The Experts below are selected from a list of 108582 Experts worldwide ranked by ideXlab platform
Hideomi Sekine - One of the best experts on this subject based on the ideXlab platform.
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Wind Velocity and rotor position sensorless maximum power point tracking control for Wind generation system
Renewable Energy, 2006Co-Authors: Tomonobu Senjyu, Endusa Billy Muhando, Naomitsu Urasaki, Toshihisa Funabashi, Satoshi Tamaki, Hiroshi Kinjo, Hideki Fujita, Hideomi SekineAbstract:In order to perform maximum power point tracking control of Wind generation system, it is necessary to drive Windmill at an optimal rotor speed. For that purpose, a rotor position and a Wind Velocity sensors become indispensable. However, from the aspect of reliability and increase in cost, rotor position sensor and Wind Velocity sensor are not usually preferred. Hence, Wind Velocity and position sensorless operating method for Wind generation system using observer is proposed in this paper. Moreover, improving the efficiency of the permanent magnet synchronous generator is also performed by optimizing d-axis current using the Powell method.
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Wind Velocity and rotor position sensorless maximum power point tracking control for Wind generation system
Power Electronics Specialists Conference, 2004Co-Authors: Tomonobu Senjyu, Naomitsu Urasaki, Toshihisa Funabashi, Satoshi Tamaki, Hideki Fujita, K Uezato, H Higa, Hideomi SekineAbstract:In order to perform maximum power point tracking control of Wind power generation system, it is necessary to drive Windmill at an optimal rotor speed. For that purpose, a rotor position and a Wind Velocity sensors become indispensable. However, from the aspect of reliability and increase in cost, rotor position sensor and Wind Velocity sensor are not usually preferred. Hence, Wind Velocity and position sensorless operating method for Wind power generation system using observer is proposed in this paper. Moreover, improving the efficiency of the permanent magnet synchronous generator is also performed by optimizing d-axis current using the Powell method.
Ben S Nasrallah - One of the best experts on this subject based on the ideXlab platform.
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an experimental study of a plasma actuator in absence of free airflow ionic Wind Velocity profile
Physics of Plasmas, 2010Co-Authors: Rafika Mestiri, Ramzi Hadaji, Ben S NasrallahAbstract:In this study, we are interested in the direct current electrical corona discharge created between two wire electrodes. The experimental results are related to some electroaerodynamic actuators based on the direct current corona discharge at the surface of a dielectric material. Several geometrical forms are selected for the dielectric surface, such as a plate, a cylinder, and a NACA 0015 aircraft wing. The current density-electric field characteristics are presented for different cases in order to determine the discharge regimes. The corona discharge produces nonthermal plasma, so it is called plasma discharge. Plasma discharge creates a tangential ionic Wind above the surface at the vicinity of the wall. The ionic Wind induced by the corona discharge is measured in absence of free external airflow. The ionic Wind Velocity profiles and the maximum induced tangential force are given for different surface forms, so it is possible to compare the actuators effect based on the span of the ionic Wind Velocity and thrust values. The higher ionic Wind Velocity is obtained with the NACA profile, which shows the effectiveness of this actuator for the airflow control.
Shizhong Qiang - One of the best experts on this subject based on the ideXlab platform.
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simplifying the simulation of stochastic Wind Velocity fields for long cable stayed bridges
Computers & Structures, 2004Co-Authors: Hai Li Liao, Shizhong QiangAbstract:The spectral representation method has been greatly developed as the performance of computer was enhanced. For the time-domain analysis of long cable-stayed bridge, it is required to simulate Wind Velocity histories at many points arranged on the overall bridge. However, the number of these points is usually so large that the spectral representation method obviously becomes computationally prohibitive. In this paper, a practical method is introduced to simplify stochastic Wind Velocity field for long cable-stayed bridges. According to the properties of both the structural type and the vibration mode of long cable-stayed bridge, and considering the correlation characteristics of natural Wind, an overall three-dimensional (i.e. three components of natural Wind) Wind Velocity field of a long cable-stayed bridge can be simplified into many one-dimensional (i.e. just one component) Wind Velocity fields, respectively, along pylons and deck. The Wind fluctuation along each pylon can be simulated independently by omitting the Wind Velocity correlation between one pylon and another. Using the explicitly expressed Cholesky's decomposition of the cross-spectral density matrix, the Wind Velocity field along the deck can be simulated relatively fast. The FFT (Fast Fourier Transform) technique is adopted to further improve the computational efficiency. As an example, the stochastic Wind field of a three-pylon cable-stayed bridge is simulated. The spectrum and correlation characteristics of the simulated samples are checked, which demonstrates that the simulation results agree with the corresponding targets.
Tomonobu Senjyu - One of the best experts on this subject based on the ideXlab platform.
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Wind Velocity and rotor position sensorless maximum power point tracking control for Wind generation system
Renewable Energy, 2006Co-Authors: Tomonobu Senjyu, Endusa Billy Muhando, Naomitsu Urasaki, Toshihisa Funabashi, Satoshi Tamaki, Hiroshi Kinjo, Hideki Fujita, Hideomi SekineAbstract:In order to perform maximum power point tracking control of Wind generation system, it is necessary to drive Windmill at an optimal rotor speed. For that purpose, a rotor position and a Wind Velocity sensors become indispensable. However, from the aspect of reliability and increase in cost, rotor position sensor and Wind Velocity sensor are not usually preferred. Hence, Wind Velocity and position sensorless operating method for Wind generation system using observer is proposed in this paper. Moreover, improving the efficiency of the permanent magnet synchronous generator is also performed by optimizing d-axis current using the Powell method.
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Wind Velocity and rotor position sensorless maximum power point tracking control for Wind generation system
Power Electronics Specialists Conference, 2004Co-Authors: Tomonobu Senjyu, Naomitsu Urasaki, Toshihisa Funabashi, Satoshi Tamaki, Hideki Fujita, K Uezato, H Higa, Hideomi SekineAbstract:In order to perform maximum power point tracking control of Wind power generation system, it is necessary to drive Windmill at an optimal rotor speed. For that purpose, a rotor position and a Wind Velocity sensors become indispensable. However, from the aspect of reliability and increase in cost, rotor position sensor and Wind Velocity sensor are not usually preferred. Hence, Wind Velocity and position sensorless operating method for Wind power generation system using observer is proposed in this paper. Moreover, improving the efficiency of the permanent magnet synchronous generator is also performed by optimizing d-axis current using the Powell method.
Rafika Mestiri - One of the best experts on this subject based on the ideXlab platform.
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an experimental study of a plasma actuator in absence of free airflow ionic Wind Velocity profile
Physics of Plasmas, 2010Co-Authors: Rafika Mestiri, Ramzi Hadaji, Ben S NasrallahAbstract:In this study, we are interested in the direct current electrical corona discharge created between two wire electrodes. The experimental results are related to some electroaerodynamic actuators based on the direct current corona discharge at the surface of a dielectric material. Several geometrical forms are selected for the dielectric surface, such as a plate, a cylinder, and a NACA 0015 aircraft wing. The current density-electric field characteristics are presented for different cases in order to determine the discharge regimes. The corona discharge produces nonthermal plasma, so it is called plasma discharge. Plasma discharge creates a tangential ionic Wind above the surface at the vicinity of the wall. The ionic Wind induced by the corona discharge is measured in absence of free external airflow. The ionic Wind Velocity profiles and the maximum induced tangential force are given for different surface forms, so it is possible to compare the actuators effect based on the span of the ionic Wind Velocity and thrust values. The higher ionic Wind Velocity is obtained with the NACA profile, which shows the effectiveness of this actuator for the airflow control.
