. The simulation showed that the approaching air is deflected upwards by the guide-vane, which would interact with the horizontal blades and produce additional torque. The cross axis Wind Turbine is applicable in many locations, creating significant opportunities for Wind energy devices and therefore reducing dependencies on fossil fuel.
Eduard Muljadi - One of the best experts on this subject based on the ideXlab platform.
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Model validation for Wind Turbine generator models
IEEE Transactions on Power Systems, 2011Co-Authors: Mohamed Asmine, Jacques Brochu, Yuriy Kazachkov, Charles Eric Langlois, Christian Larose, Jason Macdowell, Richard Gagnon, Eduard Muljadi, J Fortmann, Pouyan PourbeikAbstract:This paper summarizes the work of the Ad Hoc Task Force on Wind Generation Model Validation. The paper describes the concept of model validation, how this applies to Wind Turbine generation systems, and then gives clear examples of the most recent efforts to achieve model validation for Wind Turbine power plants. The document ends with a summary of the learning from the work presented and the conclusions which can be derived. Recommendations are made on the path forward for Wind Turbine generator modeling and model validation, primarily focused on generic models (i.e., standardized and publicly available) for stability analysis in power system studies.
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pitch controlled variable speed Wind Turbine generation
IEEE Industry Applications Society Annual Meeting, 1999Co-Authors: Eduard Muljadi, C P ButterfieldAbstract:Wind energy is a viable option to complement other types of pollution-free generation. In the early development of Wind energy, the majority of Wind Turbines were operated at constant speed. Recently, the number of variable-speed Wind Turbines installed in Wind farms has increased and more Wind Turbine manufacturers are making variable-speed Wind Turbines. This paper covers the operation of variable-speed Wind Turbines with pitch control. The system the authors considered is controlled to generate maximum energy while minimizing loads. The maximization of energy was only carried out on a static basis and only drive train loads were considered as a constraint. In medium Wind speeds, the generator and power converter control the Wind Turbine to capture maximum energy from the Wind. In the high Wind speed region, the Wind Turbine is controlled to maintain the aerodynamic power produced by the Wind Turbine. Two methods to adjust the aerodynamic power were investigated: pitch control and generator load control, both of which are employed to control the operation of the Wind Turbine. The authors analysis and simulation shows that the Wind Turbine can be operated at its optimum energy capture while minimizing the load on the Wind Turbine for a wide range of Wind speeds.
